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As of 09:30 CDT

Weather in O'Fallon, IL

55°Current weather

O'Fallon, Sunday, 25 October, 09:30

Overcast. Feels like 54°. High 75°, low 48°.

Pressure30.42 inHg
Wind2.2 mph SE
Humidity86%
Visibility6.2 mi
Dew point51°

10-day forecast for O'Fallon, IL: 48° to 80°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.

80°
Best day: Thursday, October 29
69° · 0.86 in
Worst day: Sunday, November 1

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

Mon, 2674° / 52°0Overcast
MorningOvercast55°feels 54°
AfternoonOvercast73°feels 72°
EveningClear58°feels 57°
OvernightOvercast55°feels 54°
74 °Overcast

O'Fallon, Monday, 26 October

Overcast. High 74°, low 52°.

Pressure30.33 inHg
Wind3.4 mph SW
Humidity57%
Visibility6.2 mi
Dew point52°
Tue, 2771° / 52°0Overcast
MorningOvercast54°feels 53°
AfternoonOvercast70°feels 69°
EveningOvercast63°feels 62°
OvernightOvercast55°feels 54°
71 °Overcast

O'Fallon, Tuesday, 27 October

Overcast. High 71°, low 52°.

Pressure30.27 inHg
Wind6 mph S
Humidity57%
Visibility6.2 mi
Dew point52°
Wed, 2875° / 56°0Mostly clear
MorningPartly cloudy57°feels 56°
AfternoonPartly cloudy75°feels 75°
EveningClear66°feels 65°
OvernightOvercast59°feels 58°
75 °Mostly clear

O'Fallon, Wednesday, 28 October

Mostly clear. High 75°, low 56°.

Pressure30.21 inHg
Wind7.1 mph S
Humidity51%
Visibility6.2 mi
Dew point53°
Thu, 2980° / 58°0Clear
MorningClear60°feels 59°
AfternoonClear76°feels 76°
EveningClear69°feels 69°
OvernightClear60°feels 59°
80 °Clear

O'Fallon, Thursday, 29 October

Clear. High 80°, low 58°.

Pressure30.15 inHg
Wind8.1 mph S
Humidity49%
Visibility—
Dew point54°
Fri, 3076° / 58°0Overcast
MorningOvercast63°feels 63°
AfternoonOvercast74°feels 74°
EveningOvercast69°feels 69°
OvernightOvercast64°feels 64°
76 °Overcast

O'Fallon, Friday, 30 October

Overcast. High 76°, low 58°.

Pressure30.21 inHg
Wind6.6 mph E
Humidity66%
Visibility—
Dew point60°
Sat, 3166° / 60°0.13Light rain
MorningLight rain64°feels 63°
AfternoonLight rain63°feels 62°
EveningLight rain63°feels 62°
OvernightLight rain61°feels 61°
66 °Light rain

O'Fallon, Saturday, 31 October

Light rain. High 66°, low 60°.

Pressure30.15 inHg
Wind8.3 mph S
Humidity79%
Visibility—
Dew point56°
Sun, 0169° / 59°0.86Rain
MorningRain62°feels 63°
AfternoonRain68°feels 68°
EveningRain65°feels 65°
OvernightRain63°feels 63°
69 °Rain

O'Fallon, Sunday, 1 November

Rain. High 69°, low 59°.

Pressure30.06 inHg
Wind9 mph NW
Humidity70%
Visibility—
Dew point58°
Mon, 0276° / 58°0Overcast
MorningOvercast63°feels 62°
AfternoonOvercast74°feels 74°
EveningOvercast69°feels 69°
OvernightOvercast65°feels 65°
76 °Overcast

O'Fallon, Monday, 2 November

Overcast. High 76°, low 58°.

Pressure30.00 inHg
Wind12.8 mph S
Humidity59%
Visibility—
Dew point57°
Tue, 0377° / 62°0.14Light rain
MorningLight rain67°feels 67°
AfternoonLight rain74°feels 73°
EveningLight rain65°feels 64°
OvernightLight rain62°feels 61°
77 °Light rain

O'Fallon, Tuesday, 3 November

Light rain. High 77°, low 62°.

Pressure29.88 inHg
Wind12.6 mph S
Humidity46%
Visibility—
Dew point52°

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.