Weather in O'Fallon, IL
O'Fallon, Saturday, 8 August, 13:09
Clear. Feels like 98°. High 88°, low 70°.
0
O'Fallon, Sunday, 9 August
Partly cloudy. High 92°, low 70°.
0O'Fallon, Monday, 10 August
Partly cloudy. High 97°, low 72°.
0.02
O'Fallon, Tuesday, 11 August
Light rain. High 100°, low 75°.
0O'Fallon, Wednesday, 12 August
Light rain. High 88°, low 74°.
0.26O'Fallon, Thursday, 13 August
Light rain. High 80°, low 68°.
0
O'Fallon, Friday, 14 August
Overcast. High 76°, low 60°.
0.09O'Fallon, Saturday, 15 August
Light rain. High 79°, low 59°.
0.9O'Fallon, Sunday, 16 August
Rain. High 80°, low 66°.
0O'Fallon, Monday, 17 August
Overcast. High 83°, low 73°.
0.04O'Fallon, Tuesday, 18 August
Light rain. High 87°, low 70°.
0.1O'Fallon, Wednesday, 19 August
Light rain. High 89°, low 70°.
0
O'Fallon, Thursday, 20 August
Mostly clear. High 71°, low 57°.
0O'Fallon, Friday, 21 August
Clear. High 72°, low 50°.
0O'Fallon, Saturday, 22 August
Mostly clear. High 74°, low 52°.
0O'Fallon, Sunday, 23 August
Clear. High 79°, low 54°.
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 O'Fallon, 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 O'Fallon, 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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