Issaquah, WA Weather & Growing Conditions
Overnight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. South southeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Cloudy | 2 mph SSE | 0% |
| Saturday | 73°F | Partly Sunny | 2 mph WNW | 0% |
| Saturday Night | 51°F | Mostly Clear | 1 mph NE | 0% |
| Sunday | 73°F | Mostly Sunny | 2 mph N | 0% |
| Sunday Night | 51°F | Mostly Clear | 2 mph NNE | 0% |
| Monday | 71°F | Mostly Sunny | 2 mph NNW | 0% |
| Monday Night | 50°F | Partly Cloudy | 2 mph NE | 1% |
| Tuesday | 67°F | Partly Sunny | 1 mph NNW | 1% |
| Tuesday Night | 49°F | Mostly Cloudy | 2 mph E | 8% |
| Wednesday | 66°F | Partly Sunny then Slight Chance Light Rain | 2 mph SW | 15% |
| Wednesday Night | 49°F | Slight Chance Light Rain then Mostly Cloudy | 2 mph ENE | 15% |
| Thursday | 63°F | Mostly Cloudy then Slight Chance Light Rain | 2 mph NNE | 20% |
| Thursday Night | 48°F | Slight Chance Light Rain | 2 mph NE | 20% |
| Friday | 62°F | Slight Chance Light Rain | 2 mph N | 17% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Issaquah, WA
Last spring frost
Mar 30
First fall frost
Nov 7
Growing season
223 days
Hardiness zone
8b
Explore more for Issaquah, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Snoqualmie Falls, Wa (7.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.