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Custer, WA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Custer, a community in Whatcom County, Washington.

Tonight
51°F
Partly Cloudy
Partly cloudy, with a low around 51. South southeast wind around 3 mph.

7-day forecast for Custer

WhenTempForecastWindPrecip
Tonight 51°F Partly Cloudy 3 mph SSE 0%
Saturday 70°F Partly Sunny 3 mph S 0%
Saturday Night 50°F Partly Cloudy 2 mph SSE 0%
Sunday 71°F Mostly Sunny 0 to 5 mph SW 0%
Sunday Night 51°F Partly Cloudy 1 to 5 mph S 0%
Monday 70°F Mostly Sunny 1 to 5 mph S 1%
Monday Night 50°F Partly Cloudy 0 to 5 mph S 0%
Tuesday 68°F Mostly Sunny 0 to 5 mph S 1%
Tuesday Night 50°F Partly Cloudy 5 mph SSE 7%
Wednesday 67°F Partly Sunny 3 mph S 7%
Wednesday Night 51°F Mostly Cloudy 0 to 3 mph NNE 12%
Thursday 69°F Partly Sunny then Slight Chance Light Rain 0 to 5 mph NNW 21%
Thursday Night 52°F Chance Light Rain 5 mph SSW 34%
Friday 67°F Chance Light Rain 2 to 6 mph S 34%

Forecast source: National Weather Service (api.weather.gov) for Custer (48.913, -122.637). Updated through the day.

Growing snapshot for Custer

Last spring frost
Mar 31
First fall frost
Nov 4
Growing season
219 days
Hardiness zone
8b

More local growing data for Custer: nearby ZIP 98240 weather · frost dates · planting calendar · Washington frost dates

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Climate data from the nearest NOAA station, Blaine, Wa (8.1 mi from Custer). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.