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
76°F
Sunny
Sunny, with a high near 76. West wind 14 to 21 mph, with gusts as high as 43 mph.
7-day forecast for Grand Isle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Sunny | 14 to 21 mph W | 11% |
| Tonight | 59°F | Mostly Clear | 3 to 12 mph W | 2% |
| Wednesday | 88°F | Sunny | 3 to 7 mph SW | 1% |
| Wednesday Night | 56°F | Mostly Clear | 1 to 6 mph W | 0% |
| Thursday | 85°F | Sunny | 3 mph W | 0% |
| Thursday Night | 61°F | Partly Cloudy | 2 mph S | 9% |
| Friday | 83°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 5 mph SW | 53% |
| Friday Night | 61°F | Chance Showers And Thunderstorms | 3 mph W | 48% |
| Saturday | 84°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 mph W | 19% |
| Saturday Night | 61°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph W | 15% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 1 to 7 mph SW | 35% |
| Sunday Night | 60°F | Chance Showers And Thunderstorms | 5 mph SW | 39% |
| Monday | 80°F | Chance Rain Showers | 5 to 9 mph W | 51% |
| Monday Night | 56°F | Chance Showers And Thunderstorms | 6 mph W | 47% |
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 Aug 4, 2026.