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As of 00:04 CDT

Weather in O'Fallon, IL

48°Current weather

O'Fallon, Thursday, 22 October, 00:04

Clear. Feels like 48°. High 77°, low 47°.

Pressure30.21 inHg
Wind2.7 mph SE
Humidity87%
Visibility6.2 mi
Dew point48°

10-day forecast for O'Fallon, IL: 40° to 77°, with precipitation expected on 2 days. The table below breaks each day into morning, afternoon, evening and overnight.

77°
Best day: Thursday, October 22
58° · 0.09 in
Worst day: Wednesday, October 28

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

Fri, 2374° / 47°0Clear
MorningClear51°feels 50°
AfternoonClear72°feels 71°
EveningClear61°feels 60°
OvernightClear51°feels 50°
74 °Clear

O'Fallon, Friday, 23 October

Clear. High 74°, low 47°.

Pressure30.30 inHg
Wind5 mph SE
Humidity47%
Visibility6.2 mi
Dew point48°
Sat, 2473° / 50°0Mostly clear
MorningClear51°feels 50°
AfternoonOvercast73°feels 71°
EveningOvercast62°feels 61°
OvernightClear53°feels 52°
73 °Mostly clear

O'Fallon, Saturday, 24 October

Mostly clear. High 73°, low 50°.

Pressure30.36 inHg
Wind4.3 mph SE
Humidity49%
Visibility6.2 mi
Dew point49°
Sun, 2575° / 51°0Overcast
MorningPartly cloudy55°feels 54°
AfternoonOvercast74°feels 73°
EveningOvercast64°feels 63°
OvernightClear54°feels 53°
75 °Overcast

O'Fallon, Sunday, 25 October

Overcast. High 75°, low 51°.

Pressure30.39 inHg
Wind2.1 mph S
Humidity51%
Visibility6.2 mi
Dew point51°
Mon, 2673° / 54°0Overcast
MorningOvercast59°feels 58°
AfternoonOvercast71°feels 70°
EveningOvercast63°feels 62°
OvernightOvercast58°feels 57°
73 °Overcast

O'Fallon, Monday, 26 October

Overcast. High 73°, low 54°.

Pressure30.33 inHg
Wind4.6 mph SE
Humidity41%
Visibility—
Dew point45°
Tue, 2772° / 53°0Overcast
MorningOvercast59°feels 58°
AfternoonOvercast71°feels 69°
EveningOvercast64°feels 62°
OvernightOvercast58°feels 57°
72 °Overcast

O'Fallon, Tuesday, 27 October

Overcast. High 72°, low 53°.

Pressure30.21 inHg
Wind9.6 mph NW
Humidity38%
Visibility—
Dew point43°
Wed, 2858° / 43°0.09Light rain
MorningLight rain50°feels 47°
AfternoonLight rain52°feels 49°
EveningLight rain46°feels 41°
OvernightLight rain44°feels 39°
58 °Light rain

O'Fallon, Wednesday, 28 October

Light rain. High 58°, low 43°.

Pressure30.30 inHg
Wind15.1 mph NW
Humidity59%
Visibility—
Dew point39°
Thu, 2958° / 41°0.04Light rain
MorningLight rain45°feels 40°
AfternoonLight rain54°feels 51°
EveningLight rain48°feels 48°
OvernightLight rain45°feels 44°
58 °Light rain

O'Fallon, Thursday, 29 October

Light rain. High 58°, low 41°.

Pressure30.33 inHg
Wind12.3 mph NW
Humidity39%
Visibility—
Dew point28°
Fri, 3065° / 40°0Partly cloudy
MorningPartly cloudy46°feels 44°
AfternoonPartly cloudy61°feels 58°
EveningPartly cloudy54°feels 51°
OvernightPartly cloudy49°feels 47°
65 °Partly cloudy

O'Fallon, Friday, 30 October

Partly cloudy. High 65°, low 40°.

Pressure30.18 inHg
Wind11.6 mph S
Humidity32%
Visibility—
Dew point29°
Sat, 3170° / 48°0Overcast
MorningOvercast54°feels 51°
AfternoonOvercast67°feels 65°
EveningOvercast63°feels 61°
OvernightOvercast61°feels 59°
70 °Overcast

O'Fallon, Saturday, 31 October

Overcast. High 70°, low 48°.

Pressure30.06 inHg
Wind18.5 mph S
Humidity40%
Visibility—
Dew point40°

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.