Weather forecast for tomorrowO'Fallon, MO
Weather forecast for tomorrow
Sunday Oct 18, 2026
- 68°F
- 39°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 7mphSSE 167°
- Humidity: 51%
- UV index: 5
- Sunrise: 7:15 am CDT
- Sunset: 6:20 pm CDT
- details ▼
Tomorrow, in O'Fallon, the weather remains calm, bright, and sunny.
Daytime will experience a high of a delightful 68°F, significantly differing from the forecasted night low of a cold 39.2°F.
The anticipated maximum temperature will closely reflect October's average high of 66.2°F.
Sunrise will be at 7:15 am and sunset at 6:20 pm; tomorrow's daylight will last for 11h and 5min.
Daytime will experience a high of a delightful 68°F, significantly differing from the forecasted night low of a cold 39.2°F.
The anticipated maximum temperature will closely reflect October's average high of 66.2°F.
Sunrise will be at 7:15 am and sunset at 6:20 pm; tomorrow's daylight will last for 11h and 5min.
Hourly overview
Hourly temperatures
Warmest hour: 3 pm 66°C.
Coldest hour: 6 am 37°C.
Coldest hour: 6 am 37°C.
Chance of precipitation
Highest chance: 6 am 5%.
Hourly weather forecast
- 12 am
- 43°F
- Feels like:43°F
Clear
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 2mphSSE 164°
- Humidity: 84%
- Pressure: 30.45"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 2 am
- 41°F
- Feels like:41°F
Clear
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 2mphSSE 160°
- Humidity: 88%
- Pressure: 30.47"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 4 am
- 39°F
- Feels like:39°F
Clear
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 2mphS 175°
- Humidity: 89%
- Pressure: 30.47"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 6 am
- 37°F
- Feels like:37°F
Clear
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 2mphS 177°
- Humidity: 92%
- Pressure: 30.47"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunrise: 7:15 am
- 8 am
- 41°F
- Feels like:41°F
Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 2mphS 170°
- Humidity: 87%
- Pressure: 30.47"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 am
- 52°F
- Feels like:50°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 6mphS 170°
- Humidity: 58%
- Pressure: 30.47"Hg
- Visibility: 10mi
- UV index: 2
- details ▼
- 12 pm
- 61°F
- Feels like:59°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 6mphS 173°
- Humidity: 39%
- Pressure: 30.45"Hg
- Visibility: 10mi
- UV index: 4
- details ▼
- 2 pm
- 64°F
- Feels like:64°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 6mphSSE 163°
- Humidity: 33%
- Pressure: 30.39"Hg
- Visibility: 10mi
- UV index: 4
- details ▼
- 4 pm
- 66°F
- Feels like:66°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 7mphSSE 160°
- Humidity: 33%
- Pressure: 30.36"Hg
- Visibility: 10mi
- UV index: 1
- details ▼
- 6 pm
- 61°F
- Feels like:61°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 5mphSSE 148°
- Humidity: 44%
- Pressure: 30.33"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunset: 6:20 pm
- 8 pm
- 55°F
- Feels like:55°F
Clear
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 3mphSE 140°
- Humidity: 58%
- Pressure: 30.36"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 pm
- 50°F
- Feels like:50°F
Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 4mphSSE 157°
- Humidity: 72%
- Pressure: 30.36"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Tomorrow, sunshine is expected.
The temperature will be between a minimum of 37.4°F and a maximum of 66.2°F. The warmest part of the day will be at 3 pm and 4 pm.
Tomorrow, the temperature is forecasted to be in line with the usual maximum for October. The lowest temperature tomorrow is more alike with November's average minimum of 37.6°F than the average low in October of 48.7°F.
The temperature will be between a minimum of 37.4°F and a maximum of 66.2°F. The warmest part of the day will be at 3 pm and 4 pm.
Tomorrow, the temperature is forecasted to be in line with the usual maximum for October. The lowest temperature tomorrow is more alike with November's average minimum of 37.6°F than the average low in October of 48.7°F.
Updated: Oct 17, 2026 @ 18:29:45 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, in O'Fallon, sun-filled conditions are expected to persist.
Tomorrow, the highest temperature in O'Fallon, Missouri, will be 68°F, while the lowest temperature will be 39.2°F.
Tomorrow, the highest temperature will be in line with the average maximum temperature in October. The lowest temperature tomorrow will be uncommonly lower than the average low of 48.7°F.
Tomorrow, the highest temperature will be in line with the average maximum temperature in October. The lowest temperature tomorrow will be uncommonly lower than the average low of 48.7°F.
On Sunday, in O'Fallon, sunrise will be at 7:15 am and sunset at 6:20 pm (CDT).
In O'Fallon, the length of the day tomorrow will be 11h and 5min.
