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As of 15:20 CST

Weather in O'Fallon, IL

42°Current weather

O'Fallon, Friday, 13 November, 15:20

Overcast. Feels like 36°. High 43°, low 36°.

Pressure30.09 inHg
Wind12.7 mph NW
Humidity59%
Visibility6.2 mi
Dew point30°

10-day forecast for O'Fallon, IL: 31° to 67°, with precipitation expected on 0 days. The table below breaks each day into morning, afternoon, evening and overnight.

67°
Best day: Friday, November 20
42°
Worst day: Sunday, November 22

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

Sat, 1447° / 32°0Clear
MorningClear38°feels 35°
AfternoonClear46°feels 46°
EveningClear42°feels 42°
OvernightClear34°feels 30°
47 °Clear

O'Fallon, Saturday, 14 November

Clear. High 47°, low 32°.

Pressure30.33 inHg
Wind3.7 mph N
Humidity58%
Visibility6.2 mi
Dew point27°
Sun, 1551° / 31°0Partly cloudy
MorningMostly clear35°feels 33°
AfternoonOvercast51°feels 48°
EveningClear40°feels 40°
OvernightClear32°feels 32°
51 °Partly cloudy

O'Fallon, Sunday, 15 November

Partly cloudy. High 51°, low 31°.

Pressure30.45 inHg
Wind1.3 mph NE
Humidity51%
Visibility6.2 mi
Dew point31°
Mon, 1653° / 32°0Clear
MorningClear37°feels 37°
AfternoonClear53°feels 51°
EveningClear42°feels 39°
OvernightClear34°feels 31°
53 °Clear

O'Fallon, Monday, 16 November

Clear. High 53°, low 32°.

Pressure30.53 inHg
Wind1.9 mph S
Humidity49%
Visibility6.2 mi
Dew point33°
Tue, 1754° / 35°0Clear
MorningClear41°feels 38°
AfternoonClear54°feels 51°
EveningClear44°feels 41°
OvernightClear37°feels 34°
54 °Clear

O'Fallon, Tuesday, 17 November

Clear. High 54°, low 35°.

Pressure30.47 inHg
Wind4.9 mph SE
Humidity52%
Visibility6.2 mi
Dew point36°
Wed, 1860° / 37°0Overcast
MorningOvercast43°feels 39°
AfternoonOvercast57°feels 55°
EveningOvercast54°feels 53°
OvernightOvercast50°feels 47°
60 °Overcast

O'Fallon, Wednesday, 18 November

Overcast. High 60°, low 37°.

Pressure30.33 inHg
Wind11.1 mph SE
Humidity53%
Visibility—
Dew point38°
Thu, 1959° / 50°0.04Light rain
MorningLight rain54°feels 52°
AfternoonLight rain57°feels 56°
EveningLight rain56°feels 56°
OvernightLight rain56°feels 55°
59 °Light rain

O'Fallon, Thursday, 19 November

Light rain. High 59°, low 50°.

Pressure30.30 inHg
Wind10.7 mph S
Humidity71%
Visibility—
Dew point47°
Fri, 2067° / 56°0Overcast
MorningOvercast59°feels 58°
AfternoonOvercast66°feels 65°
EveningOvercast61°feels 60°
OvernightOvercast57°feels 56°
67 °Overcast

O'Fallon, Friday, 20 November

Overcast. High 67°, low 56°.

Pressure30.24 inHg
Wind12.4 mph S
Humidity53%
Visibility—
Dew point48°
Sat, 2166° / 44°0.04Light rain
MorningLight rain56°feels 55°
AfternoonLight rain64°feels 63°
EveningLight rain49°feels 46°
OvernightLight rain45°feels 39°
66 °Light rain

O'Fallon, Saturday, 21 November

Light rain. High 66°, low 44°.

Pressure29.94 inHg
Wind17.9 mph NW
Humidity58%
Visibility—
Dew point49°
Sun, 2242° / 32°0Clear
MorningClear35°feels 26°
AfternoonClear40°feels 31°
EveningClear36°feels 28°
OvernightClear32°feels 24°
42 °Clear

O'Fallon, Sunday, 22 November

Clear. High 42°, low 32°.

Pressure30.27 inHg
Wind16.5 mph NW
Humidity25%
Visibility—
Dew point6°

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.