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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°

Two-week outlook for O'Fallon, IL: week one averages a high of 89.6° and week two 79.9°, so week two runs 9.7° cooler than week one. Around 1.9 inches of precipitation are expected over the 14 days, across 8 wet days. The nearest weekend, August 8: 90°, dry.

Week one vs week two

WeekHighLowPrecipitationVs normal
1st (August 8 – August 14)89.6°71.4°1.5 in / 4 d—
2nd (August 15 – August 21)79.9°64.8°0.4 in / 4 d—

Weekend weather

Sat, August 8
Clear
90°70°
no precip.
Sun, August 9
Partly cloudy
95°72°
no precip.
Sat, August 15
Light rain
79°67°
0.17 in
Sun, August 16
Light rain
81°66°
0.05 in
Sun, 0995° / 72°0Partly cloudy
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
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
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
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
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
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
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
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
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°
Tue, 1881° / 69°0.03Light rain
81 °Light rain

O'Fallon, Tuesday, 18 August

Light rain. High 81°, low 69°.

Pressure30.00 inHg
Wind8.9 mph W
Humidity77%
Visibility—
Dew point72°
Wed, 1986° / 69°0Overcast
86 °Overcast

O'Fallon, Wednesday, 19 August

Overcast. High 86°, low 69°.

Pressure29.91 inHg
Wind11.7 mph N
Humidity60%
Visibility—
Dew point67°
Thu, 2075° / 58°0Mostly clear
75 °Mostly clear

O'Fallon, Thursday, 20 August

Mostly clear. High 75°, low 58°.

Pressure30.03 inHg
Wind10.8 mph NE
Humidity59%
Visibility—
Dew point56°
Fri, 2175° / 57°0.07Light rain
75 °Light rain

O'Fallon, Friday, 21 August

Light rain. High 75°, low 57°.

Pressure30.03 inHg
Wind10.3 mph E
Humidity57%
Visibility—
Dew point55°

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.