Weather in South Chicago Heights, IL
South Chicago Heights, Sunday, 9 August, 15:51
Heavy rain. Feels like 95°. High 85°, low 63°.
Monthly outlook for South Chicago Heights, IL: average high 83.6°, average low 67.5°. That is 2.1° above the climate normal for August. Precipitation is expected on 8 days (about 3.1 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 10 August (90.7°), the coolest 23 August (61.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 84.2° | 79.9° | +2.4° |
| 19 August – 28 August | 82.7° | 79.9° | +1.5° |
| 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 (12 mi).
0.81South Chicago Heights, Monday, 10 August
Heavy rain. High 91°, low 73°.
0.65South Chicago Heights, Tuesday, 11 August
Heavy rain. High 85°, low 69°.
0
South Chicago Heights, Wednesday, 12 August
Overcast. High 84°, low 67°.
0.15South Chicago Heights, Thursday, 13 August
Light rain. High 81°, low 64°.
0.19South Chicago Heights, Friday, 14 August
Light rain. High 78°, low 68°.
0.16South Chicago Heights, Saturday, 15 August
Light rain. High 89°, low 71°.
0.01South Chicago Heights, Sunday, 16 August
Light rain. High 82°, low 69°.
0South Chicago Heights, Monday, 17 August
Overcast. High 80°, low 64°.
0South Chicago Heights, Tuesday, 18 August
Light rain. High 87°, low 74°.
0South Chicago Heights, Wednesday, 19 August
Overcast. High 86°, low 70°.
0.62South Chicago Heights, Thursday, 20 August
Rain. High 85°, low 70°.
0.26South Chicago Heights, Friday, 21 August
Rain. High 78°, low 68°.
0
South Chicago Heights, Saturday, 22 August
Clear. High 78°, low 64°.
0South Chicago Heights, Sunday, 23 August
Overcast. High 82°, low 61°.
0.04South Chicago Heights, Monday, 24 August
Light rain. High 87°, low 67°.
0.07
South Chicago Heights, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
South Chicago Heights, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14South Chicago Heights, Thursday, 27 August
Climate normal for this date — 60-year average.
0.15South Chicago Heights, Friday, 28 August
Climate normal for this date — 60-year average.
0.1South Chicago Heights, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09South Chicago Heights, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06South Chicago Heights, Monday, 31 August
Climate normal for this date — 60-year average.
0.13South Chicago Heights, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06South Chicago Heights, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07South Chicago Heights, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09South Chicago Heights, Friday, 4 September
Climate normal for this date — 60-year average.
0.07South Chicago Heights, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1South Chicago Heights, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13South Chicago 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 South 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 South 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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