Weather in Long Grove, IL
Long Grove, Sunday, 9 August, 00:30
Clear. Feels like 66°. High 84°, low 64°.
Monthly outlook for Long Grove, IL: average high 78.3°, average low 62.4°. That is 0.3° above the climate normal for August. Precipitation is expected on 3 days (about 2.7 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 11 August (85.7°), the coolest 20 August (54.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 80.4° | 77.9° | +1.4° |
| 19 August – 28 August | 74.7° | 77.8° | -1.7° |
| 29 August – 7 September | at normal | 76.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (10 mi).
0.91
Long Grove, Monday, 10 August
Heavy rain. High 85°, low 70°.
0.65Long Grove, Tuesday, 11 August
Heavy rain. High 86°, low 69°.
0
Long Grove, Wednesday, 12 August
Overcast. High 81°, low 66°.
0Long Grove, Thursday, 13 August
Overcast. High 71°, low 63°.
0
Long Grove, Friday, 14 August
Clear. High 78°, low 59°.
0Long Grove, Saturday, 15 August
Overcast. High 77°, low 63°.
0Long Grove, Sunday, 16 August
Overcast. High 78°, low 61°.
0.01Long Grove, Monday, 17 August
Light rain. High 81°, low 64°.
0Long Grove, Tuesday, 18 August
Overcast. High 83°, low 67°.
0.01Long Grove, Wednesday, 19 August
Light rain. High 74°, low 61°.
0Long Grove, Thursday, 20 August
Overcast. High 68°, low 54°.
0Long Grove, Friday, 21 August
Clear. High 74°, low 55°.
0.01Long Grove, Saturday, 22 August
Light rain. High 67°, low 59°.
0
Long Grove, Sunday, 23 August
Mostly clear. High 81°, low 64°.
0Long Grove, Monday, 24 August
Overcast. High 84°, low 62°.
0.07
Long Grove, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.14
Long Grove, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.1Long Grove, Thursday, 27 August
Climate normal for this date — 60-year average.
0.12Long Grove, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Long Grove, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Long Grove, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Long Grove, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Long Grove, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Long Grove, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Long Grove, Thursday, 3 September
Climate normal for this date — 60-year average.
0.08Long Grove, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Long Grove, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Long Grove, Sunday, 6 September
Climate normal for this date — 60-year average.
0.07Long Grove, 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 Long Grove, IL 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 Long Grove, IL 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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