Seattle woke to clouds and cool air on Monday, May 11, with Boeing Field reporting about 55°F and overcast skies at 5:35 a.m. PDT. Morning low clouds are expected to thin by late morning, giving way to a sunny afternoon with highs near 68°F and light north winds. The warmest day in this stretch looks to be Tuesday, May 12, when inland neighborhoods could reach around 78°F before a return to onshore flow brings cooler air and a chance of showers by midweek.
Afternoon Sun And Tuesday Warm-Up
Once the morning marine layer breaks up, bright skies should take over and temperatures will climb through the 60s, with north winds of about 3 to 10 mph helping to keep conditions dry through today. Tuesday, May 12, is expected to be noticeably warmer for inland spots, with highs near 78°F while coastal areas stay cooler in the mid 60s. The pattern is driven by a ridge of high pressure, and the National Weather Service has the full forecast details.
Midweek Shift And Boaters On Alert
There is about a 40% chance of light rain late Tuesday night after 11 p.m. into Wednesday morning, with forecasters noting some uncertainty and saying isolated showers or brief thunderstorms are possible on Wednesday. Mariners and small boat operators should watch for pushes of stronger winds through the Strait of Juan de Fuca in the midweek period and check the latest marine products. For context, you can line up this update with our earlier May warmup outlook.
