Weather in Oak Forest, IL
Oak Forest, Saturday, 8 August, 15:29
Clear. Feels like 87°. High 84°, low 69°.
Monthly outlook for Oak Forest, IL: average high 78.9°, average low 65°. That is 0.6° below the climate normal for August. Precipitation is expected on 6 days (about 2.5 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 11 August (86.5°), the coolest 23 August (54.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 79.2° | 80.1° | -0.5° |
| 18 August – 27 August | 78.4° | 80° | -0.9° |
| 28 August – 6 September | at normal | 78.6° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Orland Hills (5 mi).
1.63
Oak Forest, Sunday, 9 August
Heavy rain. High 83°, low 65°.
0.07Oak Forest, Monday, 10 August
Rain. High 83°, low 72°.
0.17Oak Forest, Tuesday, 11 August
Light rain. High 87°, low 73°.
0.01Oak Forest, Wednesday, 12 August
Light rain. High 80°, low 69°.
0.03Oak Forest, Thursday, 13 August
Light rain. High 72°, low 63°.
0Oak Forest, Friday, 14 August
Clear. High 75°, low 61°.
0
Oak Forest, Saturday, 15 August
Overcast. High 76°, low 58°.
0Oak Forest, Sunday, 16 August
Clear. High 78°, low 59°.
0.1Oak Forest, Monday, 17 August
Light rain. High 75°, low 68°.
0
Oak Forest, Tuesday, 18 August
Partly cloudy. High 84°, low 68°.
0.38Oak Forest, Wednesday, 19 August
Rain. High 83°, low 65°.
0.05Oak Forest, Thursday, 20 August
Light rain. High 80°, low 67°.
0Oak Forest, Friday, 21 August
Partly cloudy. High 80°, low 65°.
0.02Oak Forest, Saturday, 22 August
Light rain. High 78°, low 62°.
0
Oak Forest, Sunday, 23 August
Mostly clear. High 66°, low 55°.
0.13Oak Forest, Monday, 24 August
Climate normal for this date — 60-year average.
0.09Oak Forest, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15
Oak Forest, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.12Oak Forest, Thursday, 27 August
Climate normal for this date — 60-year average.
0.15Oak Forest, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Oak Forest, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Oak Forest, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Oak Forest, Monday, 31 August
Climate normal for this date — 60-year average.
0.13Oak Forest, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.07Oak Forest, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07Oak Forest, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Oak Forest, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Oak Forest, Saturday, 5 September
Climate normal for this date — 60-year average.
0.11Oak Forest, 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 Oak Forest, 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 Oak Forest, 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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