Weather in Forest Park, IL
Forest Park, Saturday, 8 August, 20:22
Clear. Feels like 77°. High 83°, low 69°.
Monthly outlook for Forest Park, IL: average high 81.3°, average low 66.4°. That is 0.7° above the climate normal for August. Precipitation is expected on 3 days (about 1.4 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 10 August (88°), the coolest 21 August (58.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 82.9° | 80.3° | +1.4° |
| 18 August – 27 August | 78.7° | 80.1° | -0.8° |
| 28 August – 6 September | at normal | 78.5° | — |
August records over 66 years
0.51
Forest Park, Sunday, 9 August
Rain. High 87°, low 65°.
0.66Forest Park, Monday, 10 August
Heavy rain. High 88°, low 72°.
0.2Forest Park, Tuesday, 11 August
Heavy rain. High 88°, low 72°.
0
Forest Park, Wednesday, 12 August
Overcast. High 84°, low 70°.
0Forest Park, Thursday, 13 August
Overcast. High 75°, low 66°.
0
Forest Park, Friday, 14 August
Clear. High 82°, low 64°.
0Forest Park, Saturday, 15 August
Overcast. High 76°, low 67°.
0Forest Park, Sunday, 16 August
Overcast. High 80°, low 67°.
0Forest Park, Monday, 17 August
Overcast. High 86°, low 68°.
0Forest Park, Tuesday, 18 August
Overcast. High 87°, low 70°.
0.03Forest Park, Wednesday, 19 August
Light rain. High 79°, low 67°.
0Forest Park, Thursday, 20 August
Overcast. High 69°, low 60°.
0Forest Park, Friday, 21 August
Clear. High 78°, low 59°.
0.01Forest Park, Saturday, 22 August
Light rain. High 72°, low 61°.
0Forest Park, Sunday, 23 August
Clear. High 86°, low 65°.
0.13
Forest Park, Monday, 24 August
Climate normal for this date — 60-year average.
0.08Forest Park, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.16
Forest Park, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Forest Park, Thursday, 27 August
Climate normal for this date — 60-year average.
0.14Forest Park, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Forest Park, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Forest Park, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Forest Park, Monday, 31 August
Climate normal for this date — 60-year average.
0.13Forest Park, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Forest Park, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Forest Park, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Forest Park, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Forest Park, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Forest Park, 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 Forest Park, 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 Forest Park, 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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