2nd Warmest September

Now that we have today’s high and low temperature in, we can confidently say the average temperature will be 67.4 degrees, which just barely edges out 1991 to make September 2011 the 2nd warmest on record here in Portland.  Even more interesting was the average high of 79 degrees, which was warmer than July’s average!  That shows (once again) how chilly the first half of summer was.  That 79 is not in the top 5 though.  We’ve had several other Septembers with the average high temperature around 80, but the lows were cooler.  So the unusually warm nights really did it this time around.

Chief Meteorologist Mark Nelsen

121 Responses to 2nd Warmest September

  1. pappoose in scappoose says:

    National Weather Service Portland or
    854 am PDT Monday Oct 3 2011

    Lowering snow levels, Stray Albino Donkeys wandering about.

    Short term…a frontal system is near the Washington and Oregon coast at 9am and moving slowly east. The upper dynamics are weakening as the energy splits north and south. There has been some active convection over the coastal waters which is pushing into the southern Washington coastline this morning. The front appears to have a double structure with a band of showers right along the coast and another band over the offshore waters at 9am. Isolated thunderstorms are possible in these bands. The front will move inland slowly today which will maintain light rain across the Willamette Valley and mountains…and showers along the coast. Dual-pol radar data shows snow level over the Cascades is about 63oo feet. The snow level is a little lower to the northwest over extreme southwest Washington but well above the terrain. Front will reach the Willamette Valley later this afternoon and be followed by showers tonight. Will keep mention of thunderstorms for the coast this afternoon and early evening in the moderately unstable air mass.

    orangered, orangered, orangered…

  2. umpire says:

    hot pink, hot pink, hot pink . . .

  3. PaulB/Eugene says:

    Long range update:
    ECMWF and GFS both show g of AK ridging and trough over interior NW USA between days 10-15, with a little support from Gfs and Canadian ensembles. Would not call this an arctic blast if it happens….just Molson light with frost

    • Punxsutawney (aka HIOPHIL) at work by Sunset High elev ~280' says:

      06z GFS looks much wetter in the long range (10-15) days than the 00z. And pretty cool temps as mentioned.

  4. Might as well be December…54, rain and a little wind 🙂

    0.16″ so far

  5. Kyle says:

    In tghe winter the 40mph winds would be no sweat but this time of year trees are still fully loaded with heavy weighing leaves and if it rains hard will add to the collection leaving behind a trail of very messy yards and clogged drains.

    I wonder if schools close as a resullt of too many leaves on the road? 😉

  6. Yevpolo1990 says:

    We need those cinnamon rolls to roll through SW WA!

  7. Jbpdx says:

    So looks like after one month with above average temps we’re right back to below average. Unless something changes by mid month, no Indian summer. And I can hear the wine grapes splitting and rotting…. Oh well, Oregon’s economy can handle a billion-dollar hit.

    • Ryan (Walnut Grove) says:

      If your industry banks on an Indian Summer you are in the wrong climate for your industry.

      That being said the fall weather has arrived early this year.

    • I keep remembering 1998. That year where we waited and waited annnnnnnnnnnnnd waited to hit freezing. It finally went below freezing in December 18th. Two days later the HIGH was just 27 and lows dipped into the single digits.

      I guess we just never know.

    • Punxsutawney (aka HIOPHIL) at work by Sunset High elev ~280' says:

      They were harvesting grapes out around Banks on Saturday, so not all is lost.

  8. bgb41 says:

    10/2/2011 Oregon (All) Temperature Summary

    High:82 at LAKE OWHEE AND O(2400 ft)
    Low: 56 at DW2682 Portland(213 ft) & 8 other locations in W. Oregon

    High:45 at CRATER LAKE RIM(7050 ft)
    Low: 24 at CABIN LAKE (4560 ft ) & KLAMATH NWR (4531 ft )

    Largest Diurnal Change: 40 degrees
    North Powder (I- (75/35 ) (3273 ft )
    CABIN LAKE (64/24) (4560 ft)

    Heaviest Rainfall:
    1.57″ at QUAIL PRAIRIE LO(3183ft)
    1.17″ at RED MOUND(1753ft)
    1.14″ at BALD KNOB(3630ft)

  9. bgb41 says:

    Here are some totals for the 2010-2011 water year which ended on September 30th. Green shaded cities were above normal and brown were below normal.

  10. bgb41 says:

    00Z GFS @ KTTD is much drier now than previous runs. Its also suggesting a possible early season frost/freeze in areas away from town. This is way out at the end of the run. Last year we did not freeze till well into November most places.

