The first week of Fall is complete and the rain gauges are filled! There is 3.44” for the month at Sea-Tac which is 1.91” above the monthly normal!
September's last day starts with fog, low clouds, and chilly temperatures in the upper 30s to low 40s. Thanks to a north breeze, most areas will clear to sunny skies by mid-morning and high temperatures will be warmer in the upper 50's to low 60's.
October's first day, Sunday, will repeat the fog-to-sunshine play with a degree or two added on to the daytime highs, a few upper 60s expected. However, Sunday evening the skies will become cloudy when a frontal system approaches and brings in morning rain Monday. The morning commute will be rainy. Monday afternoon there will be some lingering showers, especially in a convergence zone between Seattle and Everett. High temperatures will fall into the 50s again.
Tuesday a second weather system sliding through Canada will bring rain showers across Whatcom and Skagit Counties including the North Cascades. Much of western Washington will have a mostly cloudy day, and areas of drizzle, with highs in upper 50s to low 60s.
Ready for a change? That arrives in weather form of an Indian Summer that begins Wednesday! As high-pressure builds, it warms the air and clears the area for morning clouds and fog which breaks to sunny skies while afternoon highs climb into the upper 60s. By the time the first week of October is ending, we will have some temperatures in the low to mid 70s!
Meteorologist Rebecca Stevenson
The KOMO 4-Cast Team
Updated for Saturday Morning