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As of 23:18 CDT

Weather in O'Fallon, IL

66°Current weather

O'Fallon, Thursday, 29 October, 23:18

Overcast. Feels like 66°. High 80°, low 56°.

Pressure30.18 inHg
Wind0 mph N
Humidity91%
Visibility6.2 mi
Dew point63°

10-day forecast for O'Fallon, IL: 47° to 80°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.

80°
Best day: Thursday, October 29
65° · 0.71 in
Worst day: Wednesday, November 4

Tap any day below to see morning, afternoon, evening and overnight.

Fri, 3078° / 59°0Overcast
MorningOvercast59°feels 60°
AfternoonOvercast76°feels 76°
EveningOvercast68°feels 67°
OvernightOvercast65°feels 65°
78 °Overcast

O'Fallon, Friday, 30 October

Overcast. High 78°, low 59°.

Pressure30.24 inHg
Wind6.5 mph E
Humidity67%
Visibility6.2 mi
Dew point60°
Sat, 3172° / 61°0Overcast
MorningOvercast62°feels 62°
AfternoonOvercast68°feels 67°
EveningOvercast63°feels 62°
OvernightOvercast65°feels 66°
72 °Overcast

O'Fallon, Saturday, 31 October

Overcast. High 72°, low 61°.

Pressure30.27 inHg
Wind3.3 mph E
Humidity60%
Visibility6.2 mi
Dew point54°
Sun, 0169° / 60°0.41Rain
MorningLight rain60°feels 60°
AfternoonOvercast68°feels 67°
EveningOvercast63°feels 63°
OvernightRain60°feels 60°
69 °Rain

O'Fallon, Sunday, 1 November

Rain. High 69°, low 60°.

Pressure30.27 inHg
Wind8.5 mph SE
Humidity67%
Visibility6.2 mi
Dew point57°
Mon, 0267° / 59°0Overcast
MorningOvercast60°feels 60°
AfternoonOvercast67°feels 67°
EveningOvercast66°feels 66°
OvernightOvercast59°feels 59°
67 °Overcast

O'Fallon, Monday, 2 November

Overcast. High 67°, low 59°.

Pressure30.09 inHg
Wind10.4 mph S
Humidity81%
Visibility6.2 mi
Dew point59°
Tue, 0375° / 64°0.33Rain
MorningRain67°feels 67°
AfternoonRain72°feels 73°
EveningRain67°feels 68°
OvernightRain66°feels 67°
75 °Rain

O'Fallon, Tuesday, 3 November

Rain. High 75°, low 64°.

Pressure29.91 inHg
Wind15.9 mph S
Humidity66%
Visibility—
Dew point60°
Wed, 0465° / 60°0.71Rain
MorningRain63°feels 63°
AfternoonRain60°feels 60°
EveningRain61°feels 61°
OvernightRain61°feels 62°
65 °Rain

O'Fallon, Wednesday, 4 November

Rain. High 65°, low 60°.

Pressure29.77 inHg
Wind13.8 mph SE
Humidity80%
Visibility—
Dew point54°
Thu, 0567° / 57°0.06Light rain
MorningLight rain62°feels 62°
AfternoonLight rain66°feels 65°
EveningLight rain58°feels 57°
OvernightLight rain57°feels 56°
67 °Light rain

O'Fallon, Thursday, 5 November

Light rain. High 67°, low 57°.

Pressure29.68 inHg
Wind12.7 mph NW
Humidity73%
Visibility—
Dew point57°
Fri, 0664° / 49°0Partly cloudy
MorningPartly cloudy53°feels 50°
AfternoonPartly cloudy62°feels 60°
EveningPartly cloudy56°feels 54°
OvernightPartly cloudy52°feels 50°
64 °Partly cloudy

O'Fallon, Friday, 6 November

Partly cloudy. High 64°, low 49°.

Pressure29.85 inHg
Wind9.4 mph NW
Humidity51%
Visibility—
Dew point43°
Sat, 0764° / 47°0Partly cloudy
MorningPartly cloudy52°feels 49°
AfternoonPartly cloudy61°feels 59°
EveningPartly cloudy54°feels 53°
OvernightPartly cloudy51°feels 49°
64 °Partly cloudy

O'Fallon, Saturday, 7 November

Partly cloudy. High 64°, low 47°.

Pressure30.09 inHg
Wind7.8 mph E
Humidity48%
Visibility—
Dew point40°

About this forecast

How reliable is a 10-day forecast?

The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.

What does the time-of-day table show?

Temperature in O'Fallon, IL around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.

How is the best day chosen?

We weigh the daytime high against precipitation: a warm, dry day scores highest.