Hot Weather Through Thursday, Then Cooling

11pm Monday

Today we hit 92 in Portland, our 22nd day this year at/above 90 degrees.

90 Degree Days Summer Heat

We are two days into our early August heat wave; I expect three more hot days this week.

Mark Hot Heatwave So Far

Will we hit 100 degrees?  I think it’s unlikely since fire smoke will continue to stream north through the rest of the heat wave.  Today you could see the “dim sun” outside giving the ground a yellowish look.  It sure reminds me of late last summer!  That, even with 850mb temps up around +23 Wednesday & Thursday should keep us just under 100.  But it’ll be close.

There is excellent agreement that an upper-level trough will move overhead late Friday and Saturday, pushing in a 5,000′ thick layer of cool marine air along with a much cooler atmosphere higher up.  That drops us into the 80s Friday and maybe 70s on Saturday.

By the way, as of this moment (through August 6th) we are enduring the 2nd hottest summer on record in Portland.  That’s right behind 2015 and just ahead of 2009.  Of course we still have 3 weeks left in meteorological summer so we’ll see how things turn out in the end.  Regardless, any hopes of a reasonably “cool” or average summer have been dashed by now!

MarkSummer So Far

Notice Salem, which has a much longer period of record, is running at 3rd hottest.  Other cities aren’t even in the top 5.  Seems like this is likely due to a growing urban heat island on top of our warming climate.  Cities are warming more quickly than rural areas or smaller towns.

Try to stay cool the next few days!

Chief Meteorologist Mark Nelsen





30 Responses to Hot Weather Through Thursday, Then Cooling

  1. Tynan W says:

    I have a feeling were going to come close to the 29 mark sooner or later. sigh….

  2. W7ENK says:

    Well well well, would you look at that…

    Friday morning

    Saturday morning

  3. Tyler Mode in Battle Ground says:

    As of 9 AM in Battle Ground, running 7 degrees cooler than yesterday at the same time. 66 currently.

  4. Jason Hougak says:

    The ground is so dry. Even reliable springs for Community water systems in Welches are having problems. Luckily they planned and have backup wells. Look around… things in Oregon are changing… I don’t like it. More people, more roads, more traffic, more development, on… and on… it goes.

  5. Ken in Wood Village says:

    I think someone in the last post said something about Thunderstorms but I don’t remember who it was? I’ve been looking at the models and I see something interesting in the 00Z GFS and some what on the EURO that tomorrow night we could see thunderstorms over the Cascades. Also, Saturday morning and afternoon we could see thunderstorms. Both the GFS and EURO show this too. Maybe we could have something to watch “finally” LOL 😉

    • W7ENK says:

      It was me. Any time I see a stark, overnight shift from high 90s or 100 down to 70s or low 80s with mention of precipitation, that just screams nocturnal thunderstorms. I’m surprised no one else has caught on yet.

      • Ken in Wood Village says:

        I thought there could be thunderstorms but just didn’t know when we could see them. My only problem right now is the haze. If we do see thunderstorms, it could be hard to see them during the day. At night it’s easy, just follow the flashes…lol. If we don’t get anything, I will just be glad to have a wind shift. It looks so gloomy in the sky right now 😦

      • Ken in Wood Village says:

        I just looked at the GFS model, I believe it’s the 12Z run. I’m looking at the website ( I think I may have to go up towards Seattle.

        It’s been awhile since I posted a picture so I hope this is correct. If not, I’ll try it again.

  6. Roland Derksen says:

    I agree that this summer is possible to be the hottest one on record- however, we still have about 6 weeks to go before it officially ends. Anyone down in Portland recall the summer of 1978? How was it there- hot like here until August 8th, then becoming rainy and cooler- or was it different? I’m curious to know.

  7. Joshua Lake Oswego says:

    So, our cooldown is now one day of below-normal temperature. Every other day in the next 15 is above average. 90s all next week AGAIN. Zero chance of meaningful rainfall. At some point this nonsense has to end, right? We are getting kicked while we are down. Rant over (until I look at the models next in a couple of days).

    • Joshua Lake Oswego says:

      And, anybody that says “it’s not that bad” or “such and such year was worse” is objectively wrong. When this is said and done, we will have had the hottest summer in recorded history with the most 90 degree days in recorded history preceded by the hottest May in recorded history, and a historically dry mide/late spring and bone-dry summer.

  8. Susan Sloan says:

    Question: Is it my imagination, or is it suddenly more humid than it used to be? I’ve lived in Portland area 40 years and don’t remember it ever being this humid with the heat. Thanks for answering this.

  9. Jake in Gresham says:

    It can be 34F and raining sideways in the dead of Winter and I will go for a run outside.

    What I will not put up with is smoke, smog and near 100 degrees followed by temperatures at night that make me have to run at midnight so I’m not totally drenched.

    Yet another Summer with smoke and smog. About had it. This Summer started out cool. I really hope this doesn’t go into October.

    • Jake in Gresham says:

      Mama Chewbacca:

    • Ken in Wood Village says:

      Hehe, I do my grocery shopping at night now. It’s so exhausting to do it during the day. I’m glad grocery stores stay open late…lol

  10. W7ENK says:

    Hoping Central Oregon cools off a bit this weekend. Wouldn’t mind a good thunderstorm, just so long as it brings some rain. Not really feeling like dodging dry lightning strikes.

  11. Roland Derksen says:

    Oh well, at least there won’t be any new records for daily maximums broken- I think. Rain is supposed to come here to my area on Friday and Saturday. I hope it reaches us this time.

  12. Muxpux (Castle Rock) says:

    Like I said on the Facebook group, this summer hasn’t been unusually hot up here in Cowlitz County.

    The marine layer has been playing a huge role in this. Most mornings (even where I’m at in Castle Rock) have started out with clouds, and the marine oush each evening has been capping our highs. That 9 day stretch Portland had of 90+, Kelso broke 90 I think 2 or 3 times. One day not even making it to 80. Where I’m at, we’ve been a lot warmer, making it to 90 5 of those days. Amazing what just 7 or 8 miles can do when the marine layer is involved.

    It’s been held at bay just enough to keep Portland hot, and I feel like each evening when it comes back onshore, and heads down the Columbia, it gets compressed a bit, and Portland squeezes another degree or two. PDX always seems to hit their peak after Kelso starts their cool down.

    I wonder a bit too, if the UHI controbutes to the marine layer being held at bay.

    Warm air expands, and it would seem that Portland being warmer would create a bit of a dome effect keeping the cool toungue of that marine air from getting close.

  13. Ken in Wood Village says:

    I’m can’t wait until September. My birthday month…lol. I hope we get cooler and wetter weather then…lol. First 😉🤗

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