Snow in Issaquah, Washington Winter storm alerts · 7-day snow forecast · average snowfall
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Issaquah averages 3.8 inches of snow a year. The snowiest month is December (1.7″), and snow usually falls from November through February. On about 2 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 2 days of an average winter.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
November
0.2″
<1
<1
4
40°F
December
1.7″
1
1
8
37°F
January
0.9″
<1
1
7
37°F
February
1.0″
1
1
7
37°F
March
0″
0
0
3
40°F
Year
3.8″
2
2
30
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Seattle Sand Pt Wsfo (15 mi from the city center, -49 ft elevation difference); temperatures at Renton Muni Airport. Averages smooth out big years: single winters can bring half or double the normal.
3.8 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Seattle Sand Pt Wsfo station, 15 miles away). The snowiest month is December with 1.7 inches.
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This page checks the National Weather Service for active alerts at Issaquah's location every time you open it; the box at the top lists any winter storm, winter weather, cold or freeze alert in effect right now.
How many freezing nights does Issaquah have?
About 30 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, December, averages a low of 37 °F.