Grand Isle, ME Weather Forecast
Local 7-day forecast
Mostly Cloudy then Widespread Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Grand Isle, ME in one place.
A chance of rain showers between noon and 5pm, then widespread showers and thunderstorms. Mostly cloudy. High near 71, with temperatures falling to around 64 in the afternoon. South wind 5 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
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: Jul 17, 2026 6:29 PM EDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Grand Isle, ME.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 6:29 PM EDT
- Forecast office
- CAR
- Source
- NOAA / NWS
Daily Outlook
This Week in Grand Isle
Tuesday looks like the warmest upcoming period in Grand Isle at 78 degrees F.
Sunday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Sunday at about 12 to 16 mph W.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 6:29 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
Showers and thunderstorms before 10pm, then patchy smoke and showers and thunderstorms between 10pm and 4am, then patchy smoke and scattered rain showers. Cloudy, with a low around 55. South wind around 10 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Rain showers likely before 2pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 68. West wind 12 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 52. West wind 10 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Sunny, with a high near 73. West wind 7 to 10 mph.
Partly cloudy, with a low around 54.
Mostly sunny, with a high near 78.
Rain showers likely before 2am, then showers and thunderstorms likely. Mostly cloudy, with a low around 58. Chance of precipitation is 70%.
Showers and thunderstorms. Mostly cloudy, with a high near 75. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 80%.
A chance of rain showers. Partly sunny, with a high near 74. Chance of precipitation is 40%.
A chance of rain showers before 9pm. Partly cloudy, with a low around 56.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Mostly Cloudy then Widespread Showers And Thunderstorms
|
71°F |
5 to 9 mph
S
|
|
Saturday Night
Jul 18
|
Showers And Thunderstorms
|
55°F |
10 mph
S
|
|
Sunday
Jul 19
|
Rain Showers Likely
|
68°F |
12 to 16 mph
W
|
|
Sunday Night
Jul 19
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
52°F |
10 to 14 mph
W
|
|
Monday
Jul 20
|
Sunny
|
73°F |
7 to 10 mph
W
|
|
Monday Night
Jul 20
|
Partly Cloudy
|
54°F |
3 to 7 mph
SW
|
|
Tuesday
Jul 21
|
Mostly Sunny
|
78°F |
7 to 15 mph
S
|
|
Tuesday Night
Jul 21
|
Rain Showers Likely
|
58°F |
14 mph
S
|
|
Wednesday
Jul 22
|
Showers And Thunderstorms
|
75°F |
12 mph
S
|
|
Wednesday Night
Jul 22
|
Showers And Thunderstorms
|
59°F |
9 mph
S
|
|
Thursday
Jul 23
|
Chance Rain Showers
|
74°F |
7 to 10 mph
SW
|
|
Thursday Night
Jul 23
|
Chance Rain Showers then Partly Cloudy
|
56°F |
3 to 7 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grand Isle.