Weather in Glen Carbon, IL
Glen Carbon, Sunday, 9 August, 11:06
Partly cloudy. Feels like 98°. High 96°, low 72°.
Monthly outlook for Glen Carbon, IL: average high 90.3°, average low 68.8°. That is 2.8° above the climate normal for August. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 10 August (102.3°), the coolest 24 August (58.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 92.3° | 85.4° | +3.9° |
| 19 August – 28 August | 86.9° | 85.6° | +0.8° |
| 29 August – 7 September | at normal | 83.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Edwardsville (2 mi).
0
Glen Carbon, Monday, 10 August
Clear. High 102°, low 75°.
0.01
Glen Carbon, Tuesday, 11 August
Light rain. High 99°, low 75°.
0.04Glen Carbon, Wednesday, 12 August
Light rain. High 91°, low 75°.
0.22Glen Carbon, Thursday, 13 August
Rain. High 90°, low 71°.
0
Glen Carbon, Friday, 14 August
Overcast. High 86°, low 70°.
0Glen Carbon, Saturday, 15 August
Overcast. High 91°, low 70°.
0Glen Carbon, Sunday, 16 August
Clear. High 90°, low 75°.
0Glen Carbon, Monday, 17 August
Overcast. High 80°, low 64°.
0.13Glen Carbon, Tuesday, 18 August
Light rain. High 98°, low 65°.
0
Glen Carbon, Wednesday, 19 August
Mostly clear. High 90°, low 69°.
0Glen Carbon, Thursday, 20 August
Clear. High 81°, low 62°.
0Glen Carbon, Friday, 21 August
Clear. High 95°, low 64°.
0Glen Carbon, Saturday, 22 August
Clear. High 91°, low 73°.
0Glen Carbon, Sunday, 23 August
Clear. High 81°, low 61°.
0Glen Carbon, Monday, 24 August
Clear. High 82°, low 59°.
0.06Glen Carbon, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.11Glen Carbon, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Glen Carbon, Thursday, 27 August
Climate normal for this date — 60-year average.
0.09Glen Carbon, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Glen Carbon, Saturday, 29 August
Climate normal for this date — 60-year average.
0.12Glen Carbon, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Glen Carbon, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Glen Carbon, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.1
Glen Carbon, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Glen Carbon, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Glen Carbon, Friday, 4 September
Climate normal for this date — 60-year average.
0.04Glen Carbon, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Glen Carbon, Sunday, 6 September
Climate normal for this date — 60-year average.
0.08Glen Carbon, 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 Glen Carbon, 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 Glen Carbon, 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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