  11. jesse3784 says:

    when is the first snow going to happen in the passes

  12. pappoose in scappoose says:

    I’m really glad the NWS tells us which models are in agreement (don’t you just hate the constant bickering that goes on).

    National Weather Service Portland or
    210 PM PDT sun Oct 2 2011

    One disturbance may move by around Friday and one late
    in the weekend…though there is some discrepancies in the models. The European model (ecmwf) and the Canadian show the most agreement. Tolleson

  13. Would love to see something more organized come in. Light rain off and on here and 57 degrees. 0.08″ so far today.

  14. Austin (Cornelius) says:

    buoy46005 recorded winds of 31 mph (sustained).
    along with 9 lightning strikes over seas as of 7:55 pm.
    what is it doing? weakening or strengthening? i need answers!
    is it going to be a bust?

  15. Farmer Steve says:

    Does anybody know what the water year total for Hillsboro is and where to find it ?

  16. PaulB/Eugene says:

    It is highly recommended that we all review the watch/warning color wheel for upcoming fall/winter.


  17. Timmy_Supercell (Klamath Falls @ 4200') says:

    Here is part of the special weather statement:

    “Gusty winds are also expected Tuesday. The strongest winds will occur at the coast… over the mountains and east of the Cascades. Southerly winds gusting to around 40 mph and locally up to 60 mph are possible.”

    So we will have some windstorm in a few areas but not the valleys

    • SilentReader says:

      40-60mph is not a wind storm for the coast. That is just a nice gentle breeze for the folks native or living there for a while. I grew up on the coast and unless it was 80+ we rarely gave it notice..

    • Timmy_Supercell (Klamath Falls @ 4200') says:

      Windstorm for here, because I’m at the Cascade mountains. I know coastal areas get that 1000 times a year, LOL but thats not the case here in my location.

    • SilentReader says:

      I hear ya. funny how many times we would hear about 30-40mph winds in the valley and how big of a deal it was while living at the coast. yet the coastal 80+ mph winds rarely get mentioned. and 60+ are really common. Although they were a blast. Was not around the Columbus day storm but did witness, what my family calls, the Friday The 13th storm. I believe it was sometime in 83-86 time frame. It was a hell of a storm and left us with out power, Lincoln City, for about 4 days. Winds in various local spots were over 100mph (gusts of course). That was something. What also helped with the drama was that we lived in a small metal mobile home at the time. The roof would roll like thunder and the entire frame would shake. I was afraid that being “Mobile” meant we would soon be airborne..

      To be honest I don’t recall a 40mph wind ever doing anything harmful. I guess if you have a loose branch it could cause a power flicker 🙂

      It is all relative and also what you have around you when the wind hits. Trees do tend to make wind events sound stronger because of the whooshing. Trees actually allow you to hear the gusts ramps up. although , I am sure, that actual affect on the wind is lessened by having the trees around.

      sorry about the rambling . just that talking about storms and wind has made my mind wonder about the storms and watching the barometer drop like a rock. My sister, mom and I huddled up in the living room, in candle-light waiting for the next whoosh.

  18. Andrew Johnson says:

    I had a high/low of 58.6/52.7 yesterday and picked up .35″ of rain overnight. Had a morning low today of 53.1.

  19. Timmy_Supercell (Klamath Falls @ 4200') says:

    Melbourne, FL just had a record low of 58F…..

    Wait, 58F! thats still warm, ya know 🙂 I don’t think I’d last in an area like that. No thanks I’m fine in Oregon.

  20. Timmy_Supercell (Klamath Falls @ 4200') says:

    Nice view of the upcoming storm that will be bringing us all the rain/muck/mess or whatever you wanna call it 🙂

  21. bgb41 says:

    10/1/2011 Oregon (All) Temperature Summary

    High:89 at ALKALI FLAT(2495 ft)
    Low: 64 at ALKALI FLAT(2495 ft) & BULLY CREEK RESE(2500 ft)

    High:49 at BLAZED ALDER(3650 ft) & NORTH FORK(3120 ft) & WANDERER’S PEAK(4350 ft) & HOLLAND MEADOWS(4900 ft) & SWAN LAKE MTN(6800 ft)
    Low: 32 at CABIN LAKE (4560 ft )

    Largest Diurnal Change: 37 degrees
    CROW FLAT (76/39 ) (5130 ft )

    Heaviest Rainfall:
    1.34″ at RED MOUND(1753ft)
    1.10″ at DUNES(120ft)
    1.06″ at Brookings Airpor(459ft)
    0.88″ at QUAIL PRAIRIE LO(3183ft)

  22. Just 0.02″ so far here. High was only 63 today.

  23. Boydo3 N. Albany 500' says:

    Picked up about .22 in. in the last two hours here.

