Grand Isle, ME Weather & Growing Conditions
Tonight
38°F
Rain
Rain. Cloudy. Low around 38, with temperatures rising to around 44 overnight. Southeast wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Rain | 10 mph SE | 100% |
| Wednesday | 56°F | Rain | 2 to 9 mph SW | 100% |
| Wednesday Night | 49°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph SE | 18% |
| Thursday | 63°F | Mostly Cloudy then Chance Light Rain | 5 to 8 mph S | 45% |
| Thursday Night | 53°F | Chance Light Rain | 7 mph SW | 31% |
| Friday | 61°F | Mostly Cloudy then Slight Chance Light Rain | 3 to 8 mph W | 20% |
| Friday Night | 43°F | Light Rain Likely | 5 to 8 mph N | 56% |
| Saturday | 49°F | Light Rain Likely | 8 mph NE | 72% |
| Saturday Night | 41°F | Light Rain Likely | 8 mph NE | 73% |
| Sunday | 47°F | Light Rain Likely | 9 mph W | 62% |
| Sunday Night | 36°F | Chance Light Rain | 7 mph W | 39% |
| Monday | 45°F | Slight Chance Light Rain | 5 to 8 mph W | 24% |
| Monday Night | 32°F | Chance Rain And Snow | 7 mph W | 28% |
| Tuesday | 43°F | Chance Rain And Snow | 7 to 10 mph W | 34% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grand Isle, ME
Last spring frost
May 6
First fall frost
Oct 2
Growing season
147 days
Hardiness zone
4a
Explore more for Grand Isle, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Frenchville Aroostook Ap, Me (8.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.