Issaquah, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Issaquah, a city in King County, Washington.
Overnight
42°F
Mostly Clear
Mostly clear, with a low around 42. Southeast wind around 2 mph.
7-day forecast for Issaquah
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Mostly Clear | 2 mph SE | 2% |
| Wednesday | 61°F | Partly Sunny then Chance Light Rain | 2 mph S | 32% |
| Wednesday Night | 48°F | Light Rain | 3 to 10 mph S | 89% |
| Thursday | 59°F | Partly Sunny | 2 to 10 mph S | 13% |
| Thursday Night | 46°F | Mostly Cloudy then Light Rain Likely | 2 to 8 mph SSE | 61% |
| Friday | 57°F | Light Rain Likely | 1 to 9 mph SE | 71% |
| Friday Night | 49°F | Light Rain Likely | 3 mph SE | 71% |
| Saturday | 66°F | Chance Light Rain | 0 to 5 mph SE | 29% |
| Saturday Night | 50°F | Light Rain | 0 to 13 mph S | 80% |
| Sunday | 57°F | Light Rain Likely | 1 to 13 mph SSW | 71% |
| Sunday Night | 44°F | Slight Chance Light Rain | 3 mph SE | 17% |
| Monday | 58°F | Chance Light Rain | 0 to 3 mph ESE | 39% |
| Monday Night | 47°F | Chance Light Rain | 0 to 9 mph ESE | 54% |
| Tuesday | 60°F | Light Rain Likely | 2 to 9 mph SSE | 56% |
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
8b
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
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 Nov 4, 2026.