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O'Fallon, IL Weather Forecast
O'Fallon, IL Weather Forecast Dated: 1010 PM Thu Oct 29 2026
Expect a cool pattern with more clouds than sun and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate.
Thursday, October 29, 2026
Mid-Morning
64°F 18°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
71°F 22°C
Sunny
Warm and summery near 81°F 27°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds turning from the SSW to the N at 3 mph 4 km/h.
Friday, October 30, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
79°F 26°C
Overcast
Early-Evening
70°F 21°C
Overcast
Comfortable with temperatures reaching 79°F 26°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure. Winds switching from the E to the ESE at 7 mph 11 km/h.
Saturday, October 31, 2026
Mid-Morning
63°F 17°C
Overcast
Mid-Afternoon
74°F 23°C
Overcast
Early-Evening
67°F 20°C
Overcast
Enjoyable around 74°F 23°C, overcast throughout the day, with steady humidity and steady pressure. Winds moving from the E to the SSE at 9 mph 13 km/h.
Sunday, November 1, 2026
Mid-Morning
63°F 17°C
Scattered Showers
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
62°F 17°C
Overcast
Cool with a high near 66°F 19°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.
Monday, November 2, 2026
Mid-Morning
63°F 17°C
Scattered Showers
Mid-Afternoon
67°F 19°C
Overcast
Early-Evening
67°F 19°C
Overcast
Refreshing around 67°F 19°C, scattered downpours possible, with steady humidity and barometric pressure falling. Winds out of the SSE at 11 mph 18 km/h. Gusts up to 27 mph 43 km/h.
Tuesday, November 3, 2026
Mid-Morning
67°F 20°C
Scattered Showers
Mid-Afternoon
73°F 23°C
Light Showers
Early-Evening
68°F 20°C
Light Showers
Pleasant near 73°F 23°C, locally heavy downpours at times, with steady humidity and barometric pressure falling. Winds blowing from the S at 16 mph 26 km/h. Gusts up to 28 mph 45 km/h.
Wednesday, November 4, 2026
Mid-Morning
62°F 16°C
Drizzle
Mid-Afternoon
60°F 16°C
Scattered Showers
Early-Evening
58°F 15°C
Partly Cloudy
Comfortable at 60°F 16°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.
Thursday, November 5, 2026
Mid-Morning
57°F 14°C
Cloudy
Mid-Afternoon
60°F 16°C
Scattered Showers
Early-Evening
56°F 14°C
Partly Cloudy
Cool with a high near 60°F 16°C, scattered downpours possible, with steady humidity and steady pressure. Winds turning from the NNW to the NW at 6 mph 10 km/h.
Friday, November 6, 2026
Mid-Morning
55°F 13°C
Sunny
Mid-Afternoon
61°F 16°C
Cloudy
Early-Evening
55°F 13°C
Cloudy
Refreshing around 61°F 16°C, partly cloudy in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure.
Saturday, November 7, 2026
Mid-Morning
51°F 11°C
Sunny
Mid-Afternoon
57°F 14°C
Partly Cloudy
Early-Evening
50°F 10°C
Partly Cloudy
Cool and brisk at 57°F 14°C, partly cloudy throughout the day, with steady humidity and steady pressure.
Sunday, November 8, 2026
Mid-Morning
49°F 10°C
Partly Cloudy
Mid-Afternoon
53°F 12°C
Cloudy
Early-Evening
49°F 10°C
Scattered Showers
Chilly near 53°F 12°C, scattered downpours possible, with steady humidity and barometric pressure falling. Winds out of the E at 8 mph 13 km/h.
Monday, November 9, 2026
Mid-Morning
49°F 10°C
Overcast
Mid-Afternoon
52°F 11°C
Overcast
Early-Evening
50°F 10°C
Overcast
Crisp with a high near 52°F 11°C, overcast throughout the day, with steady humidity and steady pressure.
Tuesday, November 10, 2026
Mid-Morning
49°F 10°C
Scattered Showers
Mid-Afternoon
50°F 10°C
Scattered Showers
Early-Evening
49°F 9°C
Scattered Showers
Brisk around 50°F 10°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds moving from the N to the NNW at 8 mph 13 km/h.
Wednesday, November 11, 2026
Mid-Morning
48°F 9°C
Partly Cloudy
Mid-Afternoon
53°F 12°C
Partly Cloudy
Early-Evening
48°F 9°C
Partly Cloudy
Cool and brisk at 53°F 12°C, partly cloudy throughout the day, with steady humidity and steady pressure.
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