Heat Wave Day #5: More Humid & Warmer Nights Ahead, Then It Gets Better

5:30pm Thursday…

It’s ANOTHER scorcher out there folks.  I see it’s 95 on the roof of the FOX-12 broadcasting fortress (business park building).  Officially here in Portland we hit 96 degrees this afternoon, that’s our 5th day into the mid 90s.

Let me throw a whole bunch of hot numbers at you…

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10 of the last 14 days have stayed above 90 here in Portland

High Temp Last 13 Days

This is our 16th day at/above 90 degrees this summer, we’re headed for 20-21 by the time this heat wave ends!

90 Degree Days Summer Heat

Of course you may be wondering if we’re breaking any sort of “consecutive 90 degree days” record?  IF the last 90 degree day is Monday, we’ll be at #9.  If we still reach 90 on Tuesday, we’ll tie the all-time record of 10 days at/above 90 set during the 2009 heat wave.  Remember those back to back 106 degree days?  95 doesn’t seem so bad now does it?

90 degree streak history


  1. A slight cool-down Friday/Saturday due to a very weak seepage of marine air into the western valleys of NW Oregon and SW Washington…high temps drop closer to 90.
  2. Hotter again Sunday/Monday as weak onshore flow ends.  We could hit 100 on Sunday…for sure it’ll be between 98 and 102 that day.  That’s assuming we don’t get a bunch of thick fire smoke.  Speaking of…
  3. On Sunday, and possibly Monday, all that fire smoke plaguing SW Oregon may move north on southerly upper-level winds.  Could be a very smoky/hazy day or two.  Westerly flow returns later Monday/Tuesday and that would clear us out again
  4. Higher relative humidity.  Models are all showing rising dewpoints (measure of moisture in the air) both Sunday and Monday.  Most likely due to the slight influx of marine air plus southwesterly flow developing overhead as the strong ridge rebounds just to our east.  This means not only hotter weather Sunday & Monday but more humid…yuck!
  5. Warmer nights.  A hotter airmass plus more humidity means our current low-mid 60s low temps will warm another 3-5 degrees.  The result will be lows closer to 70 in the Portland urban areas Sunday and/or Monday mornings.  2nd yuck!

Try to stay cool the next 4-5 days…getting into water is an excellent idea…check out those river temps!


Speaking of water, two years ago I picked up a smokin’ hot Craigslist deal.  A nearly new pool someone wanted to unload quickly at less than 1/4 the original price.  Those are the best few hundred dollars I’ve spent!  This is my new mid-summer “pre-work” exercise routine…


Chief Meteorologist Mark Nelsen



24 Responses to Heat Wave Day #5: More Humid & Warmer Nights Ahead, Then It Gets Better

  1. W7ENK says:

    Noon o’clock, 82 degrees, 50% humidity, dewpoint 63F, milky skies overhead.

    100% grody.

    • Anonymous says:

      …other than a bit lower humidity, it was the same over here at noon…it’s getting smokier by the hour…

    • Paul D says:

      Been outside on and off about three hours today at work – it SUX! I feel like a sponge that can’t take anymore water.

  2. Ken in Wood Village says:

    I went to Astoria today for a family BBQ. It was so nice to be able to be outside in the sun and not be HOT. The temp on the car said 71F. When I drove back home it was nice until I hit Longview. Then the car temp went up to 84F. All the temp did was go up from there…lol.

    I was looking at the EURO about 30 minutes ago and it shows a nice low coming in a week from this Monday. I know, it’s way out there but it would be nice…lol. I did notice something interesting though. North Alaska will be in the 30’s starting around Thursday. 🙂

    • Paul D says:

      I was in Seaside Wednesday through Friday. It was so nice to be outside and not melt!

      • Ken in Wood Village says:

        Lol, I was thinking the same thing when I was in Astoria. I need to visit my brother and his wife more often…hehe

  3. W7ENK says:

    Went for a little afternoon trek around Elk Rock Island today. Looks the like weather over Washington’s got a bit of an attitude.


    • Ken in Wood Village says:

      I was coming back from Astoria this afternoon and saw some nice Thunderstorms from HWY 30. Since I was the only person in the SUV, I couldn’t take pictures. I wanted to stop but there were so many people driving (which I passed a lot of them) and I didn’t want to have to pass them again…lol

    • MasterNate says:

      Looks like that cloud is flipping you off

  4. Linda Cramer says:

    snow please

  5. Paul D says:

    I hate it when the forecasters tease me by putting in below normal temperatures in the 7-day forecast! You watch – those upper 70’s will turn into low 80’s by the time we get there! 😦

  6. Tyler Mode in Battle Ground says:

    First solidly cloudy morning here since the 19th. It hit 92 here yesterday and I’m hoping today’s clouds are enough to keep us below 90.

    The low of 57 is the 3rd warmest of the month. Knock on wood, have yet to have a low above 60.

  7. Mike says:

    that pool can be a great benefit if there was a nearby fire.. Have a gas pump ready with a large pump that can pump a great volume of water.

    Another way is to install a shower drain to the bottom and have a ball shut off valve plumbed in with two inch pipe. However, I would check with the fire Dept. to find out what their equipment requires so they can adapt if they ever need that water.

  8. Roland Derksen says:

    Smokey,hazy days upon us. I saw a red sunset last night , but our famous sky line was almost invisible.

  9. Tyler Mode in Battle Ground says:

    52.6 this morning. I love how despite the afternoon heat, the overnight lows have been able to cool off. I wonder if less smoke has to do with that? There are even a few low clouds around this morning.

  10. Jason Hougak says:

    Looks mighty relaxing Mark. Glad the well and pump are working great for you. Enjoy the water!

  11. willian says:

    Mean while Greenland, the shorebirds returned in June to breed. Seems three feet of “thing of the past” blocked them from building nests and finding food. Thank you media for only focusing on heat, never cold events during northern hemisphere summers.

  12. K says:

    Not good for the fires- there’s already a new one near the Substation Fire burn area. 6,300 acres and growing.

  13. High Desert Mat says:

    Please put your shirt back on Mark!! Leave some women for the rest of us! Lol

  14. W7ENK says:

    Oh please no, no humidity!! I can handle the heat as long as it’s dry, but hot and muggy is terrible!! 😦

  15. Larry says:

    I’m ready for the snow to start now.

  16. Paul D says:

    Ugh. Kick ’em when they’re down! 90’s and humidity? Nasty!

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