Weather forecast for todayO'Fallon, IL

Today
Tomorrow
Long-term
YearJFMAMJJASOctoberND

Weather forecast for today

Current condition 5:29 pm CDT

  • 57°F
  • Feels like:
    57°F
Sunny
Sunny
  • Precipitation: 0"
  • Wind: 1mphN 0°
  • Humidity: 45%
  • Dewpoint: 37°F
  • Pressure: 30.46"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
At the moment, in O'Fallon, the sun is casting warm light across the landscape.
The temperature is a moderate 57.2°F.

Saturday Oct 17, 2026

  • min.
  • 37°F
Clear
Clear
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 2mphESE 118°
  • Humidity: 79%
  • UV index: 0
  • Sunrise: 7:11 am CDT
  • Sunset: 6:18 pm CDT
  • ▼
In O'Fallon, for the rest of Saturday, the sky will remain completely clear.
The lowest predicted temperature is a wintry 37.4°F.
Sunrise was at 7:11 am and sunset will be at 6:18 pm; the daylight will last for 11h and 8min.

Hourly overview

Hourly temperatures

Warmest hour: 6 pm 55°C.
Coldest hour: 1 am 41°C.

Chance of precipitation

Highest chance: 1 am 3%.

Hourly weather forecast

  • 6 pm
  • 55°F
  • Feels like:
    55°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 1mphNNE 24°
  • Humidity: 52%
  • Pressure: 30.45"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunset: 6:18 pm
  • 7 pm
  • 52°F
  • Feels like:
    52°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 0mphNE 45°
  • Humidity: 67%
  • Pressure: 30.45"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 8 pm
  • 48°F
  • Feels like:
    48°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 0mphENE 57°
  • Humidity: 72%
  • Pressure: 30.45"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 9 pm
  • 46°F
  • Feels like:
    46°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 0mphENE 76°
  • Humidity: 81%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 pm
  • 45°F
  • Feels like:
    45°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 1mphESE 116°
  • Humidity: 86%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 11 pm
  • 43°F
  • Feels like:
    43°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 1mphSE 136°
  • Humidity: 86%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 12 am
  • 43°F
  • Feels like:
    43°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 1mphSE 130°
  • Humidity: 87%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 1 am
  • 41°F
  • Feels like:
    41°F
Clear
Clear
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 1mphSE 143°
  • Humidity: 89%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 2 am
  • 41°F
  • Feels like:
    41°F
Clear
Clear
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 1mphSE 141°
  • Humidity: 89%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 3 am
  • 39°F
  • Feels like:
    39°F
Clear
Clear
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 2mphSSE 149°
  • Humidity: 89%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
For the remainder of Saturday, primarily bright and sunny weather is anticipated.
The temperature will vary between a maximum of 55.4°F and a minimum of 42.8°F.
Updated: Oct 17, 2026 @ 22:29:21 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

The temperature at 5:29 pm CDT in O'Fallon is 57.2°F.

Today, sunny and cloud-free conditions are expected.

On Saturday, in O'Fallon, sunrise was at 7:11 am and sunset will be at 6:18 pm (CDT).

In O'Fallon, today, there will be 11h and 8min of daylight.
Today
Tomorrow
Long-term
YearJFMAMJJASOctoberND

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O'Fallon, Illinois, USA

  • en: O'Fallon, Illinois, USA
  • es: O'Fallon, Illinois, EE.UU.
  • hr: O'Falon, Ilinois, SAD
  • mk: O'Falon, Ilinois, SAD
  • sr: O'Falon, Ilinois, SAD
  • zh: O'Fallon, 伊利诺伊, 美国
  • Latitude: 38.592323°
  • Longitude: -89.910991°
  • Elevation: 554 ft
  • Current time: 5:29pm CDT
  • Sunrise: 7:11 am CDT
  • Sunset: 6:18 pm CDT
  • Timezone: America/Chicago

Nearby O'Fallon, Illinois, USA

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