Custer, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Custer, a community in Whatcom County, Washington.
Overnight
53°F
Mostly Clear
Mostly clear, with a low around 53. Wind around 0 mph.
7-day forecast for Custer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 84°F | Sunny then Patchy Smoke | 0 to 6 mph WNW | 0% |
| Tuesday Night | 56°F | Patchy Smoke then Mostly Clear | 0 to 5 mph WSW | 0% |
| Wednesday | 86°F | Sunny then Patchy Smoke | 0 to 6 mph WNW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 0 to 6 mph SSW | 0% |
| Thursday | 84°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 59°F | Mostly Clear | 1 to 5 mph SSW | 0% |
| Friday | 81°F | Sunny | 2 to 6 mph SSW | 0% |
| Friday Night | 58°F | Mostly Clear | 1 to 6 mph S | 0% |
| Saturday | 78°F | Mostly Sunny | 1 to 7 mph SSW | 0% |
| Saturday Night | 56°F | Mostly Clear | 2 to 6 mph S | 0% |
| Sunday | 75°F | Mostly Sunny | 2 to 7 mph SSW | 0% |
| Sunday Night | 55°F | Mostly Clear | 1 to 6 mph S | 2% |
| Monday | 75°F | Mostly Sunny | 1 to 6 mph SSW | 2% |
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 Aug 4, 2026.