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As of 17:10 CDT

Weather in O'Fallon, IL

69°Current weather

O'Fallon, Tuesday, 27 October, 17:10

Mostly clear. Feels like 68°. High 71°, low 50°.

Pressure30.18 inHg
Wind6.9 mph S
Humidity56%
Visibility6.2 mi
Dew point53°

10-day forecast for O'Fallon, IL: 47° to 79°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.

78°
Best day: Wednesday, October 28
71° · 1.65 in
Worst day: Tuesday, November 3

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

Wed, 2878° / 50°0Clear
MorningClear53°feels 52°
AfternoonClear77°feels 77°
EveningClear60°feels 59°
OvernightPartly cloudy53°feels 52°
78 °Clear

O'Fallon, Wednesday, 28 October

Clear. High 78°, low 50°.

Pressure30.21 inHg
Wind7.4 mph S
Humidity50%
Visibility6.2 mi
Dew point53°
Thu, 2979° / 53°0.01Light rain
MorningClear58°feels 57°
AfternoonClear77°feels 77°
EveningLight rain67°feels 68°
OvernightClear55°feels 54°
79 °Light rain

O'Fallon, Thursday, 29 October

Light rain. High 79°, low 53°.

Pressure30.15 inHg
Wind5 mph SW
Humidity55%
Visibility6.2 mi
Dew point56°
Fri, 3076° / 60°0Overcast
MorningOvercast61°feels 61°
AfternoonOvercast75°feels 75°
EveningOvercast68°feels 68°
OvernightPartly cloudy61°feels 61°
76 °Overcast

O'Fallon, Friday, 30 October

Overcast. High 76°, low 60°.

Pressure30.24 inHg
Wind5.1 mph SE
Humidity71%
Visibility6.2 mi
Dew point61°
Sat, 3171° / 60°0Overcast
MorningOvercast63°feels 63°
AfternoonOvercast70°feels 70°
EveningOvercast63°feels 63°
OvernightOvercast64°feels 64°
71 °Overcast

O'Fallon, Saturday, 31 October

Overcast. High 71°, low 60°.

Pressure30.21 inHg
Wind2.8 mph E
Humidity70%
Visibility6.2 mi
Dew point59°
Sun, 0163° / 57°0.1Light rain
MorningLight rain59°feels 59°
AfternoonLight rain62°feels 63°
EveningLight rain60°feels 61°
OvernightLight rain59°feels 59°
63 °Light rain

O'Fallon, Sunday, 1 November

Light rain. High 63°, low 57°.

Pressure30.18 inHg
Wind7.6 mph E
Humidity94%
Visibility—
Dew point60°
Mon, 0265° / 58°0.02Light rain
MorningLight rain60°feels 60°
AfternoonLight rain64°feels 64°
EveningLight rain61°feels 61°
OvernightLight rain61°feels 61°
65 °Light rain

O'Fallon, Monday, 2 November

Light rain. High 65°, low 58°.

Pressure29.91 inHg
Wind8 mph E
Humidity68%
Visibility—
Dew point53°
Tue, 0371° / 61°1.65Heavy rain
MorningHeavy rain64°feels 64°
AfternoonHeavy rain70°feels 70°
EveningHeavy rain63°feels 63°
OvernightHeavy rain61°feels 61°
71 °Heavy rain

O'Fallon, Tuesday, 3 November

Heavy rain. High 71°, low 61°.

Pressure29.59 inHg
Wind16.6 mph SE
Humidity71%
Visibility—
Dew point60°
Wed, 0460° / 47°0.81Rain
MorningRain50°feels 47°
AfternoonRain55°feels 53°
EveningRain50°feels 47°
OvernightRain50°feels 49°
60 °Rain

O'Fallon, Wednesday, 4 November

Rain. High 60°, low 47°.

Pressure29.68 inHg
Wind12.8 mph SE
Humidity55%
Visibility—
Dew point39°
Thu, 0558° / 49°0.08Light rain
MorningLight rain52°feels 49°
AfternoonLight rain57°feels 56°
EveningLight rain55°feels 54°
OvernightLight rain55°feels 53°
58 °Light rain

O'Fallon, Thursday, 5 November

Light rain. High 58°, low 49°.

Pressure29.68 inHg
Wind13.5 mph W
Humidity64%
Visibility—
Dew point44°

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.