Custer, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Custer, a community in Whatcom County, Washington.
This Afternoon
54°F
Mostly Cloudy
Mostly cloudy. High near 54, with temperatures falling to around 51 in the afternoon. West wind around 1 mph.
7-day forecast for Custer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 54°F | Mostly Cloudy | 1 mph W | 6% |
| Tonight | 37°F | Partly Cloudy then Patchy Fog | 1 mph NE | 6% |
| Wednesday | 57°F | Partly Sunny then Chance Light Rain | 2 mph ESE | 27% |
| Wednesday Night | 47°F | Light Rain | 2 to 13 mph SSE | 91% |
| Thursday | 56°F | Chance Light Rain | 6 to 10 mph S | 33% |
| Thursday Night | 47°F | Light Rain | 6 to 18 mph SE | 88% |
| Friday | 55°F | Light Rain | 9 to 20 mph SSE | 88% |
| Friday Night | 45°F | Chance Light Rain | 5 to 9 mph ESE | 44% |
| Saturday | 59°F | Chance Light Rain | 5 to 8 mph ESE | 49% |
| Saturday Night | 48°F | Light Rain | 8 to 21 mph SSE | 82% |
| Sunday | 55°F | Light Rain Likely | 6 to 16 mph S | 71% |
| Sunday Night | 42°F | Chance Light Rain | 6 mph SE | 31% |
| Monday | 54°F | Light Rain Likely | 5 to 8 mph E | 57% |
| Monday Night | 46°F | Light Rain | 8 to 14 mph ESE | 78% |
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
Nearby towns & communities
Acme
Bellingham
Birch Bay
Blaine
Deming
Everson
Ferndale
Geneva
Glacier
Kendall
Lynden
Maple Falls
Marietta-Alderwood
Nooksack
Peaceful Valley
Point Roberts
Sudden Valley
Sumas
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 Nov 4, 2026.