It was a stellar day with highs in the upper 70s in Seattle — the warmest day of the month so far!
The ridge of high pressure responsible for today’s warmth is fading tonight, opening the door for stronger marine onshore flow to push back inland. That means Thursday starts with widespread low morning clouds and cooler highs tomorrow in the lower 70s. A weak convergence zone could spit out a few sprinkles Thursday evening but the vast majority of the lowlands will stay dry.
On Friday, expect morning stratus and few pockets of drizzle with some afternoon sun, with highs in the upper 60s to near 70 in Seattle.
The main forecast event arrives Saturday as a low pressure area tracks across Washington and Oregon. While there’s still some uncertainty on the exact center of the low and rainfall timing, the best moisture looks aimed from King County south through the southern Cascades. There’s also a slim chance of a late-day thunderstorm Saturday. Highs will be in the 60s.
Showers gradually taper on Sunday morning, with lingering mountain rain giving way to a slow drying trend into early next week.
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