Much Cooler Weather, First Frost of the Season Likely by the Weekend

Much cooler weather is heading for Western Washington. It will be a major transition from the breezy, 55-65 degree weather that has dominated the past few days.

The outlook above is from NWS Seattle, showing expected weather for the week.

The biggest weather story is the transition to cooler weather. The low temperatures on Monday will be near the high temperatures on Friday and Saturday.

Take a look at the weather.com 10 day forecast for Puyallup.

There is a steady decline in temperatures all week, bottoming out with highs struggling to reach 50 degrees and lows near/below freezing on the weekend. Our first frost of the season is likely during the next week, with multiple frosty mornings likely. 

This means the end of the growing season. In addition, the first mountain snow of the season is likely at the end of the week and into the weekend. Below is the first snow map of the season in the blog...showing expected accumulations through the next 7 days.

Snow levels will be around 3,000 feet, so light accumulations on the passes are possible. Expect 2-10 inches of snow in the mountains, with 1-4 inches possible in parts of Eastern Washington. 

No snow likely in the Puget Sound area right now. 

Bottom line...expect a transition to colder weather through this week, with freezing temperatures and frost likely by the weekend.