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Weather in Coulee Dam, WA · National Weather Service + NOAA

Winter means it in Coulee Dam

Coulee Dam has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 88°, a January night drops to 22°. Normal November highs come to 44°, and lows to 28°.

Winter 36°/22°Spring 62°/36°Summer 85°/53°Fall 61°/37°
Right now
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Sunrise 9:45 am · sunset 7:33 pm

Getting the latest forecast from the National Weather Service…

What stands out about Coulee Dam’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Among Washington’s coldest wintersJanuary nights average 22°, colder than 599 of 639 Washington towns.A dry climateJust 10 inches of rain and melted snow a year, less than 98% of U.S. towns.
A normal year

Where today sits in Coulee Dam’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
36° / 22°
Snow is rare
Spring
62° / 36°
Last frost around Apr 22
Summer
85° / 53°
33 days reach 90° in a normal year
Fall now
61° / 37°
First frost around Oct 21
Pastthe usual first frost (Oct 21). Last frost next spring: Apr 22
Best months to be outside
MayJunSep
Highs of 62–84° and lows of 40° or more
When is it wettest?December, with 1.4 inches.Is it warmer than it used to be?+0.7° vs. the 20th century.What is each month like?Highs, lows, rain and snow for all 12.

Weather talk

Road reports, first frosts and storm memories from neighbors in Coulee Dam.

Town Square →
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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Coulee Dam itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Coulee Dam 1 Sw, WA (1 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.