Birch Bay, WA Weather & Growing Conditions
Tonight
37°F
Partly Cloudy then Patchy Fog
Patchy fog after 4am. Partly cloudy, with a low around 37. East northeast wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 37°F | Partly Cloudy then Patchy Fog | 1 mph ENE | 1% |
| Wednesday | 56°F | Partly Sunny then Light Rain Likely | 1 to 6 mph SE | 60% |
| Wednesday Night | 46°F | Light Rain | 8 to 12 mph S | 91% |
| Thursday | 56°F | Mostly Sunny then Slight Chance Light Rain | 9 mph S | 16% |
| Thursday Night | 45°F | Light Rain | 7 to 13 mph SE | 95% |
| Friday | 54°F | Light Rain | 9 to 16 mph SE | 95% |
| Friday Night | 45°F | Light Rain Likely | 3 to 9 mph ESE | 70% |
| Saturday | 59°F | Light Rain Likely | 6 mph E | 55% |
| Saturday Night | 48°F | Light Rain | 6 to 17 mph SSE | 87% |
| Sunday | 55°F | Light Rain Likely | 6 to 12 mph SSW | 61% |
| Sunday Night | 41°F | Slight Chance Light Rain | 6 mph ESE | 15% |
| Monday | 54°F | Chance Light Rain | 5 mph E | 46% |
| Monday Night | 45°F | Light Rain Likely | 5 to 9 mph ESE | 71% |
| Tuesday | 56°F | Light Rain Likely | 12 mph ESE | 71% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Birch Bay, WA
Last spring frost
Mar 31
First fall frost
Nov 4
Growing season
219 days
Hardiness zone
8b
Explore more for Birch Bay, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Blaine, Wa (4.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.