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
53°F
Mostly Cloudy
Mostly cloudy, with a low around 53. East southeast wind around 2 mph.
7-day forecast for Birch Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Cloudy | 2 mph ESE | 0% |
| Saturday | 64°F | Partly Sunny | 5 mph S | 0% |
| Saturday Night | 52°F | Partly Cloudy | 2 mph SE | 0% |
| Sunday | 64°F | Partly Sunny | 1 to 5 mph W | 0% |
| Sunday Night | 53°F | Partly Cloudy | 3 mph SSW | 0% |
| Monday | 65°F | Mostly Sunny | 1 to 5 mph SSE | 0% |
| Monday Night | 53°F | Partly Cloudy | 3 mph SSE | 0% |
| Tuesday | 64°F | Partly Sunny | 1 to 5 mph SSE | 0% |
| Tuesday Night | 52°F | Mostly Cloudy then Slight Chance Light Rain | 5 mph SSE | 16% |
| Wednesday | 64°F | Slight Chance Light Rain then Partly Sunny | 6 mph S | 16% |
| Wednesday Night | 52°F | Mostly Cloudy | 3 mph ESE | 12% |
| Thursday | 64°F | Partly Sunny | 2 to 6 mph N | 13% |
| Thursday Night | 51°F | Slight Chance Light Rain | 6 mph WNW | 19% |
| Friday | 64°F | Slight Chance Light Rain then Mostly Sunny | 3 to 7 mph WNW | 19% |
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 Sep 19, 2026.