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As of 17:39 CDT

Weather in O'Fallon, IL

74°Current weather

O'Fallon, Monday, 26 October, 17:39

Clear. Feels like 74°. High 76°, low 51°.

Pressure30.24 inHg
Wind6.9 mph S
Humidity43%
Visibility6.2 mi
Dew point51°

10-day forecast for O'Fallon, IL: 43° to 80°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.

77°
Best day: Friday, October 30
65° · 0.97 in
Worst day: Monday, November 2

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

Tue, 2775° / 51°0Overcast
MorningOvercast54°feels 53°
AfternoonOvercast73°feels 72°
EveningOvercast62°feels 60°
OvernightPartly cloudy55°feels 54°
75 °Overcast

O'Fallon, Tuesday, 27 October

Overcast. High 75°, low 51°.

Pressure30.24 inHg
Wind5.9 mph S
Humidity55%
Visibility6.2 mi
Dew point51°
Wed, 2876° / 52°0Clear
MorningClear55°feels 55°
AfternoonClear76°feels 75°
EveningClear67°feels 66°
OvernightOvercast56°feels 55°
76 °Clear

O'Fallon, Wednesday, 28 October

Clear. High 76°, low 52°.

Pressure30.21 inHg
Wind5.6 mph S
Humidity52%
Visibility6.2 mi
Dew point54°
Thu, 2980° / 58°0.06Light rain
MorningClear59°feels 58°
AfternoonMostly clear78°feels 78°
EveningLight rain68°feels 68°
OvernightClear60°feels 59°
80 °Light rain

O'Fallon, Thursday, 29 October

Light rain. High 80°, low 58°.

Pressure30.15 inHg
Wind6.3 mph SW
Humidity53%
Visibility6.2 mi
Dew point57°
Fri, 3077° / 59°0Overcast
MorningOvercast61°feels 62°
AfternoonOvercast76°feels 76°
EveningOvercast70°feels 70°
OvernightPartly cloudy62°feels 62°
77 °Overcast

O'Fallon, Friday, 30 October

Overcast. High 77°, low 59°.

Pressure30.18 inHg
Wind4.2 mph SE
Humidity72%
Visibility6.2 mi
Dew point62°
Sat, 3170° / 62°0.01Light rain
MorningLight rain64°feels 64°
AfternoonLight rain68°feels 68°
EveningLight rain65°feels 65°
OvernightLight rain63°feels 63°
70 °Light rain

O'Fallon, Saturday, 31 October

Light rain. High 70°, low 62°.

Pressure30.12 inHg
Wind10 mph SE
Humidity68%
Visibility—
Dew point56°
Sun, 0170° / 60°0.37Rain
MorningRain64°feels 64°
AfternoonRain67°feels 67°
EveningRain62°feels 62°
OvernightRain60°feels 60°
70 °Rain

O'Fallon, Sunday, 1 November

Rain. High 70°, low 60°.

Pressure29.94 inHg
Wind11.9 mph SE
Humidity67%
Visibility—
Dew point56°
Mon, 0265° / 56°0.97Heavy rain
MorningHeavy rain59°feels 58°
AfternoonHeavy rain64°feels 64°
EveningHeavy rain59°feels 59°
OvernightHeavy rain60°feels 60°
65 °Heavy rain

O'Fallon, Monday, 2 November

Heavy rain. High 65°, low 56°.

Pressure29.83 inHg
Wind13.2 mph E
Humidity65%
Visibility—
Dew point52°
Tue, 0362° / 46°0.33Rain
MorningRain53°feels 53°
AfternoonRain51°feels 49°
EveningRain48°feels 48°
OvernightRain48°feels 45°
62 °Rain

O'Fallon, Tuesday, 3 November

Rain. High 62°, low 46°.

Pressure29.59 inHg
Wind17.1 mph W
Humidity66%
Visibility—
Dew point40°
Wed, 0456° / 43°0Light rain
MorningLight rain47°feels 43°
AfternoonLight rain54°feels 51°
EveningLight rain46°feels 40°
OvernightLight rain44°feels 38°
56 °Light rain

O'Fallon, Wednesday, 4 November

Light rain. High 56°, low 43°.

Pressure29.85 inHg
Wind13.8 mph NW
Humidity56%
Visibility—
Dew point38°

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.