Weather in O'Fallon, MO
O'Fallon, Tuesday, 13 October, 02:45
Clear. Feels like 71°. High 93°, low 67°.
Monthly outlook for O'Fallon, MO: average high 71°, average low 53.5°. That is 3.5° above the climate normal for October. Precipitation is expected on 3 days (about 1.2 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 13 October (93.4°), the coolest 27 October (42.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 October – 22 October | 75.2° | 66.1° | +5° |
| 23 October – 1 November | 64.1° | 62.2° | +1.1° |
| 2 November – 11 November | at normal | 57.4° | — |
October records over 66 years
0.22
O'Fallon, Wednesday, 14 October
Rain. High 84°, low 65°.
0.59O'Fallon, Thursday, 15 October
Heavy rain. High 81°, low 69°.
0.04O'Fallon, Friday, 16 October
Light rain. High 64°, low 50°.
0
O'Fallon, Saturday, 17 October
Clear. High 60°, low 43°.
0
O'Fallon, Sunday, 18 October
Overcast. High 69°, low 45°.
0.01O'Fallon, Monday, 19 October
Light rain. High 69°, low 52°.
0.02O'Fallon, Tuesday, 20 October
Light rain. High 77°, low 58°.
0O'Fallon, Wednesday, 21 October
Overcast. High 75°, low 61°.
0O'Fallon, Thursday, 22 October
Overcast. High 80°, low 64°.
0.3O'Fallon, Friday, 23 October
Rain. High 70°, low 54°.
0O'Fallon, Saturday, 24 October
Overcast. High 65°, low 49°.
0
O'Fallon, Sunday, 25 October
Mostly clear. High 61°, low 45°.
0.01O'Fallon, Monday, 26 October
Light rain. High 59°, low 45°.
0O'Fallon, Tuesday, 27 October
Clear. High 69°, low 43°.
0O'Fallon, Wednesday, 28 October
Clear. High 61°, low 47°.
0.13
O'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.
0.16
O'Fallon, Saturday, 31 October
Climate normal for this date — 60-year average.
0.19O'Fallon, Sunday, 1 November
Climate normal for this date — 60-year average.
0.09O'Fallon, Monday, 2 November
Climate normal for this date — 60-year average.
0.12O'Fallon, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.15O'Fallon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.17O'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.
0.07O'Fallon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.03O'Fallon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11O'Fallon, Monday, 9 November
Climate normal for this date — 60-year average.
0.12O'Fallon, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.09O'Fallon, Wednesday, 11 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, MO 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, MO 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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