Weather in O'Fallon, IL
O'Fallon, Monday, 12 October, 08:01
Clear. Feels like 66°. High 92°, low 64°.
Monthly outlook for O'Fallon, IL: average high 74.8°, average low 56.7°. That is 5.4° above the climate normal for October. Precipitation is expected on 3 days (about 0.7 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 13 October (92.9°), the coolest 18 October (38.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 October – 21 October | 76.6° | 66.3° | +5.7° |
| 22 October – 31 October | 71.9° | 62.6° | +5.2° |
| 1 November – 10 November | at normal | 58° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Edwardsville (14 mi).
0O'Fallon, Tuesday, 13 October
Clear. High 93°, low 65°.
0.22
O'Fallon, Wednesday, 14 October
Rain. High 82°, low 71°.
0.32O'Fallon, Thursday, 15 October
Rain. High 81°, low 70°.
0.02O'Fallon, Friday, 16 October
Light rain. High 65°, low 53°.
0
O'Fallon, Saturday, 17 October
Overcast. High 63°, low 44°.
0O'Fallon, Sunday, 18 October
Clear. High 66°, low 38°.
0O'Fallon, Monday, 19 October
Overcast. High 75°, low 49°.
0.12O'Fallon, Tuesday, 20 October
Light rain. High 71°, low 58°.
0O'Fallon, Wednesday, 21 October
Clear. High 77°, low 56°.
0
O'Fallon, Thursday, 22 October
Partly cloudy. High 81°, low 57°.
0O'Fallon, Friday, 23 October
Overcast. High 75°, low 64°.
0O'Fallon, Saturday, 24 October
Overcast. High 70°, low 54°.
0.02O'Fallon, Sunday, 25 October
Light rain. High 80°, low 61°.
0O'Fallon, Monday, 26 October
Overcast. High 60°, low 57°.
0O'Fallon, Tuesday, 27 October
Partly cloudy. High 66°, low 45°.
0.05O'Fallon, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.11O'Fallon, Thursday, 29 October
Climate normal for this date — 60-year average.
0.12O'Fallon, Friday, 30 October
Climate normal for this date — 60-year average.
0.15
O'Fallon, Saturday, 31 October
Climate normal for this date — 60-year average.
0.18O'Fallon, Sunday, 1 November
Climate normal for this date — 60-year average.
0.08O'Fallon, Monday, 2 November
Climate normal for this date — 60-year average.
0.11O'Fallon, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.16O'Fallon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.16O'Fallon, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09O'Fallon, Friday, 6 November
Climate normal for this date — 60-year average.
0.08O'Fallon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04
O'Fallon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.1O'Fallon, Monday, 9 November
Climate normal for this date — 60-year average.
0.13O'Fallon, Tuesday, 10 November
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 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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