Weather in South Holland, IL
South Holland, Sunday, 9 August, 11:12
Overcast. Feels like 90°. High 88°, low 63°.
Monthly outlook for South Holland, IL: average high 81.2°, average low 65°. That is 0.7° above the climate normal for August. Precipitation is expected on 8 days (about 3.3 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 10 August (92.3°), the coolest 18 August (60.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.6° | 80° | +0.9° |
| 19 August – 28 August | 80.6° | 80.1° | +0.3° |
| 29 August – 7 September | at normal | 78.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Calumet Park (5 mi).
0.9
South Holland, Monday, 10 August
Heavy rain. High 92°, low 73°.
1.31South Holland, Tuesday, 11 August
Heavy rain. High 89°, low 67°.
0.1South Holland, Wednesday, 12 August
Rain. High 85°, low 69°.
0.17South Holland, Thursday, 13 August
Light rain. High 75°, low 65°.
0South Holland, Friday, 14 August
Overcast. High 76°, low 64°.
0.03South Holland, Saturday, 15 August
Light rain. High 75°, low 64°.
0.24South Holland, Sunday, 16 August
Rain. High 81°, low 64°.
0South Holland, Monday, 17 August
Overcast. High 75°, low 65°.
0South Holland, Tuesday, 18 August
Overcast. High 80°, low 60°.
0.03South Holland, Wednesday, 19 August
Light rain. High 82°, low 67°.
0.09South Holland, Thursday, 20 August
Light rain. High 75°, low 65°.
0.34South Holland, Friday, 21 August
Rain. High 83°, low 62°.
0.01South Holland, Saturday, 22 August
Light rain. High 85°, low 66°.
0
South Holland, Sunday, 23 August
Clear. High 78°, low 63°.
0South Holland, Monday, 24 August
Clear. High 81°, low 63°.
0.07
South Holland, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
South Holland, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14South Holland, Thursday, 27 August
Climate normal for this date — 60-year average.
0.15South Holland, Friday, 28 August
Climate normal for this date — 60-year average.
0.1South Holland, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09South Holland, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06South Holland, Monday, 31 August
Climate normal for this date — 60-year average.
0.13South Holland, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06South Holland, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07South Holland, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09South Holland, Friday, 4 September
Climate normal for this date — 60-year average.
0.07South Holland, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1South Holland, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13South Holland, 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 Holland, 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 Holland, 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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