Birch Bay, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Birch Bay, a community in Whatcom County, Washington.
Overnight
56°F
Mostly Clear
Mostly clear, with a low around 56. North northwest wind around 2 mph.
7-day forecast for Birch Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Mostly Clear | 2 mph NNW | 0% |
| Tuesday | 73°F | Sunny | 2 to 7 mph NW | 0% |
| Tuesday Night | 58°F | Mostly Clear | 1 to 6 mph WNW | 0% |
| Wednesday | 75°F | Sunny | 1 to 6 mph WNW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 1 to 6 mph WNW | 0% |
| Thursday | 74°F | Sunny | 1 to 6 mph NW | 0% |
| Thursday Night | 60°F | Mostly Clear | 5 mph SSW | 0% |
| Friday | 74°F | Sunny | 6 mph S | 0% |
| Friday Night | 59°F | Mostly Clear | 1 to 5 mph S | 0% |
| Saturday | 73°F | Sunny | 1 to 6 mph S | 0% |
| Saturday Night | 57°F | Mostly Clear | 5 mph S | 0% |
| Sunday | 71°F | Mostly Sunny | 6 mph SSW | 0% |
| Sunday Night | 56°F | Mostly Clear | 1 to 5 mph SSW | 1% |
| Monday | 71°F | Mostly Sunny | 2 to 6 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Birch Bay (48.923, -122.745). Updated through the day.
Growing snapshot for Birch Bay
Last spring frost
Mar 31
First fall frost
Nov 4
Growing season
219 days
Hardiness zone
8b
More local growing data for Birch Bay: nearby ZIP 98230 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Acme
Bellingham
Blaine
Custer
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 (4.3 mi from Birch Bay). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.