Hamilton, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton, a town in Skagit County, Washington.
This Afternoon
59°F
Mostly Cloudy
Mostly cloudy. High near 59, with temperatures falling to around 54 in the afternoon. Wind around 0 mph.
7-day forecast for Hamilton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Mostly Cloudy | 0 mph | 4% |
| Tonight | 41°F | Partly Cloudy | 2 to 6 mph NNE | 5% |
| Wednesday | 60°F | Mostly Sunny | 5 mph SE | 12% |
| Wednesday Night | 46°F | Light Rain | 2 to 10 mph SE | 100% |
| Thursday | 55°F | Light Rain Likely | 3 mph SSE | 66% |
| Thursday Night | 45°F | Light Rain | 3 to 12 mph SE | 94% |
| Friday | 54°F | Light Rain | 5 to 12 mph ESE | 94% |
| Friday Night | 45°F | Chance Light Rain | 5 to 8 mph ESE | 49% |
| Saturday | 60°F | Chance Light Rain | 7 to 12 mph ESE | 39% |
| Saturday Night | 47°F | Light Rain | 10 to 15 mph SSE | 87% |
| Sunday | 55°F | Light Rain | 2 to 12 mph S | 87% |
| Sunday Night | 41°F | Chance Light Rain | 2 to 9 mph ESE | 42% |
| Monday | 55°F | Light Rain Likely | 9 mph E | 55% |
| Monday Night | 45°F | Light Rain | 7 to 14 mph ESE | 77% |
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 Nov 4, 2026.