Weather in Granite City, IL
Granite City, Sunday, 9 August, 04:51
Partly cloudy. Feels like 75°. High 97°, low 73°.
Monthly outlook for Granite City, IL: average high 96.9°, average low 74.6°. That is 6.2° above the climate normal for August. Precipitation is expected on 6 days (about 1.0 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 20 August (114.3°), the coolest 15 August (65.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 91° | 85.8° | +2.9° |
| 19 August – 28 August | 106.8° | 85.9° | +11.6° |
| 29 August – 7 September | at normal | 83.6° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Flordell Hills (7 mi).
0.32
Granite City, Monday, 10 August
Heavy rain. High 100°, low 71°.
0.07Granite City, Tuesday, 11 August
Light rain. High 102°, low 71°.
0.05Granite City, Wednesday, 12 August
Light rain. High 95°, low 78°.
0.24Granite City, Thursday, 13 August
Light rain. High 86°, low 72°.
0.14Granite City, Friday, 14 August
Light rain. High 73°, low 66°.
0.09Granite City, Saturday, 15 August
Light rain. High 88°, low 66°.
0
Granite City, Sunday, 16 August
Partly cloudy. High 90°, low 71°.
0.02Granite City, Monday, 17 August
Light rain. High 87°, low 72°.
0.02Granite City, Tuesday, 18 August
Light rain. High 93°, low 69°.
0Granite City, Wednesday, 19 August
Partly cloudy. High 108°, low 78°.
0
Granite City, Thursday, 20 August
Clear. High 114°, low 83°.
0Granite City, Friday, 21 August
Clear. High 101°, low 84°.
0Granite City, Saturday, 22 August
Clear. High 110°, low 81°.
0.01Granite City, Sunday, 23 August
Light rain. High 109°, low 80°.
0.02Granite City, Monday, 24 August
Light rain. High 99°, low 78°.
0.07Granite City, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.14
Granite City, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13Granite City, Thursday, 27 August
Climate normal for this date — 60-year average.
0.08Granite City, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Granite City, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Granite City, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Granite City, Monday, 31 August
Climate normal for this date — 60-year average.
0.11Granite City, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.12Granite City, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Granite City, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Granite City, Friday, 4 September
Climate normal for this date — 60-year average.
0.04
Granite City, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Granite City, Sunday, 6 September
Climate normal for this date — 60-year average.
0.11Granite City, 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 Granite City, 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 Granite City, 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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