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As of 09:31 CDT

Weather in O'Fallon, IL

56°Current weather

O'Fallon, Thursday, 22 October, 09:31

Clear. Feels like 56°. High 76°, low 47°.

Pressure30.27 inHg
Wind3.4 mph NE
Humidity91%
Visibility6.2 mi
Dew point54°

10-day forecast for O'Fallon, IL: 41° to 76°, with precipitation expected on 2 days. The table below breaks each day into morning, afternoon, evening and overnight.

76°
Best day: Thursday, October 22
55° · 0.4 in
Worst day: Saturday, October 31

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

Fri, 2375° / 48°0Clear
MorningClear51°feels 50°
AfternoonClear74°feels 73°
EveningClear56°feels 54°
OvernightClear52°feels 50°
75 °Clear

O'Fallon, Friday, 23 October

Clear. High 75°, low 48°.

Pressure30.30 inHg
Wind4.4 mph SE
Humidity48%
Visibility6.2 mi
Dew point49°
Sat, 2472° / 48°0Overcast
MorningOvercast51°feels 50°
AfternoonOvercast71°feels 70°
EveningOvercast60°feels 59°
OvernightClear53°feels 52°
72 °Overcast

O'Fallon, Saturday, 24 October

Overcast. High 72°, low 48°.

Pressure30.36 inHg
Wind4.1 mph SE
Humidity51%
Visibility6.2 mi
Dew point49°
Sun, 2575° / 51°0Clear
MorningMostly clear52°feels 51°
AfternoonMostly clear74°feels 73°
EveningPartly cloudy62°feels 62°
OvernightPartly cloudy54°feels 52°
75 °Clear

O'Fallon, Sunday, 25 October

Clear. High 75°, low 51°.

Pressure30.42 inHg
Wind2.9 mph S
Humidity52%
Visibility6.2 mi
Dew point52°
Mon, 2673° / 54°0Overcast
MorningOvercast57°feels 56°
AfternoonOvercast71°feels 69°
EveningOvercast64°feels 62°
OvernightOvercast57°feels 56°
73 °Overcast

O'Fallon, Monday, 26 October

Overcast. High 73°, low 54°.

Pressure30.33 inHg
Wind4.5 mph S
Humidity45%
Visibility—
Dew point47°
Tue, 2771° / 52°0Overcast
MorningOvercast57°feels 56°
AfternoonOvercast69°feels 69°
EveningOvercast62°feels 60°
OvernightOvercast58°feels 57°
71 °Overcast

O'Fallon, Tuesday, 27 October

Overcast. High 71°, low 52°.

Pressure30.27 inHg
Wind4.6 mph S
Humidity46%
Visibility—
Dew point47°
Wed, 2871° / 54°0Clear
MorningClear58°feels 57°
AfternoonClear68°feels 67°
EveningClear62°feels 60°
OvernightClear59°feels 57°
71 °Clear

O'Fallon, Wednesday, 28 October

Clear. High 71°, low 54°.

Pressure30.15 inHg
Wind10.4 mph W
Humidity42%
Visibility—
Dew point43°
Thu, 2964° / 47°0.13Light rain
MorningLight rain58°feels 58°
AfternoonLight rain54°feels 53°
EveningLight rain50°feels 48°
OvernightLight rain50°feels 47°
64 °Light rain

O'Fallon, Thursday, 29 October

Light rain. High 64°, low 47°.

Pressure30.18 inHg
Wind16.6 mph NW
Humidity88%
Visibility—
Dew point52°
Fri, 3060° / 41°0Overcast
MorningOvercast46°feels 43°
AfternoonOvercast59°feels 56°
EveningOvercast55°feels 51°
OvernightOvercast51°feels 47°
60 °Overcast

O'Fallon, Friday, 30 October

Overcast. High 60°, low 41°.

Pressure30.24 inHg
Wind6.7 mph E
Humidity31%
Visibility—
Dew point26°
Sat, 3155° / 47°0.4Rain
MorningRain49°feels 46°
AfternoonRain54°feels 54°
EveningRain55°feels 54°
OvernightRain53°feels 53°
55 °Rain

O'Fallon, Saturday, 31 October

Rain. High 55°, low 47°.

Pressure30.06 inHg
Wind10.4 mph SE
Humidity92%
Visibility—
Dew point51°

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.