Grand Isle, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Isle, a community in Aroostook County, Maine.
Today
55°F
Light Rain
Rain and patchy fog. Mostly cloudy, with a high near 55. East wind around 3 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Grand Isle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 55°F | Light Rain | 3 mph E | 80% |
| Tonight | 48°F | Slight Chance Light Rain then Mostly Cloudy | 3 mph SE | 22% |
| Thursday | 63°F | Mostly Cloudy then Chance Light Rain | 3 to 8 mph S | 49% |
| Thursday Night | 52°F | Chance Light Rain | 7 mph S | 33% |
| Friday | 63°F | Slight Chance Light Rain then Partly Sunny | 3 to 8 mph W | 9% |
| Friday Night | 41°F | Mostly Cloudy then Chance Light Rain | 6 mph N | 45% |
| Saturday | 49°F | Light Rain | 8 mph NE | 75% |
| Saturday Night | 39°F | Light Rain Likely | 7 mph NE | 69% |
| Sunday | 48°F | Light Rain Likely | 8 mph N | 65% |
| Sunday Night | 34°F | Chance Light Rain | 6 mph W | 39% |
| Monday | 45°F | Chance Light Rain | 5 to 9 mph W | 28% |
| Monday Night | 31°F | Chance Light Rain then Mostly Cloudy | 7 mph W | 25% |
| Tuesday | 43°F | Chance Rain And Snow | 6 to 10 mph W | 28% |
| Tuesday Night | 30°F | Slight Chance Rain And Snow | 7 mph W | 27% |
Forecast source: National Weather Service (api.weather.gov) for Grand Isle (47.307, -68.159). Updated through the day.
Growing snapshot for Grand Isle
Last spring frost
May 6
First fall frost
Oct 2
Growing season
147 days
Hardiness zone
4a
More local growing data for Grand Isle: nearby ZIP 04746 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Ashland
Blaine
Caribou
Eagle Lake
Fort Fairfield
Fort Kent
Houlton
Island Falls
Limestone
Madawaska
Mapleton
Mars Hill
Oakfield
Presque Isle
Van Buren
Washburn
Climate data from the nearest NOAA station, Frenchville Aroostook Ap, Me (8.3 mi from Grand Isle). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.