Grand Isle, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Isle, a community in Aroostook County, Maine.
This Afternoon
56°F
Sunny
Sunny, with a high near 56. Northwest wind 6 to 10 mph.
7-day forecast for Grand Isle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Sunny | 6 to 10 mph NW | 0% |
| Tonight | 36°F | Mostly Cloudy then Patchy Frost | 0 to 3 mph NE | 1% |
| Sunday | 55°F | Cloudy then Light Rain Likely | 3 to 8 mph SE | 67% |
| Sunday Night | 40°F | Light Rain Likely | 5 mph SW | 62% |
| Monday | 56°F | Patchy Fog then Partly Sunny | 3 to 12 mph NW | 2% |
| Monday Night | 36°F | Partly Cloudy | 3 to 9 mph NW | 0% |
| Tuesday | 60°F | Patchy Frost then Sunny | 7 mph NW | 0% |
| Tuesday Night | 34°F | Mostly Clear | 2 to 6 mph N | 0% |
| Wednesday | 63°F | Sunny | 2 mph NW | 0% |
| Wednesday Night | 36°F | Clear | 2 mph NW | 0% |
| Thursday | 68°F | Sunny | 2 mph NW | 0% |
| Thursday Night | 38°F | Mostly Clear | 2 mph N | 2% |
| Friday | 68°F | Mostly Sunny then Slight Chance Rain Showers | 5 mph NE | 16% |
| Friday Night | 41°F | Slight Chance Rain Showers | 5 mph NE | 17% |
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 Sep 19, 2026.