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Western Washington forecast

Hot weather has arrived. Possible mountain thunderstorms this weekend. Cooling slightly Sunday.


Clear skies overnight with warmer low temperatures in the upper 50s to low 60s. Wind from the north 10-15mph becoming light.


Friday, is most likely the hottest day ahead. Expect our onshore wind to weaken and allow highs to climb in the 80s to low 90s. 

Over the weekend, some moisture and instability from the southwestern monsoon, will drift northward into eastern Washington during the day on Saturday and Sunday for eastern Washington and the Cascades.  Cloudier skies and possibly a few thunderstorms both Saturday and Sunday. Some storms in the Cascades, including the west slopes of the Cascades, are possible, but, right now it looks like they should stay out of the lowlands of western Washington. But you might hear a roll of thunder in the distance. We will have a better idea of how far west they will drift once the weekend is in range of the high-resolution models. We will watch it closely. Temperatures will cool significantly on Sunday.

Mostly sunny and cooler weather should head our way to start the workweek next week.

Wild fire smoke may continue to drift over high elevations. The smoke may increase a bit on Friday, but, it will be at higher levels with air quality remaining good at the ground.

Counting Thursday, we have now had 45 consecutive days without measurable rain at Sea-Tac Airport, which puts it in the top five longest dry stretches. The top stretch goes to the summer of 2017 with 55 consecutive days. Will we break it? We have a very slight chance we might see a shower on Sunday or next Thursday, but odds of it hitting the rain gauge at Sea-Tac seem low. And there is a better chance of more widespread showers towards the end of next week - which would cut the streak just short of the record! We'll keep counting!!