Grand Isle, ME Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grand Isle, ME in one place.
Partly sunny, with a high near 72. Southwest wind 7 to 10 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: Sep 15, 2026 3:55 PM EDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for Grand Isle, ME.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 3:55 PM EDT
- Forecast office
- CAR
- Source
- NOAA / NWS
Daily Outlook
This Week in Grand Isle
Wednesday looks like the warmest upcoming period in Grand Isle at 72 degrees F.
Friday Night is the coolest period ahead with temperatures near 39 degrees F.
The strongest winds are forecast for Friday at about 6 to 20 mph NW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 3:55 PM EDT
- Coverage
- 6 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
Partly cloudy, with a low around 46. Northwest wind around 7 mph.
Mostly sunny, with a high near 64. East wind 1 to 5 mph.
A slight chance of rain showers between 10pm and 1am, then patchy fog. Mostly cloudy, with a low around 47. South wind around 5 mph. Chance of precipitation is 20%.
Patchy fog before 8am. Sunny, with a high near 60. Northwest wind 6 to 20 mph, with gusts as high as 33 mph.
Mostly clear, with a low around 39.
Sunny, with a high near 57.
A chance of rain showers after midnight. Mostly cloudy, with a low around 40. Chance of precipitation is 30%.
Rain showers likely. Mostly cloudy, with a high near 56. Chance of precipitation is 60%.
A chance of rain showers before 10pm. Mostly cloudy, with a low around 41. Chance of precipitation is 50%.
Mostly sunny, with a high near 59.
Partly cloudy, with a low around 40.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Partly Sunny
|
72°F |
7 to 10 mph
SW
|
|
Wednesday Night
Sep 16
|
Partly Cloudy
|
46°F |
7 mph
NW
|
|
Thursday
Sep 17
|
Mostly Sunny
|
64°F |
1 to 5 mph
E
|
|
Thursday Night
Sep 17
|
Slight Chance Rain Showers
|
47°F |
5 mph
S
|
|
Friday
Sep 18
|
Patchy Fog then Sunny
|
60°F |
6 to 20 mph
NW
|
|
Friday Night
Sep 18
|
Mostly Clear
|
39°F |
8 to 17 mph
NW
|
|
Saturday
Sep 19
|
Sunny
|
57°F |
5 to 8 mph
NW
|
|
Saturday Night
Sep 19
|
Mostly Cloudy then Chance Rain Showers
|
40°F |
5 mph
E
|
|
Sunday
Sep 20
|
Rain Showers Likely
|
56°F |
5 to 9 mph
S
|
|
Sunday Night
Sep 20
|
Chance Rain Showers then Mostly Cloudy
|
41°F |
8 mph
W
|
|
Monday
Sep 21
|
Mostly Sunny
|
59°F |
9 mph
NW
|
|
Monday Night
Sep 21
|
Partly Cloudy
|
40°F |
7 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grand Isle.