Weather in Chicago Heights, IL
Chicago Heights, Sunday, 9 August, 12:47
Partly cloudy. Feels like 97°. High 87°, low 63°.
Monthly outlook for Chicago Heights, IL: average high 80.6°, average low 64.1°. That is 0.5° above the climate normal for August. Precipitation is expected on 8 days (about 3.2 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 10 August (92.4°), the coolest 18 August (59°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.2° | 79.9° | +0.8° |
| 19 August – 28 August | 79.6° | 79.9° | -0.1° |
| 29 August – 7 September | at normal | 78.2° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Blue Island (10 mi).
0.7
Chicago Heights, Monday, 10 August
Heavy rain. High 92°, low 73°.
1.15Chicago Heights, Tuesday, 11 August
Heavy rain. High 89°, low 66°.
0.1Chicago Heights, Wednesday, 12 August
Rain. High 85°, low 68°.
0.23Chicago Heights, Thursday, 13 August
Rain. High 74°, low 64°.
0.01Chicago Heights, Friday, 14 August
Light rain. High 76°, low 63°.
0.02Chicago Heights, Saturday, 15 August
Light rain. High 75°, low 63°.
0.23Chicago Heights, Sunday, 16 August
Rain. High 80°, low 64°.
0
Chicago Heights, Monday, 17 August
Overcast. High 75°, low 63°.
0Chicago Heights, Tuesday, 18 August
Overcast. High 79°, low 59°.
0.04Chicago Heights, Wednesday, 19 August
Light rain. High 81°, low 66°.
0.14Chicago Heights, Thursday, 20 August
Light rain. High 74°, low 63°.
0.49Chicago Heights, Friday, 21 August
Heavy rain. High 83°, low 61°.
0.03Chicago Heights, Saturday, 22 August
Light rain. High 83°, low 66°.
0
Chicago Heights, Sunday, 23 August
Clear. High 78°, low 62°.
0Chicago Heights, Monday, 24 August
Clear. High 80°, low 61°.
0.07Chicago Heights, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
Chicago Heights, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Chicago Heights, Thursday, 27 August
Climate normal for this date — 60-year average.
0.15Chicago Heights, Friday, 28 August
Climate normal for this date — 60-year average.
0.1Chicago Heights, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Chicago Heights, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Chicago Heights, Monday, 31 August
Climate normal for this date — 60-year average.
0.13Chicago Heights, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Chicago Heights, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07Chicago Heights, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Chicago Heights, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Chicago Heights, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Chicago Heights, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13Chicago Heights, 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 Chicago Heights, 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 Chicago Heights, 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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