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
55°F
Mostly Cloudy
Mostly cloudy. High near 55, with temperatures falling to around 50 in the afternoon. Wind around 0 mph.
7-day forecast for Sudden Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 55°F | Mostly Cloudy | 0 mph | 6% |
| Tonight | 40°F | Partly Cloudy | 1 mph NE | 5% |
| Wednesday | 58°F | Mostly Sunny then Slight Chance Light Rain | 1 mph E | 15% |
| Wednesday Night | 47°F | Light Rain | 1 to 7 mph SSE | 99% |
| Thursday | 55°F | Chance Light Rain then Partly Sunny | 2 to 6 mph SSE | 47% |
| Thursday Night | 46°F | Light Rain | 2 to 13 mph SE | 88% |
| Friday | 53°F | Light Rain | 5 to 13 mph SE | 88% |
| Friday Night | 45°F | Chance Light Rain | 6 mph ESE | 45% |
| Saturday | 59°F | Chance Light Rain | 5 mph ESE | 38% |
| Saturday Night | 48°F | Light Rain | 5 to 14 mph SSE | 79% |
| Sunday | 54°F | Light Rain | 2 to 13 mph S | 79% |
| Sunday Night | 42°F | Chance Light Rain | 3 mph ESE | 32% |
| Monday | 54°F | Chance Light Rain | 3 mph ESE | 54% |
| Monday Night | 46°F | Light Rain Likely | 3 to 12 mph SE | 74% |
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 Nov 3, 2026.