Hamilton, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a town in Skagit County, Washington.
Overnight
53°F
Mostly Cloudy
Mostly cloudy, with a low around 53. West southwest wind around 2 mph.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Cloudy | 2 mph WSW | 0% |
| Saturday | 75°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Saturday Night | 54°F | Mostly Clear | 0 to 6 mph W | 0% |
| Sunday | 77°F | Mostly Sunny | 1 to 5 mph W | 0% |
| Sunday Night | 53°F | Partly Cloudy | 0 to 3 mph ENE | 0% |
| Monday | 73°F | Mostly Sunny | 1 to 6 mph SSW | 0% |
| Monday Night | 52°F | Partly Cloudy | 0 to 6 mph ESE | 0% |
| Tuesday | 70°F | Mostly Sunny | 1 to 6 mph S | 0% |
| Tuesday Night | 50°F | Mostly Cloudy | 0 to 6 mph E | 12% |
| Wednesday | 69°F | Partly Sunny then Slight Chance Light Rain | 0 to 5 mph S | 19% |
| Wednesday Night | 51°F | Slight Chance Light Rain then Mostly Cloudy | 0 to 3 mph ENE | 19% |
| Thursday | 68°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 5 mph NE | 18% |
| Thursday Night | 50°F | Chance Light Rain | 1 to 5 mph SSW | 28% |
| Friday | 67°F | Chance Light Rain | 0 to 5 mph SSW | 28% |
Forecast source: National Weather Service (api.weather.gov) for Hamilton (48.522, -121.995). Updated through the day.
Growing snapshot for Hamilton
Last spring frost
Mar 27
First fall frost
Nov 6
Growing season
224 days
Hardiness zone
8b
More local growing data for Hamilton: nearby ZIP 98255 weather · frost dates · planting calendar · Washington frost dates
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Sedro-Woolley
Climate data from the nearest NOAA station, Sedro-Woolley, Wa (11.3 mi from Hamilton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.