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As of 04:03 CDT

Weather in O'Fallon, MO

74°Current weather

O'Fallon, Sunday, 9 August, 04:03

Clear. Feels like 76°. High 96°, low 73°.

Pressure29.97 inHg
Wind4 mph S
Humidity91%
Visibility6.2 mi
Dew point71°

10-day forecast for O'Fallon, MO: 65° to 101°, with precipitation expected on 6 days. The table below breaks each day into morning, afternoon, evening and overnight.

97°
Best day: Tuesday, August 18
100° · 0.63 in
Worst day: Monday, August 10

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

Mon, 10100° / 70°0.63Heavy rain
MorningOvercast79°feels 79°
AfternoonOvercast99°feels 102°
EveningRain83°feels 89°
OvernightClear83°feels 87°
100 °Heavy rain

O'Fallon, Monday, 10 August

Heavy rain. High 100°, low 70°.

Pressure29.91 inHg
Wind12.8 mph SW
Humidity41%
Visibility6.2 mi
Dew point68°
Tue, 11101° / 70°0.05Light rain
MorningPartly cloudy78°feels 79°
AfternoonClear100°feels 102°
EveningOvercast87°feels 89°
OvernightOvercast73°feels 74°
101 °Light rain

O'Fallon, Tuesday, 11 August

Light rain. High 101°, low 70°.

Pressure29.88 inHg
Wind12.4 mph SW
Humidity42%
Visibility6.2 mi
Dew point68°
Wed, 1295° / 76°0.01Light rain
MorningOvercast81°feels 83°
AfternoonMostly clear96°feels 103°
EveningOvercast86°feels 92°
OvernightLight rain83°feels 84°
95 °Light rain

O'Fallon, Wednesday, 12 August

Light rain. High 95°, low 76°.

Pressure29.83 inHg
Wind7.3 mph NW
Humidity49%
Visibility6.2 mi
Dew point70°
Thu, 1389° / 73°0.09Light rain
MorningLight rain78°feels 81°
AfternoonLight rain87°feels 93°
EveningLight rain77°feels 78°
OvernightOvercast74°feels 76°
89 °Light rain

O'Fallon, Thursday, 13 August

Light rain. High 89°, low 73°.

Pressure29.88 inHg
Wind14.2 mph E
Humidity57%
Visibility—
Dew point70°
Fri, 1474° / 65°0.07Light rain
MorningLight rain67°feels 67°
AfternoonLight rain71°feels 71°
EveningLight rain72°feels 73°
OvernightLight rain68°feels 69°
74 °Light rain

O'Fallon, Friday, 14 August

Light rain. High 74°, low 65°.

Pressure30.06 inHg
Wind13.3 mph E
Humidity82%
Visibility—
Dew point64°
Sat, 1588° / 66°0.09Light rain
MorningLight rain70°feels 71°
AfternoonLight rain78°feels 80°
EveningLight rain82°feels 87°
OvernightLight rain74°feels 76°
88 °Light rain

O'Fallon, Saturday, 15 August

Light rain. High 88°, low 66°.

Pressure30.12 inHg
Wind10.7 mph E
Humidity77%
Visibility—
Dew point68°
Sun, 1693° / 71°0Overcast
MorningOvercast77°feels 80°
AfternoonOvercast89°feels 98°
EveningOvercast85°feels 93°
OvernightOvercast76°feels 78°
93 °Overcast

O'Fallon, Sunday, 16 August

Overcast. High 93°, low 71°.

Pressure30.03 inHg
Wind9.4 mph NE
Humidity58%
Visibility—
Dew point71°
Mon, 1788° / 71°0.04Light rain
MorningLight rain75°feels 77°
AfternoonLight rain85°feels 90°
EveningLight rain80°feels 83°
OvernightLight rain73°feels 75°
88 °Light rain

O'Fallon, Monday, 17 August

Light rain. High 88°, low 71°.

Pressure30.06 inHg
Wind9.1 mph E
Humidity57%
Visibility—
Dew point67°
Tue, 1897° / 69°0Partly cloudy
MorningPartly cloudy76°feels 78°
AfternoonPartly cloudy91°feels 97°
EveningPartly cloudy88°feels 95°
OvernightPartly cloudy79°feels 82°
97 °Partly cloudy

O'Fallon, Tuesday, 18 August

Partly cloudy. High 97°, low 69°.

Pressure29.94 inHg
Wind10.2 mph E
Humidity51%
Visibility—
Dew point68°

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, MO 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.