Big Cooldown & Next Storm Ahead

 FastCast—Saturday, Sept. 25 to Tuesday, Sept. 30:

After a hot day on Saturday, a major cooldown is ahead. Clouds and rain move in on Sunday, with rain reaching Puget Sound by the afternoon. Rain totals of up to 1.5 inches are expected by Tuesday. Thunderstorms are possible on Monday and Tuesday, and breezy conditions (25-35 mph) are possible at times through Tuesday. Expect highs in the upper 50s to mid 60s, and lows in the mid 40s to low 50s.

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Saturday was one of the hottest late-September days in recent years. Many locations reached the low 80s, and nearly everywhere in the Puget Sound area hit the upper 70s. Recorded highs are below.

These will be the last 80+ temperatures until sometime next spring, and even 70s get much harder to find from here on out.

A major cooldown is ahead, with high temperatures remaining in the 60s all week. Below is the Federal Way forecast from Weather Underground.

It will feel much more like fall, with temperatures below 65 degrees most of the week and frequent rain. 

The most rain will fall late Sunday to early Monday, as a front moves through. Below is the UW forecast for rain through 5 AM Tuesday.

Expect 1-1.25” from Seattle southward, and less in the rain shadow north of Seattle (0.3-0.75”). The most rain will fall on the coast (1-3”), north of Mount Vernon (1-2”), and in the mountains (1.5-7”). 

The snow level will be around 5,000-6,000 feet during this storm, so a few inches of high-elevation snow is possible as well.

Be prepared for breezy conditions at times from late Sunday to Tuesday. The 5-forecast blend for Federal Way (from the Windy App) is below.

Expect gusts of 25-35 mph at times, highest near the water and stronger north of Everett and on the coast.

There is also a slight chance of thunderstorms on Monday and Tuesday, mainly during the day, as post-frontal showers move through. Be prepared for this potential!

It is safe to say that we will end September with much more than the average monthly rainfall…much needed after such a dry summer!