Weather in Grand Isle, LA
Grand Isle, Sunday, 9 August, 10:59
Overcast. Feels like 92°. High 85°, low 82°.
Monthly outlook for Grand Isle, LA: average high 87°, average low 83.1°. That is 1.4° above the climate normal for August. Precipitation is expected on 3 days (about 0.5 inches), against a normal of 9 days and 2.7 inches. The warmest day looks like 18 August (88.3°), the coolest 24 August (79.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 86.8° | 84.3° | +1.4° |
| 19 August – 28 August | 87.2° | 84.5° | +1.5° |
| 29 August – 7 September | at normal | 83.4° | — |
August records over 66 years
0.01
Grand Isle, Monday, 10 August
Light rain. High 86°, low 84°.
0.04Grand Isle, Tuesday, 11 August
Light rain. High 87°, low 84°.
0.04Grand Isle, Wednesday, 12 August
Light rain. High 87°, low 84°.
0.01Grand Isle, Thursday, 13 August
Light rain. High 87°, low 84°.
0
Grand Isle, Friday, 14 August
Clear. High 87°, low 84°.
0Grand Isle, Saturday, 15 August
Clear. High 86°, low 82°.
0
Grand Isle, Sunday, 16 August
Mostly clear. High 87°, low 82°.
0Grand Isle, Monday, 17 August
Clear. High 88°, low 83°.
0Grand Isle, Tuesday, 18 August
Mostly clear. High 88°, low 83°.
0Grand Isle, Wednesday, 19 August
Overcast. High 87°, low 83°.
0Grand Isle, Thursday, 20 August
Clear. High 88°, low 84°.
0Grand Isle, Friday, 21 August
Clear. High 87°, low 84°.
0Grand Isle, Saturday, 22 August
Clear. High 87°, low 84°.
0.01Grand Isle, Sunday, 23 August
Light rain. High 88°, low 83°.
0.22Grand Isle, Monday, 24 August
Rain. High 86°, low 79°.
0.27Grand Isle, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.23Grand Isle, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.24Grand Isle, Thursday, 27 August
Climate normal for this date — 60-year average.
0.35Grand Isle, Friday, 28 August
Climate normal for this date — 60-year average.
0.61Grand Isle, Saturday, 29 August
Climate normal for this date — 60-year average.
0.36Grand Isle, Sunday, 30 August
Climate normal for this date — 60-year average.
0.22Grand Isle, Monday, 31 August
Climate normal for this date — 60-year average.
0.37Grand Isle, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.3
Grand Isle, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.28Grand Isle, Thursday, 3 September
Climate normal for this date — 60-year average.
0.29Grand Isle, Friday, 4 September
Climate normal for this date — 60-year average.
0.39Grand Isle, Saturday, 5 September
Climate normal for this date — 60-year average.
0.3Grand Isle, Sunday, 6 September
Climate normal for this date — 60-year average.
0.22Grand Isle, Monday, 7 September
Climate normal for this date — 60-year average.
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, LA 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, LA 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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