Record High Temperatures

7am Saturday…

What a scorcher yesterday, as expected.  The highlights (thanks to Portland National Weather Service):


Click on these for the full image…

A few notes:

  1.  Friday was the first time we’ve reached 100 in late August (or September) since 1988!  It’s rare to get to 100 this late in the summer season as the sun angle gets lower and nights longer
  2. Astoria just experienced its hottest day in 55 years!  2nd hottest on record at Astoria airport since records began there in 1953.  It hit 100 in 1961 at that location.  Other locations in the Astoria climate record show temps warmer than 98…that was a cause of some self-induced Twitter drama on my part yesterday.
  3. Notice some spots in the north Willamette Valley and Clark County were slightly cooler today?  That was due to the east wind being a little “too strong”.  Slightly cooler air coming in from Eastern OR/WA.  That’s a really tough call in the forecast.  The areas that already had the NE wind Thursday were slightly cooler Friday. Interesting that some models picked up on it.  I think the WRF-GFS and ECMWF had hinted at the possibility.  A very fine nuance to the forecast, but interesting for geeks like me.
  4. 850mb temp over Salem hit +23.4 degrees yesterday afternoon, down just a degree from Thursday afternoon.  Yet some temps warmer in the valley/coast shows what the offshore wind flow can do.  Now image if we would have reached +27 degrees instead!  That’s what happened in mid-August 1977 when PDX hit 105 and some valley locations even warmer.

Here’s an interesting tidbit of hardcore PDX climate info, from Chris Callais over on both weather Facebook groups…yesterday appears to have seen the 2nd warmest noon temp we’ve seen at PDX:



We’ve got one more scorcher today and then Sunday looks wonderful with strong onshore flow.  Troutdale profiler at 6am shows (weaker) offshore flow still going:


It is slightly cooler in the lowest 1,500′.  Hmmm, might just be a 97-99 degree day instead.  That’s quite possible.  We’ll see.  Either way, one more hot day.  Stay cool!

The lengthening nights sure make a difference on our low temperatures this time of year.  I see some 50s in the outlying areas even under this hot airmass.  And PDX made it down into the lower 60s once the wind disappeared.  Yet in a few breezy spots in the hills (West Hills and Eola Hills near Salem) it only got down into the lower 70s.  Feels like Hawaii!

I see low clouds have returned to the coast so it will be MUCH cooler out there.  If you head out there (along with masses of others), it’ll be in the 60s and 70s…very nice.

Chief Meteorologist Mark Nelsen




50 Responses to Record High Temperatures

  1. WEATHERDAN says:

    Much has been made about what a cool Summer this has been by Mat and others. Well not so fast mattie. The avg for June max + min was 65.6 or 2.1 degees above normal. July was 69.1 or 1.1 degrees above normal. August has been 72.3 or 4.8 degrees above normal. Broken record or not mattie this has not been a cool Summer. Even Mark has said so. But hey why bother with the facts when a lie works just as well. Right Matt.
    now to be fair to mattie July max only was cooler than normal by .8 of a degree. But warm nights made our average warmer than normal. As for a wet Summer also wrong. Normal for June-August is 2.54. So far we have had 1.65 with no rain forecast through the 28th.So what we have had is a warm dry Summer just not record breaking. Peace

  2. High Desert Mat says:

    New phone. Wanting my old links for this new phone. Can’t quite remember what they are. One is the gfs ensembles which was wetterzentrales or something, and the other one I’m missing is the euro with the classic style I believe. Thanks guys.

    Btw, where is Rob atmospheric wrath?

  3. Joshua Downtown PDX says:

    12z GFS ensembles show the temp nose diving Saturday/Sunday after our mini heat wave later this week. Then, near or below normal indefinitely.

    • Paul D says:

      Huh? Have you seen the 7 day forecast? 90+ Wed-Sat. That’s quite a bit above normal.

