Hamilton, WA Weather & Growing Conditions
Tonight
53°F
Partly Cloudy
Partly cloudy, with a low around 53. South wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Partly Cloudy | 0 to 3 mph S | 1% |
| Saturday | 75°F | Partly Sunny | 0 to 5 mph WSW | 1% |
| Saturday Night | 54°F | Partly Cloudy | 1 to 5 mph SSE | 0% |
| Sunday | 77°F | Sunny | 0 to 5 mph N | 0% |
| Sunday Night | 54°F | Mostly Clear | 0 to 5 mph E | 0% |
| Monday | 73°F | Mostly Sunny | 1 to 6 mph SSW | 1% |
| Monday Night | 51°F | Partly Cloudy | 0 to 6 mph ENE | 1% |
| Tuesday | 70°F | Mostly Sunny | 1 to 7 mph SSW | 1% |
| Tuesday Night | 49°F | Partly Cloudy | 0 to 6 mph E | 4% |
| Wednesday | 70°F | Partly Sunny | 0 to 3 mph NW | 8% |
| Wednesday Night | 51°F | Mostly Cloudy | 1 to 6 mph NW | 11% |
| Thursday | 72°F | Slight Chance Light Rain | 1 to 5 mph SSE | 18% |
| Thursday Night | 53°F | Chance Light Rain | 2 to 7 mph SSE | 37% |
| Friday | 68°F | Chance Light Rain | 5 mph S | 37% |
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 Sep 19, 2026.