Issaquah, WA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Issaquah, a city in King County, Washington.

Overnight

52°F

Mostly Cloudy

Mostly cloudy, with a low around 52. South wind around 1 mph.

7-day forecast for Issaquah

When	Temp	Forecast	Wind	Precip
Overnight	52°F	Mostly Cloudy	1 mph S	0%
Saturday	75°F	Partly Sunny	1 mph WNW	0%
Saturday Night	53°F	Mostly Clear	0 mph	0%
Sunday	75°F	Mostly Sunny	2 mph NNW	0%
Sunday Night	52°F	Mostly Clear	2 mph N	0%
Monday	73°F	Mostly Sunny	2 mph NNW	0%
Monday Night	52°F	Partly Cloudy	2 mph N	1%
Tuesday	70°F	Partly Sunny	1 mph N	1%
Tuesday Night	51°F	Mostly Cloudy	1 mph SE	8%
Wednesday	69°F	Partly Sunny then Slight Chance Light Rain	2 mph WSW	16%
Wednesday Night	51°F	Slight Chance Light Rain then Mostly Cloudy	1 mph NNE	16%
Thursday	66°F	Mostly Cloudy then Slight Chance Light Rain	2 mph N	20%
Thursday Night	50°F	Slight Chance Light Rain	2 mph NNE	20%
Friday	65°F	Slight Chance Light Rain	2 mph N	17%

Forecast source: National Weather Service (api.weather.gov) for Issaquah (47.544, -122.049). Updated through the day.

Growing snapshot for Issaquah

Last spring frost

Mar 30

First fall frost

Nov 7

Growing season

223 days

Hardiness zone

More local growing data for Issaquah: nearby ZIP 98029 weather · frost dates · planting calendar · Washington frost dates

Nearby towns & communities

Algona Ames Lake Auburn Baring Beaux Arts Village Bellevue Black Diamond Bothell Boulevard Park Bryn Mawr-Skyway Burien Carnation Clyde Hill Cottage Lake Covington Des Moines Duvall East Renton Highlands Fairwood Fall City Federal Way Greenwater High Bridge Hobart Hunts Point Index Kenmore Kent Kirkland Lake Forest Park

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Climate data from the nearest NOAA station, Snoqualmie Falls, Wa (8.3 mi from Issaquah). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.