  24. bgb41 says:

    Portland Airport had a 4 degree diurnal change today as of 6pm.
    The last time they had a diurnal change of 5 degrees or less was on March 16, 2011 when there was a High 44 Low 41.

  25. Garron says:

    That was a close one! One degree over 1991’s total. Thanks Mark and BGB for all the stats! I still have tomatoes trying to ripen, so the weak ridge later in the week will be welcome news, got them covered in plastic till Wed. I’ve still got squash and peppers coming out of my ears. If the last two summers taught me anything, it’s that the greenhouse I am building for next year will be WELL worth the money.

    • Jesse-Orchards says:

      I wouldn’t expect your tomatoes to ripen any more beyond where they are now. Even if it does dry out a bit later next week it will still only be in the 60s. It’s October.

    • Boydo3 N. Albany 500' says:

      Garron has a great idea with the plastic. He’ll get tomatoes to ripen for quite some time. I’ve gotten them all the way to Thanksgiving under plastic. Just got to watch the ventilation.

    • bgb41 says:

      I picked most of mine today.

    • Garron says:

      I’ve had ripe tomatoes as late as the 1st week of November. As long as I move the plants close to the house to shield them from the low temps at night, they will continue to ripen, even as the foliage is dying off.

  26. http://classic.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KORPORTL110

    Averages\Extremes for the month of September 2011

    Average temperature = 66.7°F (Highest average temp for September)
    Average humidity = 59%
    Average dewpoint = 49.1°F
    Average barometer = 30.003 in. (Highest average barometer for September)
    Average windspeed = 2.2 mph
    Average gustspeed = 3.1 mph
    Average direction = 351° ( N )
    Rainfall for month = 0.713 in. (Driest September on record) (Average is 1.53”)
    Rainfall for year = 27.461 in. (Highest rainfall for the year at this time on record)
    Maximum rain per minute = 0.081 in on day 18 at time 03:40
    Maximum temperature = 95.0°F on day 07 at time 17:17 (Highest max temp for September)
    Minimum temperature = 45.0°F on day 28 at time 05:26 (Lowest temp for September on record)
    Maximum humidity = 100% on day 28 at time 10:46
    Minimum humidity = 18% on day 06 at time 17:21
    Maximum dewpoint = 62.8°F on day 24 at time 03:45
    Minimum dewpoint = 29.8°F on day 28 at time 20:07
    Maximum pressure = 30.37 in. on day 28 at time 05:19
    Minimum pressure = 29.54 in. on day 24 at time 20:20
    Maximum windspeed = 11.5 mph from 203°(SSW) on day 26 at time 14:51
    Maximum gust speed = 21.9 mph from 180°( S ) on day 26 at time 15:04
    Maximum heat index = 91.3°F on day 07 at time 17:21

    Avg daily max temp :79.0°F
    Avg daily min temp :56.0°F
    Total windrun = 1559.4miles

    Record low wind chill temperature = 45.0 on day 28 at time 04:54
    Record daily rain = .17” on day 25
    Record rain in 1 hour = 0.13” on day 27 at time 04:42
    Warmest day (6am to 6pm) = 79.7 on day 11
    Coldest night (6pm to 6am) = 52.6 on day 28
    Coldest day (6am to 6pm) = 56.7 on day 17
    Warmest night (6pm to 6am) = 74.7 on day 11

    Daily rain totals
    00.05 in. on day 14
    00.08 in. on day 17
    00.08 in. on day 18
    00.04 in. on day 19
    00.17 in. on day 25
    00.16 in. on day 26
    00.13 in. on day 27

  27. Timmy_Supercell (Klamath Falls @ 4200') says:

    The problem I have with instability charts is whenever I log on to the University of Washington WRF Model, it never shows us any instability in Oregon. All of it concentrated off the coast… I’ll link it:


  28. Timmy_Supercell (Klamath Falls @ 4200') says:

    Split flow will definitely mean NO windstorms. Hope this is quick and changes later.

  29. pappoose in scappoose says:

    “Scattered to numerous” showers today and the chance of a Stray Albino Donkey.

    National Weather Service Portland or
    903 am PDT Sat Oct 1 2011

    Short term…a system was off the coast this morning and will lift
    northeast through southwest Washington and northwest Oregon today and early tonight. It is taking a more classic frontal comma shape this morning…but the main front is not very strong or organized. The main energy is with the vorticity center off the coast where lightning has been observed…but this mostly stays off the coast as it lifts north today. We stay in the south to southwest flow aloft today with plenty of clouds and scattered to slightly more numerous showers as the day wears due to the offshore short wave moving through. The models show some weak instability over our area this afternoon and early evening…and will match the neighboring Seattle office with a slight chance of thunder…but the best chance will be over the coastal waters and over the mountains.

