Hamilton, WA Weather & Growing Conditions
Overnight
41°F
Mostly Clear
Mostly clear, with a low around 41. East northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Mostly Clear | 5 mph ENE | 0% |
| Wednesday | 60°F | Mostly Sunny then Slight Chance Light Rain | 5 to 8 mph ESE | 21% |
| Wednesday Night | 46°F | Light Rain | 5 to 15 mph S | 97% |
| Thursday | 56°F | Chance Light Rain then Partly Sunny | 7 mph S | 36% |
| Thursday Night | 44°F | Light Rain | 7 to 14 mph ESE | 95% |
| Friday | 54°F | Light Rain | 7 to 15 mph ESE | 95% |
| Friday Night | 46°F | Light Rain | 7 to 10 mph E | 78% |
| Saturday | 61°F | Chance Light Rain | 8 to 12 mph ESE | 46% |
| Saturday Night | 47°F | Rain | 8 to 15 mph SE | 84% |
| Sunday | 54°F | Light Rain | 2 to 10 mph S | 80% |
| Sunday Night | 41°F | Chance Light Rain | 2 to 8 mph ESE | 27% |
| Monday | 56°F | Chance Light Rain | 8 mph E | 47% |
| Monday Night | 45°F | Light Rain Likely | 7 to 14 mph E | 68% |
| Tuesday | 57°F | Light Rain Likely | 12 mph ESE | 68% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hamilton, WA
Last spring frost
Mar 27
First fall frost
Nov 6
Growing season
224 days
Hardiness zone
8b
Explore more for Hamilton, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Sedro-Woolley, Wa (11.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.