Weather in Prairie du Rocher, IL
Prairie du Rocher, Sunday, 9 August, 13:58
Clear. Feels like 104°. High 93°, low 72°.
Monthly outlook for Prairie du Rocher, IL: average high 101.7°, average low 74.9°. That is 8.5° above the climate normal for August. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 4 days and 1.5 inches. The warmest day looks like 18 August (108.3°), the coolest 22 August (66.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 101.9° | 86.4° | +8.6° |
| 19 August – 28 August | 101.2° | 86.7° | +8.1° |
| 29 August – 7 September | at normal | 84.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Red Bud (10 mi).
0
Prairie du Rocher, Monday, 10 August
Overcast. High 100°, low 76°.
0
Prairie du Rocher, Tuesday, 11 August
Mostly clear. High 104°, low 78°.
0.19
Prairie du Rocher, Wednesday, 12 August
Rain. High 92°, low 70°.
0.12Prairie du Rocher, Thursday, 13 August
Light rain. High 99°, low 71°.
0Prairie du Rocher, Friday, 14 August
Overcast. High 106°, low 77°.
0Prairie du Rocher, Saturday, 15 August
Clear. High 106°, low 81°.
0Prairie du Rocher, Sunday, 16 August
Clear. High 104°, low 80°.
0.04Prairie du Rocher, Monday, 17 August
Light rain. High 107°, low 73°.
0Prairie du Rocher, Tuesday, 18 August
Overcast. High 108°, low 83°.
0Prairie du Rocher, Wednesday, 19 August
Overcast. High 100°, low 78°.
0.02Prairie du Rocher, Thursday, 20 August
Light rain. High 106°, low 79°.
0
Prairie du Rocher, Friday, 21 August
Partly cloudy. High 103°, low 73°.
0Prairie du Rocher, Saturday, 22 August
Clear. High 93°, low 67°.
0Prairie du Rocher, Sunday, 23 August
Partly cloudy. High 100°, low 67°.
0.01Prairie du Rocher, Monday, 24 August
Light rain. High 104°, low 73°.
0.05Prairie du Rocher, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.09Prairie du Rocher, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.09Prairie du Rocher, Thursday, 27 August
Climate normal for this date — 60-year average.
0.1Prairie du Rocher, Friday, 28 August
Climate normal for this date — 60-year average.
0.08Prairie du Rocher, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Prairie du Rocher, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09Prairie du Rocher, Monday, 31 August
Climate normal for this date — 60-year average.
0.11
Prairie du Rocher, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09Prairie du Rocher, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07Prairie du Rocher, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Prairie du Rocher, Friday, 4 September
Climate normal for this date — 60-year average.
0.06Prairie du Rocher, Saturday, 5 September
Climate normal for this date — 60-year average.
0.02Prairie du Rocher, Sunday, 6 September
Climate normal for this date — 60-year average.
0.06Prairie du Rocher, 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 Prairie du Rocher, 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 Prairie du Rocher, 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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