EN
English Español

As of 21:00 CDT

Weather in O'Fallon, MO

82°Current weather

O'Fallon, Saturday, 8 August, 21:00

Clear. Feels like 88°. High 90°, low 69°.

Pressure29.97 inHg
Wind1 mph SW
Humidity80%
Visibility6.2 mi
Dew point74°

Two-week outlook for O'Fallon, MO: week one averages a high of 91.6° and week two 81°, so week two runs 10.6° cooler than week one. Around 1.9 inches of precipitation are expected over the 14 days, across 7 wet days. The nearest weekend, August 8: 90°, dry.

Week one vs week two

WeekHighLowPrecipitationVs normal
1st (August 8 – August 14)91.6°72.5°1.5 in / 4 d+6°
2nd (August 15 – August 21)81°65.9°0.4 in / 3 d-4.6°

Weekend weather

Sat, August 8
Clear
90°69°
no precip.
Sun, August 9
Partly cloudy
95°72°
no precip.
Sat, August 15
Rain
81°68°
0.24 in
Sun, August 16
Overcast
82°69°
no precip.
Sun, 0995° / 72°0Partly cloudy
95 °Partly cloudy

O'Fallon, Sunday, 9 August

Partly cloudy. High 95°, low 72°.

Pressure29.94 inHg
Wind12.8 mph S
Humidity50%
Visibility6.2 mi
Dew point71°
Mon, 10101° / 77°0Light rain
101 °Light rain

O'Fallon, Monday, 10 August

Light rain. High 101°, low 77°.

Pressure29.91 inHg
Wind12.2 mph SW
Humidity43%
Visibility6.2 mi
Dew point69°
Tue, 11104° / 77°0.05Light rain
104 °Light rain

O'Fallon, Tuesday, 11 August

Light rain. High 104°, low 77°.

Pressure29.85 inHg
Wind12.7 mph SW
Humidity40%
Visibility6.2 mi
Dew point67°
Wed, 1293° / 74°0.26Rain
93 °Rain

O'Fallon, Wednesday, 12 August

Rain. High 93°, low 74°.

Pressure29.85 inHg
Wind5.5 mph N
Humidity63%
Visibility6.2 mi
Dew point71°
Thu, 1381° / 70°0.84Rain
81 °Rain

O'Fallon, Thursday, 13 August

Rain. High 81°, low 70°.

Pressure29.88 inHg
Wind17.8 mph NE
Humidity70%
Visibility—
Dew point69°
Fri, 1477° / 69°0.34Rain
77 °Rain

O'Fallon, Friday, 14 August

Rain. High 77°, low 69°.

Pressure30.03 inHg
Wind14.9 mph E
Humidity81%
Visibility—
Dew point69°
Sat, 1581° / 68°0.24Rain
81 °Rain

O'Fallon, Saturday, 15 August

Rain. High 81°, low 68°.

Pressure30.15 inHg
Wind15.1 mph SE
Humidity68%
Visibility—
Dew point67°
Sun, 1682° / 69°0Overcast
82 °Overcast

O'Fallon, Sunday, 16 August

Overcast. High 82°, low 69°.

Pressure30.06 inHg
Wind10.2 mph E
Humidity77%
Visibility—
Dew point70°
Mon, 1784° / 69°0.04Light rain
84 °Light rain

O'Fallon, Monday, 17 August

Light rain. High 84°, low 69°.

Pressure30.03 inHg
Wind9.4 mph NE
Humidity72%
Visibility—
Dew point69°
Tue, 1882° / 70°0.05Light rain
82 °Light rain

O'Fallon, Tuesday, 18 August

Light rain. High 82°, low 70°.

Pressure30.03 inHg
Wind10.1 mph SW
Humidity85%
Visibility—
Dew point72°
Wed, 1988° / 69°0Overcast
88 °Overcast

O'Fallon, Wednesday, 19 August

Overcast. High 88°, low 69°.

Pressure29.91 inHg
Wind13.8 mph NE
Humidity53%
Visibility—
Dew point66°
Thu, 2077° / 60°0Mostly clear
77 °Mostly clear

O'Fallon, Thursday, 20 August

Mostly clear. High 77°, low 60°.

Pressure30.03 inHg
Wind11.2 mph NE
Humidity51%
Visibility—
Dew point54°
Fri, 2173° / 58°0.1Light rain
73 °Light rain

O'Fallon, Friday, 21 August

Light rain. High 73°, low 58°.

Pressure30.00 inHg
Wind11.2 mph E
Humidity51%
Visibility—
Dew point52°

About this forecast

Can I plan a trip on a 2-week forecast?

Week one is solid for planning — accuracy is high. Week two shows the trend: go by the averages and the comparison with normal, and check the details closer to the date.

What does the "Vs normal" column mean?

It is the gap between the forecast and the climate normal for those same dates in O'Fallon, MO, computed over 60 years. A positive value means the week runs warmer than usual.

Why are weekends shown separately?

Saturday and Sunday plans are what people check most, so we give them their own cards with temperature and precipitation.