Weather in Grand Isle, ME
Grand Isle, Sunday, 9 August, 08:19
Overcast. Feels like 69°. High 79°, low 61°.
0.14
Grand Isle, Monday, 10 August
Rain. High 78°, low 57°.
0.41Grand Isle, Tuesday, 11 August
Rain. High 71°, low 56°.
0
Grand Isle, Wednesday, 12 August
Partly cloudy. High 71°, low 51°.
1.07Grand Isle, Thursday, 13 August
Heavy rain. High 61°, low 54°.
0.15Grand Isle, Friday, 14 August
Light rain. High 56°, low 52°.
0.31Grand Isle, Saturday, 15 August
Rain. High 65°, low 52°.
0
Grand Isle, Sunday, 16 August
Clear. High 72°, low 48°.
0.16Grand Isle, Monday, 17 August
Light rain. High 64°, low 50°.
0.33Grand Isle, Tuesday, 18 August
Rain. High 62°, low 52°.
0Grand Isle, Wednesday, 19 August
Overcast. High 71°, low 49°.
0.03Grand Isle, Thursday, 20 August
Light rain. High 74°, low 52°.
0.93Grand Isle, Friday, 21 August
Rain. High 73°, low 61°.
0
Grand Isle, Saturday, 22 August
Mostly clear. High 73°, low 55°.
0Grand Isle, Sunday, 23 August
Partly cloudy. High 69°, low 48°.
0Grand Isle, Monday, 24 August
Clear. High 64°, low 42°.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Grand Isle, ME are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Grand Isle, ME since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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