Weather in Summit, IL
Summit, Saturday, 8 August, 15:29
Clear. Feels like 87°. High 85°, low 69°.
Monthly outlook for Summit, IL: average high 80.2°, average low 66.5°. That is 0.1° below the climate normal for August. Precipitation is expected on 6 days (about 2.2 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 11 August (88.1°), the coolest 23 August (58.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 81.2° | 80.5° | +0.4° |
| 18 August – 27 August | 78.6° | 80.4° | -1° |
| 28 August – 6 September | at normal | 78.9° | — |
August records over 66 years
1.42
Summit, Sunday, 9 August
Heavy rain. High 84°, low 66°.
0.07Summit, Monday, 10 August
Light rain. High 84°, low 73°.
0.14Summit, Tuesday, 11 August
Light rain. High 88°, low 73°.
0.02Summit, Wednesday, 12 August
Light rain. High 86°, low 70°.
0.05Summit, Thursday, 13 August
Light rain. High 72°, low 65°.
0Summit, Friday, 14 August
Clear. High 76°, low 62°.
0
Summit, Saturday, 15 August
Overcast. High 79°, low 61°.
0
Summit, Sunday, 16 August
Mostly clear. High 80°, low 62°.
0.08Summit, Monday, 17 August
Light rain. High 78°, low 69°.
0.01Summit, Tuesday, 18 August
Light rain. High 85°, low 71°.
0.38Summit, Wednesday, 19 August
Rain. High 86°, low 68°.
0.04Summit, Thursday, 20 August
Light rain. High 78°, low 69°.
0
Summit, Friday, 21 August
Partly cloudy. High 80°, low 66°.
0.01Summit, Saturday, 22 August
Light rain. High 75°, low 62°.
0Summit, Sunday, 23 August
Mostly clear. High 67°, low 58°.
0.13Summit, Monday, 24 August
Climate normal for this date — 60-year average.
0.08Summit, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.16
Summit, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Summit, Thursday, 27 August
Climate normal for this date — 60-year average.
0.14Summit, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Summit, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Summit, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Summit, Monday, 31 August
Climate normal for this date — 60-year average.
0.13Summit, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Summit, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Summit, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Summit, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Summit, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Summit, Sunday, 6 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 Summit, 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 Summit, 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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