    • pappoose in scappoose says:

      “Scattered to numerous”…that’s like partly to mostly. Definitely a CYA statement, along with the “slight chance of thunder” remark.

    • Timmy_Supercell (Klamath Falls @ 4200') says:

      Haha your all about them donkeys! We better get some too

  30. PaulB/Eugene says:

    If Canadians think it will be cold this winter….


  31. September 2011 in BG

    Highest High: 93.6, 7th
    Lowest Low: 38.3, 28th
    Highest Wind: S 25, 25th
    Most Precip: 0.21″, 27th

    Total Precip: 0.88″

    Avg High: 77.7
    Avg Low: 50.2
    Mean: 64

  32. Kyle says:

    Warm nights as usual. It seems the last decade the nights have been getting warmer and warmer except for the occasional artic blast which even then sometimes fails to dip south of Portland.

  33. bgmike says:

    Summary for September 2011
    Temperature (°F):
    Mean (1 minute) 64.3
    Mean (min+max) 65.3
    Mean Minimum 51.1
    Mean Maximum 79.6
    Minimum 40.3 day 28
    Maximum 95.4 day 11
    Highest Minimum 57.0 day 08
    Lowest Maximum 59.9 day 17
    Air frosts 0
    Rainfall (in):
    Total for month 1.20
    Wettest day 0.33 day 26
    High rain rate 0.60 day 25
    Rain days 7
    Wind (mph):
    Highest Gust 23.5 day 25
    Average Speed 1.5
    Wind Run 931.6 miles
    Gale days 0
    Pressure (mb):
    Maximum 1022.3 day 28
    Minimum 997.9 day 24

  34. bgb41 says:


    High:104 at AGNESS (247 ft) on September 10th

    Low: 15 at DESCHUTES PORTABLE (5100 ft ) on September 1st

    Largest Diurnal Change: 61 degrees

    90/29 @ LaPine (4203ft) on September 23rd
    96/35 @ PRINEVILLE 4NW (2840 ft ) on September 4th
    93/32 @ COLGATE (3231 ft) on September 4th

    Heaviest 24-hour Rainfall:

    1.80″ @ NORTH FORK(3120ft) on Sept 27th

  35. bgb41 says:

    9/30/2011 Oregon (All) Temperature Summary

    High:94 at CW2286 Monument(2021 ft)
    Low: 63 at BLACK MTN RIDGE(4965 ft)

    High:55 at YACHTS Yachats(74 ft)
    Low: 32 at Mazama (4590 ft )

    Largest Diurnal Change: 52 degrees
    CABIN LAKE (87/35 ) (4560 ft )
    CW5507 Camp Sher (86/34) (3020 ft)

  36. Austin(Cornelius) says:

    Soo….what’s split flow?

  37. Boydo3 N. Albany 500' says:

    People! Relax! It’s October we’re talking about. A few early shots of rain. A few nice days with leaves showing some color…. Typically October is the month of the biggest change in temps and moisture. The early part dry and warm, transitioning to the wonderful stuff that lingers until next June. So lets just sit back and enjoy whatever comes along, knowing full well that October’s weather has NO bearing on what happens in mid winter.

  38. Karl Bonner says:

    My wishcast for October: Ease into the rain by Mon. the 3rd, then three really stormy days with just over 1 inch of rain in the western valleys. Followed by about 5 days of split flow with a few showers from time to time. Then a death ridge for October 10-18, with highs in the 80s for Roseburg and Medford and maybe Eugene, upper 70s for Portland and The Dalles day after day. Follow by the first frosty pattern in late October and then a quick shift to heavy storms and high winds just before Halloween.

    • MamaReen says:

      Sounds great! Maybe the “heavy storms and high winds” can hold off until at least the 31st? That would be ideal. 🙂

  39. Yevpolo1990 says:

    Yikes this better not be our theme for the winter! Split flow is evil.

  40. Andrew Johnson says:

    I’m hoping for a nice cool and wet October. Perfect weather to get that fireplace going!

  41. PaulB/Eugene says:

    La Nino

  42. PaulB/Eugene says:

    2nd warmest Sept…followed by what looks like a cool October..at least the first week or two.

    Garbage can weather next week in spots. No high wind warning in Will Valley

    Doubt any snow at pass elevation until at least second week of Oct…probably third week

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