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As of 06:20 CDT

Weather in O'Fallon, IL

44°Current weather

O'Fallon, Wednesday, 21 October, 06:20

Clear. Feels like 44°. High 75°, low 44°.

Pressure30.27 inHg
Wind0 mph N
Humidity100%
Visibility6.2 mi
Dew point44°

Two-week outlook for O'Fallon, IL: week one averages a high of 72.7° and week two 61.8°, so week two runs 11° cooler than week one. Around 1.9 inches of precipitation are expected over the 14 days, across 4 wet days. The nearest weekend, October 24: 72°, dry.

Week one vs week two

WeekHighLowPrecipitationVs normal
1st (October 21 – October 27)72.7°51.5°0.0 in / 0 d—
2nd (October 28 – November 3)61.8°48.7°1.9 in / 4 d—

Weekend weather

Sat, October 24
Overcast
72°51°
no precip.
Sun, October 25
Overcast
76°53°
no precip.
Sat, October 31
Light rain
58°44°
0.09 in
Sun, November 1
Rain
57°51°
1.52 in
Thu, 2276° / 50°0Clear
76 °Clear

O'Fallon, Thursday, 22 October

Clear. High 76°, low 50°.

Pressure30.27 inHg
Wind1.6 mph NW
Humidity48%
Visibility6.2 mi
Dew point51°
Fri, 2373° / 52°0Clear
73 °Clear

O'Fallon, Friday, 23 October

Clear. High 73°, low 52°.

Pressure30.30 inHg
Wind4.9 mph SE
Humidity46%
Visibility6.2 mi
Dew point49°
Sat, 2472° / 51°0Overcast
72 °Overcast

O'Fallon, Saturday, 24 October

Overcast. High 72°, low 51°.

Pressure30.36 inHg
Wind5 mph SE
Humidity50%
Visibility6.2 mi
Dew point49°
Sun, 2576° / 53°0Overcast
76 °Overcast

O'Fallon, Sunday, 25 October

Overcast. High 76°, low 53°.

Pressure30.36 inHg
Wind7.4 mph S
Humidity39%
Visibility—
Dew point45°
Mon, 2674° / 54°0Overcast
74 °Overcast

O'Fallon, Monday, 26 October

Overcast. High 74°, low 54°.

Pressure30.27 inHg
Wind5.5 mph SW
Humidity38%
Visibility—
Dew point44°
Tue, 2762° / 57°0.01Light rain
62 °Light rain

O'Fallon, Tuesday, 27 October

Light rain. High 62°, low 57°.

Pressure30.21 inHg
Wind10.4 mph N
Humidity73%
Visibility—
Dew point51°
Wed, 2871° / 55°0Overcast
71 °Overcast

O'Fallon, Wednesday, 28 October

Overcast. High 71°, low 55°.

Pressure30.12 inHg
Wind10.8 mph W
Humidity51%
Visibility—
Dew point47°
Thu, 2958° / 44°0.01Light rain
58 °Light rain

O'Fallon, Thursday, 29 October

Light rain. High 58°, low 44°.

Pressure30.27 inHg
Wind16.8 mph NW
Humidity47%
Visibility—
Dew point34°
Fri, 3058° / 39°0Overcast
58 °Overcast

O'Fallon, Friday, 30 October

Overcast. High 58°, low 39°.

Pressure30.30 inHg
Wind6.6 mph E
Humidity37%
Visibility—
Dew point28°
Sat, 3158° / 44°0.09Light rain
58 °Light rain

O'Fallon, Saturday, 31 October

Light rain. High 58°, low 44°.

Pressure30.21 inHg
Wind14.1 mph SE
Humidity28%
Visibility—
Dew point24°
Sun, 0157° / 51°1.52Rain
57 °Rain

O'Fallon, Sunday, 1 November

Rain. High 57°, low 51°.

Pressure30.00 inHg
Wind13.6 mph S
Humidity94%
Visibility—
Dew point53°
Mon, 0261° / 58°0.04Light rain
61 °Light rain

O'Fallon, Monday, 2 November

Light rain. High 61°, low 58°.

Pressure30.00 inHg
Wind10.1 mph S
Humidity79%
Visibility—
Dew point53°
Tue, 0369° / 51°0.25Rain
69 °Rain

O'Fallon, Tuesday, 3 November

Rain. High 69°, low 51°.

Pressure29.91 inHg
Wind13.5 mph SE
Humidity65%
Visibility—
Dew point53°

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.