Monthly weather forecast and climate
Birch Bay, WA

Average sea temperature - Birch Bay, WA

Best months for swimming (with the highest average sea temperature) are August and September (52.6°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).

Average daylight - Birch Bay, WA

The month with the longest days is June (Average daylight: 16.1h).
The month with shortest days is December (Average daylight: 8.3h).