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As of 14:34 CDT

Weather in O'Fallon, MO

90°Current weather

O'Fallon, Saturday, 8 August, 14:34

Clear. Feels like 100°. High 90°, low 69°.

Pressure30.00 inHg
Wind3 mph SW
Humidity62%
Visibility6.2 mi
Dew point75°
Sun, 0998° / 73°0Overcast
98 °Overcast

O'Fallon, Sunday, 9 August

Overcast. High 98°, low 73°.

Pressure29.94 inHg
Wind13.2 mph S
Humidity48%
Visibility6.2 mi
Dew point70°
Mon, 10101° / 75°0Clear
101 °Clear

O'Fallon, Monday, 10 August

Clear. High 101°, low 75°.

Pressure29.94 inHg
Wind12.9 mph SW
Humidity43%
Visibility6.2 mi
Dew point69°
Tue, 11101° / 78°0.01Light rain
101 °Light rain

O'Fallon, Tuesday, 11 August

Light rain. High 101°, low 78°.

Pressure29.88 inHg
Wind4.9 mph SW
Humidity41%
Visibility6.2 mi
Dew point67°
Wed, 1290° / 74°0.02Light rain
90 °Light rain

O'Fallon, Wednesday, 12 August

Light rain. High 90°, low 74°.

Pressure29.83 inHg
Wind3.4 mph SW
Humidity61%
Visibility6.2 mi
Dew point69°
Thu, 1380° / 70°0.69Rain
80 °Rain

O'Fallon, Thursday, 13 August

Rain. High 80°, low 70°.

Pressure29.88 inHg
Wind9.1 mph N
Humidity83%
Visibility—
Dew point73°
Fri, 1478° / 62°0Light rain
78 °Light rain

O'Fallon, Friday, 14 August

Light rain. High 78°, low 62°.

Pressure30.15 inHg
Wind11.3 mph NE
Humidity46%
Visibility—
Dew point53°
Sat, 1582° / 59°0Overcast
82 °Overcast

O'Fallon, Saturday, 15 August

Overcast. High 82°, low 59°.

Pressure30.24 inHg
Wind8.9 mph E
Humidity41%
Visibility—
Dew point51°
Sun, 1678° / 65°0.08Light rain
78 °Light rain

O'Fallon, Sunday, 16 August

Light rain. High 78°, low 65°.

Pressure30.15 inHg
Wind11 mph S
Humidity74%
Visibility—
Dew point66°
Mon, 1798° / 72°0.23Rain
98 °Rain

O'Fallon, Monday, 17 August

Rain. High 98°, low 72°.

Pressure29.88 inHg
Wind14.8 mph SW
Humidity44%
Visibility—
Dew point66°
Tue, 1889° / 73°0Overcast
89 °Overcast

O'Fallon, Tuesday, 18 August

Overcast. High 89°, low 73°.

Pressure29.97 inHg
Wind8.7 mph NE
Humidity59%
Visibility—
Dew point69°
Wed, 1996° / 73°0Overcast
96 °Overcast

O'Fallon, Wednesday, 19 August

Overcast. High 96°, low 73°.

Pressure29.88 inHg
Wind7.8 mph E
Humidity51%
Visibility—
Dew point69°
Thu, 2083° / 74°1.38Heavy rain
83 °Heavy rain

O'Fallon, Thursday, 20 August

Heavy rain. High 83°, low 74°.

Pressure29.88 inHg
Wind9.7 mph SE
Humidity70%
Visibility—
Dew point71°
Fri, 2183° / 70°0.02Light rain
83 °Light rain

O'Fallon, Friday, 21 August

Light rain. High 83°, low 70°.

Pressure29.94 inHg
Wind8 mph NE
Humidity79%
Visibility—
Dew point67°
Sat, 2286° / 68°0Overcast
86 °Overcast

O'Fallon, Saturday, 22 August

Overcast. High 86°, low 68°.

Pressure29.94 inHg
Wind5.2 mph E
Humidity53%
Visibility—
Dew point63°
Sun, 2371° / 60°0.02Light rain
71 °Light rain

O'Fallon, Sunday, 23 August

Light rain. High 71°, low 60°.

Pressure30.12 inHg
Wind12 mph NE
Humidity63%
Visibility—
Dew point57°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for O'Fallon, MO are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in O'Fallon, MO since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.