Belfast
Maine, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Belfast, ME

Average sea temperature in September - Belfast, ME
  • Average sea temperature in September: 14.6°C

The best month for swimming (with the highest average sea temperature) is August (15.8°C).
The coldest month (with the lowest average sea temperature) is March (3.3°C).

Average daylight in September - Belfast, ME
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.5h).
The month with shortest days is December (Average daylight: 8.9h).