Belfast, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belfast, a city in Waldo County, Maine.
Today
86°F
Sunny
Sunny, with a high near 86. West wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast for Belfast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 10 to 15 mph W | 0% |
| Tonight | 62°F | Clear | 0 to 10 mph W | 1% |
| Wednesday | 87°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 64°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Thursday | 89°F | Sunny | 0 to 5 mph S | 3% |
| Thursday Night | 68°F | Partly Cloudy | 0 to 5 mph S | 3% |
| Friday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 23% |
| Friday Night | 67°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 24% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 34% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 31% |
| Sunday | 86°F | Sunny | 0 to 5 mph SW | 10% |
| Sunday Night | 66°F | Mostly Clear | 0 to 5 mph SW | 10% |
| Monday | 86°F | Mostly Sunny then Slight Chance Rain Showers | 0 to 10 mph W | 16% |
| Monday Night | 64°F | Slight Chance Rain Showers | 5 to 10 mph W | 19% |
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 Aug 4, 2026.