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
58°F
Partly Sunny then Chance Light Rain
A chance of rain after 4pm. Partly sunny. High near 58, with temperatures falling to around 53 in the afternoon. Southeast wind 0 to 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sudden Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 58°F | Partly Sunny then Chance Light Rain | 0 to 8 mph SE | 27% |
| Tonight | 46°F | Light Rain | 10 mph SSE | 89% |
| Thursday | 55°F | Partly Sunny | 8 mph SSE | 10% |
| Thursday Night | 45°F | Light Rain | 6 to 14 mph SE | 95% |
| Friday | 53°F | Light Rain | 6 to 16 mph SE | 95% |
| Friday Night | 46°F | Light Rain Likely | 2 to 6 mph ESE | 73% |
| Saturday | 61°F | Chance Light Rain | 3 mph ESE | 34% |
| Saturday Night | 47°F | Light Rain | 3 to 15 mph SSE | 85% |
| Sunday | 54°F | Light Rain | 1 to 13 mph S | 78% |
| Sunday Night | 40°F | Slight Chance Light Rain | 3 mph ESE | 22% |
| Monday | 54°F | Chance Light Rain | 3 mph E | 46% |
| Monday Night | 46°F | Light Rain Likely | 1 to 12 mph SE | 66% |
| Tuesday | 56°F | Light Rain Likely | 6 to 12 mph SE | 66% |
| Tuesday Night | 46°F | Light Rain Likely | 6 to 9 mph SE | 59% |
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 4, 2026.