    • Chris s says:

      Paul, that 90+ on Saturday will be gone most likely with the new 7 day. So really it’s just Thursday and Friday that appear to be above 90 for Portland area anyway. Looks glorious after that. Well, not for resident Phoenix man Dan. 😂

    • Paul D says:

      I hope you’re right, but there is a 92 on Wednesday.

    • Joshua Downtown PDX says:

      Wednesday, Thursday, and Friday will be the hot days. Mark will no doubt lower Saturday’s temp. I suspect you will like Sunday’s even better.

  4. Dave in SW PDX (235') says:

    Currently a refreshing 64° after an overnight low of 55°. My high temps for Thur/Fri/Sat: 99°/98°/100°. Thought I wouldn’t reach the century mark yesterday, but the temp finally jumped up there around 4:30pm, just before the onshore flow kicked in.

  5. With last week’s warmth, my mean August temperature now is about half a degree above last year’s August mean. We still have 11 days to go: Despite the cool down today and tomorrow, I could still end up setting a new record for warmest August, breaking the previous one in 2014. Of course, on the other hand,with a sudden change (like at the end of August 2015) that won’t happen.

    • Paul D says:

      It may be cooling down for a couple days, but then it’s back to the 90’s, so you’ll probably set a record.

    • Yeah, you’re probably right. Anyway, quite a nice breeze here today. 69F at noon. Some clouds moving in a well. Might see a shower or 2 this evening.

  6. Scooter says:

    Here is my 3 day high temp. readings:

    Thursday ~ 103
    Friday ~ 104
    Saturday ~ 102

    Looks like we get episode 5 heat wave later next week.

  7. WEATHERDAN says:

    101 today. More hot weather late next week. What’s not to like about this Summer. Other than it being so cool and wet. Peace.

    • High Desert Mat says:

      Sounds like a ten year with a broken record. You don’t get responses so you keep saying the same thing over and over? Really? I thought you were in your 60’s, you act like a spoiled kid that wants friends but won’t let them play with your toys. Get real Dan and grow up. Three heat waves in a relatively cool summer, compared to the last few, and you’re still cocky. Ya, you have nothing missing from your life. Lol

    • Paul D says:

      I’m tired of the cool and wet. When will we get some nice weather?

    • Timmy_Supercell (Klamath Falls, OR) says:

      Sorry, but who’s “wet and cool” this summer? Everyone’s been either average or slightly above average since June 1st, unless you’re in extreme NW Washington state… 😛

    • Mike near Clackamas Town Center says:

      If only I could collect a dime for every time the same few ppl comes and mess with Dan. Quit baiting him and you grow the f up, Mat.

    • High Desert Mat says:

      Mike, mind your biz. Who was baiting? I simply responded to his post a$$ wipe. I believe he was baiting, if only you could read.

    • Mike near Clackamas Town Center says:

      Well Dan is right. I wouldn’t like this Summer if it was cool and wet either. I think it’s really weak to call his post baiting when a majority of Portlanders agree with him 😉

    • WEATHERDAN says:

      You asked where Rob went. He left because of trolls like you. But you are stuck with me sport.

  8. Timmy_Supercell (Klamath Falls, OR) says:

    8% humidity and 22 DP at 4:53pm observation here!

    Not even Death Valley is that low!

  9. Garron 1/3 of a mile from Hillsboro Airport says:

    Fun/crazy that we broke the records for second earliest, and second latest 100 degree readings for Portland in the same season! Us weather geeks will be talking about and using this summer as a benchmark for hot spells for years to come! What are the 850 MB temps forecast for late next week? Any chance we could see another 2nd latest 100 d/f reading out of that one???

  10. 84 for a max today. Now 82.5 and falling. 55 this morning. Nice to not be cooped up in the office (not a big fan of a/c; it just ruins one’s heat acclimation and makes time outdoors less comfortable). Rare to have a day warm enough to feel comfortable shirtless up here. All that said, I don’t miss the triple-digit heat.

