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As of 23:25 CDT

Weather in O'Fallon, IL

75°Current weather

O'Fallon, Saturday, 8 August, 23:25

Clear. Feels like 77°. High 90°, low 70°.

Pressure30.03 inHg
Wind6.3 mph S
Humidity89%
Visibility6.2 mi
Dew point72°

10-day forecast for O'Fallon, IL: 66° to 100°, with precipitation expected on 7 days. The table below breaks each day into morning, afternoon, evening and overnight.

98°
Best day: Monday, August 10
80° · 0.85 in
Worst day: Thursday, August 13

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

Sun, 0995° / 72°0Partly cloudy
MorningPartly cloudy77°feels 79°
AfternoonMostly clear93°feels 101°
EveningClear86°feels 94°
OvernightClear76°feels 77°
95 °Partly cloudy

O'Fallon, Sunday, 9 August

Partly cloudy. High 95°, low 72°.

Pressure29.97 inHg
Wind11.1 mph S
Humidity60%
Visibility6.2 mi
Dew point73°
Mon, 1098° / 74°0Mostly clear
MorningClear78°feels 79°
AfternoonClear97°feels 104°
EveningOvercast85°feels 88°
OvernightMostly clear83°feels 88°
98 °Mostly clear

O'Fallon, Monday, 10 August

Mostly clear. High 98°, low 74°.

Pressure29.94 inHg
Wind12.3 mph SW
Humidity50%
Visibility6.2 mi
Dew point72°
Tue, 11100° / 73°0.08Light rain
MorningLight rain75°feels 77°
AfternoonClear99°feels 104°
EveningOvercast88°feels 90°
OvernightOvercast83°feels 85°
100 °Light rain

O'Fallon, Tuesday, 11 August

Light rain. High 100°, low 73°.

Pressure29.88 inHg
Wind10.1 mph SW
Humidity46%
Visibility6.2 mi
Dew point70°
Wed, 1290° / 71°0.13Light rain
MorningOvercast76°feels 77°
AfternoonOvercast87°feels 93°
EveningLight rain78°feels 79°
OvernightOvercast82°feels 84°
90 °Light rain

O'Fallon, Wednesday, 12 August

Light rain. High 90°, low 71°.

Pressure29.85 inHg
Wind2.5 mph W
Humidity64%
Visibility6.2 mi
Dew point71°
Thu, 1380° / 70°0.85Rain
MorningRain73°feels 74°
AfternoonRain79°feels 79°
EveningRain73°feels 75°
OvernightRain71°feels 72°
80 °Rain

O'Fallon, Thursday, 13 August

Rain. High 80°, low 70°.

Pressure29.91 inHg
Wind11.4 mph NE
Humidity79%
Visibility—
Dew point71°
Fri, 1475° / 69°0.44Rain
MorningRain71°feels 72°
AfternoonRain75°feels 76°
EveningRain73°feels 74°
OvernightRain70°feels 71°
75 °Rain

O'Fallon, Friday, 14 August

Rain. High 75°, low 69°.

Pressure30.03 inHg
Wind12.3 mph SE
Humidity86%
Visibility—
Dew point69°
Sat, 1579° / 67°0.17Light rain
MorningLight rain70°feels 71°
AfternoonLight rain77°feels 78°
EveningLight rain73°feels 74°
OvernightLight rain70°feels 71°
79 °Light rain

O'Fallon, Saturday, 15 August

Light rain. High 79°, low 67°.

Pressure30.18 inHg
Wind13.8 mph E
Humidity73%
Visibility—
Dew point67°
Sun, 1681° / 66°0.05Light rain
MorningLight rain70°feels 70°
AfternoonLight rain79°feels 80°
EveningLight rain75°feels 77°
OvernightLight rain70°feels 72°
81 °Light rain

O'Fallon, Sunday, 16 August

Light rain. High 81°, low 66°.

Pressure30.06 inHg
Wind10.1 mph E
Humidity78%
Visibility—
Dew point71°
Mon, 1782° / 68°0.04Light rain
MorningLight rain72°feels 72°
AfternoonLight rain79°feels 79°
EveningLight rain77°feels 78°
OvernightLight rain71°feels 72°
82 °Light rain

O'Fallon, Monday, 17 August

Light rain. High 82°, low 68°.

Pressure30.03 inHg
Wind8.5 mph NE
Humidity77%
Visibility—
Dew point70°

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.