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
41°F
Partly Cloudy
Partly cloudy, with a low around 41. East wind around 2 mph.
7-day forecast for Birch Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Partly Cloudy | 2 mph E | 1% |
| Wednesday | 54°F | Partly Sunny then Light Rain Likely | 2 to 9 mph SE | 65% |
| Wednesday Night | 48°F | Light Rain | 12 to 16 mph S | 94% |
| Thursday | 54°F | Mostly Sunny then Slight Chance Light Rain | 9 to 14 mph S | 16% |
| Thursday Night | 47°F | Light Rain | 9 to 21 mph SE | 95% |
| Friday | 53°F | Light Rain | 14 to 23 mph SE | 95% |
| Friday Night | 47°F | Light Rain Likely | 6 to 14 mph ESE | 69% |
| Saturday | 57°F | Chance Light Rain | 8 mph E | 54% |
| Saturday Night | 48°F | Light Rain | 8 to 21 mph SSE | 86% |
| Sunday | 54°F | Light Rain Likely | 6 to 17 mph SSW | 60% |
| Sunday Night | 42°F | Slight Chance Light Rain | 6 mph SE | 15% |
| Monday | 53°F | Chance Light Rain | 6 mph E | 47% |
| Monday Night | 46°F | Light Rain Likely | 6 to 16 mph ESE | 71% |
| Tuesday | 55°F | Light Rain Likely | 12 to 18 mph SE | 71% |
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 Nov 4, 2026.