Belfast, ME Weather & Growing Conditions
Tonight
48°F
Chance Rain Showers
A chance of rain showers before 4am. Cloudy, with a low around 48. Southeast wind 0 to 5 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Chance Rain Showers | 0 to 5 mph SE | 48% |
| Wednesday | 69°F | Partly Sunny | 5 mph SW | 9% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph S | 5% |
| Thursday | 67°F | Partly Sunny | 5 to 10 mph SW | 11% |
| Thursday Night | 56°F | Mostly Cloudy | 5 to 10 mph SW | 14% |
| Friday | 65°F | Light Rain Likely | 0 to 5 mph S | 56% |
| Friday Night | 50°F | Light Rain | 0 to 10 mph NE | 86% |
| Saturday | 56°F | Light Rain | 10 mph NE | 82% |
| Saturday Night | 44°F | Light Rain Likely | 10 mph N | 67% |
| Sunday | 54°F | Chance Light Rain | 5 to 10 mph NW | 48% |
| Sunday Night | 38°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph W | 24% |
| Monday | 51°F | Slight Chance Light Rain | 5 to 10 mph W | 18% |
| Monday Night | 35°F | Slight Chance Light Rain | 10 mph W | 22% |
| Tuesday | 50°F | Slight Chance Light Rain | 10 mph W | 21% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Belfast, ME
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5a
Explore more for Belfast, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Belfast, Me (15.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.