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As of 01:44 CDT

Weather in O'Fallon, IL

51°Current weather

O'Fallon, Tuesday, 20 October, 01:44

Overcast. Feels like 50°. High 73°, low 45°.

Pressure30.33 inHg
Wind4.6 mph N
Humidity89%
Visibility6.2 mi
Dew point48°

10-day forecast for O'Fallon, IL: 29° to 77°, with precipitation expected on 1 day. The table below breaks each day into morning, afternoon, evening and overnight.

77°
Best day: Sunday, October 25
45°
Worst day: Wednesday, October 28

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

Wed, 2171° / 45°0Overcast
MorningPartly cloudy49°feels 49°
AfternoonOvercast68°feels 67°
EveningClear60°feels 59°
OvernightClear49°feels 49°
71 °Overcast

O'Fallon, Wednesday, 21 October

Overcast. High 71°, low 45°.

Pressure30.27 inHg
Wind0.6 mph W
Humidity53%
Visibility6.2 mi
Dew point48°
Thu, 2273° / 49°0Clear
MorningClear51°feels 50°
AfternoonClear72°feels 71°
EveningClear61°feels 60°
OvernightClear53°feels 52°
73 °Clear

O'Fallon, Thursday, 22 October

Clear. High 73°, low 49°.

Pressure30.30 inHg
Wind2.8 mph NE
Humidity46%
Visibility6.2 mi
Dew point48°
Fri, 2371° / 52°0Clear
MorningClear55°feels 54°
AfternoonClear71°feels 69°
EveningClear60°feels 59°
OvernightClear54°feels 53°
71 °Clear

O'Fallon, Friday, 23 October

Clear. High 71°, low 52°.

Pressure30.30 inHg
Wind5.2 mph SE
Humidity53%
Visibility6.2 mi
Dew point49°
Sat, 2471° / 49°0Partly cloudy
MorningPartly cloudy54°feels 53°
AfternoonPartly cloudy68°feels 66°
EveningPartly cloudy62°feels 60°
OvernightPartly cloudy56°feels 55°
71 °Partly cloudy

O'Fallon, Saturday, 24 October

Partly cloudy. High 71°, low 49°.

Pressure30.36 inHg
Wind7.1 mph SE
Humidity43%
Visibility—
Dew point43°
Sun, 2577° / 52°0Overcast
MorningOvercast58°feels 57°
AfternoonOvercast73°feels 72°
EveningOvercast66°feels 65°
OvernightOvercast62°feels 61°
77 °Overcast

O'Fallon, Sunday, 25 October

Overcast. High 77°, low 52°.

Pressure30.39 inHg
Wind6.9 mph S
Humidity39%
Visibility—
Dew point45°
Mon, 2674° / 60°0Overcast
MorningOvercast63°feels 61°
AfternoonOvercast70°feels 68°
EveningOvercast64°feels 62°
OvernightOvercast60°feels 58°
74 °Overcast

O'Fallon, Monday, 26 October

Overcast. High 74°, low 60°.

Pressure30.24 inHg
Wind6.8 mph SW
Humidity39%
Visibility—
Dew point43°
Tue, 2759° / 41°0.1Light rain
MorningLight rain53°feels 51°
AfternoonLight rain46°feels 40°
EveningLight rain44°feels 39°
OvernightLight rain44°feels 38°
59 °Light rain

O'Fallon, Tuesday, 27 October

Light rain. High 59°, low 41°.

Pressure30.30 inHg
Wind16.1 mph N
Humidity84%
Visibility—
Dew point43°
Wed, 2845° / 30°0Clear
MorningClear34°feels 26°
AfternoonClear43°feels 37°
EveningClear36°feels 31°
OvernightClear33°feels 27°
45 °Clear

O'Fallon, Wednesday, 28 October

Clear. High 45°, low 30°.

Pressure30.50 inHg
Wind12.8 mph N
Humidity25%
Visibility—
Dew point9°
Thu, 2953° / 29°0Clear
MorningClear35°feels 31°
AfternoonClear49°feels 47°
EveningClear43°feels 42°
OvernightClear39°feels 36°
53 °Clear

O'Fallon, Thursday, 29 October

Clear. High 53°, low 29°.

Pressure30.33 inHg
Wind6.2 mph W
Humidity23%
Visibility—
Dew point11°

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.