Grand Isle, ME Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grand Isle, ME in one place.
Mostly sunny, with a high near 58. Southeast wind 3 to 13 mph, with gusts as high as 23 mph.
Local Weather Overview
This forecast page for Grand Isle, ME is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 16, 2026 3:08 PM EDT.
The active forecast window currently covers Apr 18 to Apr 22, 2026 for Grand Isle, ME.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 18 to Apr 22, 2026
- Latest sync
- Apr 16, 2026 3:08 PM EDT
- Forecast office
- CAR
- Source
- NOAA / NWS
Daily Outlook
This Week in Grand Isle
Saturday looks like the warmest upcoming period in Grand Isle at 58 degrees F.
Monday Night is the coolest period ahead with temperatures near 22 degrees F.
The strongest winds are forecast for Saturday at about 3 to 13 mph SE.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 16, 2026 3:08 PM EDT
- Coverage
- 5 days
- Time zone
- America/New_York
- Forecast office
- CAR
- Radar station
- KCBW
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain after 2am. Mostly cloudy, with a low around 46. South wind around 13 mph, with gusts as high as 23 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Rain. Mostly cloudy, with a high near 50. Southwest wind around 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Rain before 8pm, then rain and snow likely. Mostly cloudy, with a low around 29. Chance of precipitation is 80%.
A chance of snow. Partly sunny, with a high near 36. Chance of precipitation is 30%.
A slight chance of snow before 11pm. Partly cloudy, with a low around 22. Chance of precipitation is 20%.
Sunny, with a high near 40.
A slight chance of snow after 9pm. Partly cloudy, with a low around 28. Chance of precipitation is 20%.
A chance of snow before 8am, then a chance of rain and snow. Partly sunny, with a high near 44. Chance of precipitation is 40%.
A chance of rain before 8pm, then a slight chance of rain and snow between 8pm and 4am. Mostly cloudy, with a low around 31.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 18
|
Mostly Sunny
|
58°F |
3 to 13 mph
SE
|
|
Saturday Night
Apr 18
|
Mostly Cloudy then Chance Light Rain
|
46°F |
13 mph
S
|
|
Sunday
Apr 19
|
Light Rain
|
50°F |
13 mph
SW
|
|
Sunday Night
Apr 19
|
Rain And Snow Likely
|
29°F |
10 mph
W
|
|
Monday
Apr 20
|
Chance Light Snow
|
36°F |
12 mph
NW
|
|
Monday Night
Apr 20
|
Slight Chance Light Snow then Partly Cloudy
|
22°F |
9 mph
NW
|
|
Tuesday
Apr 21
|
Sunny
|
40°F |
10 mph
W
|
|
Tuesday Night
Apr 21
|
Slight Chance Light Snow
|
28°F |
7 mph
S
|
|
Wednesday
Apr 22
|
Chance Light Snow
|
44°F |
8 mph
S
|
|
Wednesday Night
Apr 22
|
Slight Chance Rain And Snow
|
31°F |
6 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grand Isle.