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As of 09:30 CDT

Weather in O'Fallon, IL

54°Current weather

O'Fallon, Wednesday, 21 October, 09:30

Clear. Feels like 54°. High 74°, low 46°.

Pressure30.30 inHg
Wind0 mph N
Humidity95%
Visibility6.2 mi
Dew point53°

Two-week outlook for O'Fallon, IL: week one averages a high of 73.3° and week two 66.8°, so week two runs 6.5° cooler than week one. Around 1.9 inches of precipitation are expected over the 14 days, across 5 wet days. The nearest weekend, October 24: 71°, dry.

Week one vs week two

WeekHighLowPrecipitationVs normal
1st (October 21 – October 27)73.3°51.1°0.0 in / 0 d—
2nd (October 28 – November 3)66.8°55.8°1.9 in / 5 d—

Weekend weather

Sat, October 24
Overcast
71°50°
no precip.
Sun, October 25
Overcast
75°52°
no precip.
Sat, October 31
Overcast
75°57°
no precip.
Sun, November 1
Light rain
68°59°
0.46 in
Thu, 2275° / 49°0Clear
75 °Clear

O'Fallon, Thursday, 22 October

Clear. High 75°, low 49°.

Pressure30.27 inHg
Wind1.7 mph N
Humidity52%
Visibility6.2 mi
Dew point52°
Fri, 2372° / 51°0Clear
72 °Clear

O'Fallon, Friday, 23 October

Clear. High 72°, low 51°.

Pressure30.30 inHg
Wind4.3 mph SE
Humidity50%
Visibility6.2 mi
Dew point50°
Sat, 2471° / 50°0Overcast
71 °Overcast

O'Fallon, Saturday, 24 October

Overcast. High 71°, low 50°.

Pressure30.36 inHg
Wind4.3 mph SE
Humidity52%
Visibility6.2 mi
Dew point50°
Sun, 2575° / 52°0Overcast
75 °Overcast

O'Fallon, Sunday, 25 October

Overcast. High 75°, low 52°.

Pressure30.36 inHg
Wind7.6 mph S
Humidity45%
Visibility—
Dew point48°
Mon, 2673° / 53°0Overcast
73 °Overcast

O'Fallon, Monday, 26 October

Overcast. High 73°, low 53°.

Pressure30.24 inHg
Wind6.9 mph S
Humidity40%
Visibility—
Dew point44°
Tue, 2774° / 57°0Overcast
74 °Overcast

O'Fallon, Tuesday, 27 October

Overcast. High 74°, low 57°.

Pressure30.24 inHg
Wind6.7 mph S
Humidity37%
Visibility—
Dew point42°
Wed, 2878° / 59°0Mostly clear
78 °Mostly clear

O'Fallon, Wednesday, 28 October

Mostly clear. High 78°, low 59°.

Pressure30.12 inHg
Wind11.7 mph SW
Humidity37%
Visibility—
Dew point45°
Thu, 2969° / 58°0.24Rain
69 °Rain

O'Fallon, Thursday, 29 October

Rain. High 69°, low 58°.

Pressure30.12 inHg
Wind9.8 mph SW
Humidity87%
Visibility—
Dew point59°
Fri, 3061° / 53°0.07Light rain
61 °Light rain

O'Fallon, Friday, 30 October

Light rain. High 61°, low 53°.

Pressure30.18 inHg
Wind9.6 mph E
Humidity72%
Visibility—
Dew point48°
Sat, 3175° / 57°0Overcast
75 °Overcast

O'Fallon, Saturday, 31 October

Overcast. High 75°, low 57°.

Pressure29.91 inHg
Wind18.6 mph S
Humidity47%
Visibility—
Dew point51°
Sun, 0168° / 59°0.46Light rain
68 °Light rain

O'Fallon, Sunday, 1 November

Light rain. High 68°, low 59°.

Pressure29.88 inHg
Wind22.7 mph S
Humidity90%
Visibility—
Dew point58°
Mon, 0263° / 54°0.84Rain
63 °Rain

O'Fallon, Monday, 2 November

Rain. High 63°, low 54°.

Pressure29.83 inHg
Wind11.5 mph W
Humidity95%
Visibility—
Dew point54°
Tue, 0354° / 52°0.34Rain
54 °Rain

O'Fallon, Tuesday, 3 November

Rain. High 54°, low 52°.

Pressure29.65 inHg
Wind17.2 mph NW
Humidity91%
Visibility—
Dew point51°

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, IL, 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.