  11. Lee Wilson says:

    Holy hot tamales. ..we hit 107 …its 100 now…please say it truly is over…yesterday was low humidity to day the humidity is 24 percent.

    We have 2 airconditioners running.
    And drinking lots of water.

    Last I remembered this kind of heat in early fall, we had a real bad winter hit.


  12. runrain says:

    PDX did it. First time ever with two consecutive 100 deg days after the middle of June. Guess less east wind helped.

  13. chris s says:

    I’m very skeptical of the 104 here in Salem yesterday. There are no actual 104 readings in the observations page, and they are taken every 5 min…. I also notice that ever since they went to showing 5 min intervals for temp observations at Nws, that the readings seem high, not being a conspiracy theorist or anything, but gotta wonder if they have a certain agenda in fudging the numbers ever so slightly to the high side…….

    • Timmy_Supercell (Klamath Falls, OR) says:

      KSLE – “6 hour max” – 104 degrees. Here ya go.


    • Chris s says:

      I think you misunderstood what I said. I know it’s listed in the 6 hr max, it’s not listed in any of the 5 min obs, and the temp would have had to move 2 degrees in less than a 5 min period yesterday for it to have happened. That’s why I’m calling bs on it.

    • James Jones says:

      That’s because those between hour readings aren’t accurate. There’s plenty of times where they show readings warmer than the actual reported high, and plenty of times where it shows readings colder than the actual reported low.

    • WEATHERDAN says:

      Oh for heavens sake stop whining will you.First you doubt me. Then you doubt the NWS. When do you start to doubt Mark, Monday?. See ya later sport.

    • Chris s says:

      Lol ok Dan… I haven’t and won’t doubt Mark, but it’s easy to doubt the Nws, they are pretty pathetic most the time with their forecasts. Yesterday truly looks fishy, I highly doubt on a hot day like yesterday that a supposedly accurate sensor would read low. And for it to have been 104 yesterday, would again have taken a 2 degree swing in 4 min according to all the 5 min observations. So ya, I’m calling bs. Nobody asked for your opinion, as well everyone knows your warm biased agenda.

    • Scooter says:

      Many small and unique micro-climates in any given local, so I would not be surprised to see a wide range of temperatures across the larger metro area. I had a reading of 104 degrees for a while yesterday.

      Another factor that some of the amateur weather folks might not consider is the very warm dry air mass we had through this heat spell does not take much to change temperature as it does not have the capability to hold much heat per se, with such a low amount of water vapor in it.

    • Scooter says:

      Another thought was the wind and breezes yesterday, these could cause rapid changes on weather sensors, for instance have you ever been out walking and suddenly have “hit” a warm pocket? I know I have many times and everyone always seems to mention them, I would suspect that sensors would “feel” these also.

  14. Timmy_Supercell (Klamath Falls, OR) says:

    I had a couple record highs, though cooler than the west sides as usual. 96 yesterday and on Thursday, both breaking 95 degree records set in 1967.

    Still haven’t seen 100 this year in Klamath. Surprisingly it’s been 3 years and nearly 2 months since my last 100+ day, despite 2015 and 2014 being so hot here.

  15. oldwxwatcher says:

    “Only” 98° here in E. Portland yesterday thanks to the gusty east winds.

  16. Paul D says:

    Thanks for all the coverage the past few days Mark! Your blog is the best!!

    Looks like another hot spell late next week. Any potential records then?

    • Joshua Downtown PDX says:

      Paul, the records for next Thursday, Friday, Saturday, and Sunday are 94, 100, 97, and 102. We might break Thursday’s record. The rest will be tough. We’ll see.

  17. Scooter says:

    It appears that 10 miles east of Oregon City we warm up quicker than Portland with the downslope compression heating as we can be 10 to 15 degrees warmer than what Portland is reporting in the morning hours before noon. My amateur conclusion is that the heat gets somewhat trapped here in the Clackamas River Valley as the valley makes a 90 degree sweeping turn at Barton to flow out to the west.

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