Weather forecast for todayO'Fallon, IL

Weather forecast for today

Current condition 2:18 pm CDT

  • 57°F
  • Feels like:
    57°F
Sunny
Sunny
  • Precipitation: 0"
  • Wind: 6mphNNW 340°
  • Humidity: 46%
  • Dewpoint: 37°F
  • Pressure: 30.5"Hg
  • Visibility: 10mi
  • UV index: 4
  • ▼
Currently, in O'Fallon, a calm and sunny day is perfect for outdoor activities.
The temperature is a mild 57.2°F. The current temperature is almost at the maximum expected 59°F for today.

Saturday Oct 17, 2026

  • 59°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 4mphN 355°
  • Humidity: 44%
  • UV index: 4
  • Sunrise: 7:11 am CDT
  • Sunset: 6:18 pm CDT
  • ▼
Today, a sun-drenched sky is anticipated.
Temperatures are predicted to peak at a mild 59°F and drop to a minimum of an icy 37.4°F.
It will be colder, as the maximum temperature reflects November's norm of 53.1°F instead of October's.
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 period: 3 pm - 5 pm 59°C.
Coldest period: 11 pm - 12 am 43°C.

Chance of precipitation

Highest chance: 11 pm - 12 am 2%.

Hourly weather forecast

  • 3 pm
  • 59°F
  • Feels like:
    59°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 5mphN 353°
  • Humidity: 43%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 3
  • ▼
  • 4 pm
  • 59°F
  • Feels like:
    59°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 5mphN 353°
  • Humidity: 42%
  • Pressure: 30.45"Hg
  • Visibility: 10mi
  • UV index: 1
  • ▼
  • 5 pm
  • 59°F
  • Feels like:
    59°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 4mphN 350°
  • Humidity: 43%
  • Pressure: 30.45"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 6 pm
  • 55°F
  • Feels like:
    55°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 2mphNNE 14°
  • Humidity: 53%
  • Pressure: 30.45"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunset: 6:18 pm
  • 7 pm
  • 50°F
  • Feels like:
    50°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 1mphNE 34°
  • Humidity: 68%
  • 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: 1mphNE 53°
  • 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: 80%
  • 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: 0mphESE 122°
  • Humidity: 83%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 11 pm
  • 43°F
  • Feels like:
    43°F
Clear
Clear
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphSE 142°
  • Humidity: 84%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 12 am
  • 43°F
  • Feels like:
    43°F
Clear
Clear
  • Precip. probability: 2%
  • Precipitation: 0"
  • Wind: 1mphSE 132°
  • Humidity: 87%
  • Pressure: 30.47"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
For the remainder of Saturday, bright skies and dry conditions are anticipated.
The temperature will vary between a minimum of 42.8°F and a maximum of 59°F. The warmest part of the day will be from 3 pm to 5 pm.
The maximum is expected to resemble November's average high of 53.1°F rather than October's. The minimum temperature today will be also more close to November's average low of 38.1°F than October's average of 48.7°F.
Updated: Oct 17, 2026 @ 19:18:18 UTC
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Currently (2:18 pm CDT) it is 57.2°F in O'Fallon.

On Saturday, a sun-drenched sky is anticipated.

Today, the highest temperature will be 59°F, while the lowest temperature will be 37.4°F.
Today, the highest temperature will be relatively lower than the average maximum temperature in October. Today, the lowest temperature will be uncommonly lower than the average low of 48.7°F.

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

In O'Fallon, the length of the day today will be 11h and 8min.