Sammamish, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sammamish, a city in King County, Washington.
Overnight
53°F
Clear
Clear, with a low around 53. East wind around 1 mph.
7-day forecast for Sammamish
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Clear | 1 mph E | 0% |
| Tuesday | 87°F | Areas Of Smoke | 0 to 6 mph NNE | 0% |
| Tuesday Night | 57°F | Areas Of Smoke | 0 to 5 mph NNE | 0% |
| Wednesday | 92°F | Areas Of Smoke | 0 to 3 mph NNW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Thursday | 92°F | Sunny | 2 mph NW | 0% |
| Thursday Night | 60°F | Mostly Clear | 2 mph NE | 0% |
| Friday | 89°F | Sunny | 2 mph SW | 0% |
| Friday Night | 59°F | Mostly Clear | 0 to 3 mph N | 0% |
| Saturday | 84°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 56°F | Mostly Clear | 0 to 7 mph N | 1% |
| Sunday | 79°F | Mostly Sunny | 2 mph WNW | 1% |
| Sunday Night | 56°F | Mostly Clear | 2 mph N | 0% |
| Monday | 79°F | Mostly Sunny | 2 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Sammamish (47.594, -122.038). Updated through the day.
Growing snapshot for Sammamish
Last spring frost
Mar 30
First fall frost
Nov 7
Growing season
223 days
Hardiness zone
8b
More local growing data for Sammamish: nearby ZIP 98075 weather · frost dates · planting calendar · Washington frost dates
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East Renton Highlands
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Federal Way
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High Bridge
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Climate data from the nearest NOAA station, Snoqualmie Falls, Wa (9.9 mi from Sammamish). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.