Belfast, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belfast, a city in Waldo County, Maine.
Tonight
49°F
Chance Rain Showers
A chance of rain showers before 4am. Cloudy, with a low around 49. 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 for Belfast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Chance Rain Showers | 0 to 5 mph SE | 46% |
| Wednesday | 71°F | Partly Sunny | 0 to 5 mph SW | 9% |
| Wednesday Night | 50°F | Partly Cloudy | 0 mph | 4% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph SW | 8% |
| Thursday Night | 57°F | Mostly Cloudy then Isolated Rain Showers | 5 to 10 mph SW | 17% |
| Friday | 67°F | Light Rain Likely | 0 to 5 mph S | 59% |
| Friday Night | 51°F | Light Rain | 0 to 5 mph E | 85% |
| Saturday | 57°F | Light Rain | 5 to 10 mph NE | 83% |
| Saturday Night | 45°F | Light Rain Likely | 5 mph N | 70% |
| Sunday | 56°F | Chance Light Rain | 5 to 10 mph NW | 49% |
| Sunday Night | 38°F | Chance Light Rain then Mostly Cloudy | 5 mph W | 27% |
| Monday | 53°F | Slight Chance Light Rain | 5 to 10 mph NW | 20% |
| Monday Night | 35°F | Slight Chance Light Rain | 5 to 10 mph NW | 23% |
| Tuesday | 52°F | Slight Chance Light Rain | 10 to 15 mph W | 22% |
Forecast source: National Weather Service (api.weather.gov) for Belfast (44.426, -69.026). Updated through the day.
Growing snapshot for Belfast
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5b
More local growing data for Belfast: nearby ZIP 04915 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Belfast, Me (5.3 mi from Belfast). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.