Washington weather by county

39 counties · records since 1895, through September 2026.

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Washington in September 2026

0 of 39 counties ran at least 1° warmer than usual in September 2026, and 36 ran at least 1° cooler.
Warmest against its own records: Whitman County (47th-warmest September of 132). Coolest: Skamania County (37th-coldest).
Wettest September against its records: Kittitas County, 2.8 inches (7th-wettest).
32 of 39 counties were in moderate drought or worse on NOAA's Palmer reading for September.
Since 1970 the state's counties have warmed about 0.4° per decade on average, Adams County the most at 0.5°.

This week's forecast against the usual, and every month since 1895, for all 39 counties in Washington. None had a top-10 warm September in 2026.