Sudden Valley, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sudden Valley, a community in Whatcom County, Washington.
Today
71°F
Partly Sunny
Partly sunny. High near 71, with temperatures falling to around 69 in the afternoon. West southwest wind around 1 mph.
7-day forecast for Sudden Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Partly Sunny | 1 mph WSW | 0% |
| Tonight | 51°F | Mostly Clear | 0 mph | 0% |
| Sunday | 73°F | Mostly Sunny | 1 mph WSW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 1 mph NW | 0% |
| Monday | 71°F | Mostly Sunny | 2 mph S | 0% |
| Monday Night | 51°F | Partly Cloudy | 1 mph NNW | 0% |
| Tuesday | 68°F | Partly Sunny | 2 mph SSW | 0% |
| Tuesday Night | 50°F | Mostly Cloudy | 3 mph S | 10% |
| Wednesday | 67°F | Slight Chance Light Rain | 2 mph S | 16% |
| Wednesday Night | 50°F | Slight Chance Light Rain then Mostly Cloudy | 1 mph NNE | 16% |
| Thursday | 66°F | Mostly Cloudy | 2 mph N | 14% |
| Thursday Night | 49°F | Chance Light Rain | 2 mph NW | 25% |
| Friday | 65°F | Chance Light Rain | 2 mph WNW | 25% |
| Friday Night | 48°F | Partly Cloudy | 2 mph NE | 14% |
Forecast source: National Weather Service (api.weather.gov) for Sudden Valley (48.723, -122.344). Updated through the day.
Growing snapshot for Sudden Valley
Last spring frost
Apr 1
First fall frost
Nov 2
Growing season
216 days
Hardiness zone
8a
More local growing data for Sudden Valley: nearby ZIP 98229 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Acme
Bellingham
Birch Bay
Blaine
Custer
Deming
Everson
Ferndale
Geneva
Glacier
Kendall
Lynden
Maple Falls
Marietta-Alderwood
Nooksack
Peaceful Valley
Point Roberts
Sumas
Climate data from the nearest NOAA station, Bellingham 3 Ssw, Wa (5.2 mi from Sudden Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.