Weather forecast for 10 days
O'Fallon, IL

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Weather forecast for the weekend

Saturday, May 3.

Mostly Sunny
5:57 am

7:55 pm
CDT
Mostly Sunny
63°F / 46°F
  • Wind: 10mph N
  • Humidity: 70%
  • Precip. probability: 24%
  • Precipitation: 0"
  • UV index: 8
On Saturday, in O'Fallon, sunshine will prevail for most of the day.
Rainfall is not forecasted. Temperatures will oscillate between a comfortable 62.6°F at their highest and a chilly 46.4°F at their lowest.
The expected daily high is projected to match April's typical maximum of 64.9°F.
Sunrise will be at 5:57 am and sunset at 7:55 pm; the daylight will last for 13h and 57min.

Sunday, May 4.

Sunny
5:56 am

7:56 pm
CDT
Sunny
64°F / 48°F
  • Wind: 8mph NE
  • Humidity: 60%
  • Precip. probability: 12%
  • Precipitation: 0"
  • UV index: 8
On Sunday, May 4, conditions remain stable and sunny, with little cloud presence.
Rainfall is not anticipated. The temperature is predicted to vary between a maximum of an enjoyable 64.4°F and a minimum of a chilly 48.2°F.
Sunday's peak is forecasted to reflect the usual April high temperature of 64.9°F.
Sunrise will be at 5:56 am and sunset at 7:56 pm; the daylight will last for 13h and 59min.

Frequently asked questions

What is the weather forecast for O'Fallon for Saturday?
On Saturday, in O'Fallon, open skies and radiant sunshine are expected.
Will it rain on Saturday?
No, it will not rain on Saturday.
What will be the maximum temperature in O'Fallon on Saturday?
On Saturday, the maximum temperature will be 62.6°F, while the minimum temperature will be 46.4°F.
What is the weather forecast for O'Fallon for Sunday?
On Sunday, in O'Fallon, the outlook remains bright and sunny.
Will it rain on Sunday?
No, it will not rain on Sunday.
What will be the maximum temperature on Sunday?
On Sunday, the highest temperature will be 64.4°F, while the lowest temperature will be 48.2°F.
What is the weather forecast for O'Fallon for the next ten days?
In O'Fallon, weather will be unstable, and a combination of clear, wet, unstable and overcast weather is predicted for the next ten days.
Will it rain in the next ten days?
Rainfall is predicted for Tuesday through Friday in O'Fallon. With moderate precipitation of 0.47", Wednesday will be the day with the most rainfall.
How warm will it be in the next ten days?
The maximum temperature will range between 62.6°F and 77°F, as the minimum temperature will be between 46.4°F and 62.6°F.
What will be the warmest and the coldest days in O'Fallon?
The warmest day will be next Tuesday, with a maximum of 77°F. Saturday will be the coldest day, with a maximum temperature of 62.6°F.

Long-term weather forecast

TueApr 29.
  • min.
  • 55°F
Showers
Showers
  • Wind: 4mph NNE
  • Humidity: 86%
  • UV index: 0
  • Precip. probability: 50%
  • Precipitation: 0.04"
  • 6:02 am 7:51 pm CDT
WedApr 30.
  • 72°F
  • 63°F
AM Thundershowers
AM Thundershowers
  • Wind: 10mph ESE
  • Humidity: 86%
  • UV index: 4
  • Precip. probability: 91%
  • Precipitation: 0.47"
  • 6:01 am 7:52 pm CDT
ThuMay 1.
  • 72°F
  • 57°F
Scattered Thunderstorms
Scattered Thunderstorms
  • Wind: 13mph SW
  • Humidity: 81%
  • UV index: 5
  • Precip. probability: 55%
  • Precipitation: 0.31"
  • 6:00 am 7:53 pm CDT
FriMay 2.
  • 68°F
  • 50°F
PM Showers
PM Showers
  • Wind: 7mph WNW
  • Humidity: 74%
  • UV index: 5
  • Precip. probability: 42%
  • Precipitation: 0.2"
  • 5:59 am 7:54 pm CDT
SatMay 3.
  • 63°F
  • 46°F
Mostly Sunny
Mostly Sunny
  • Wind: 10mph N
  • Humidity: 70%
  • UV index: 8
  • Precip. probability: 24%
  • Precipitation: 0"
  • 5:57 am 7:55 pm CDT
SunMay 4.
  • 64°F
  • 48°F
Sunny
Sunny
  • Wind: 8mph NE
  • Humidity: 60%
  • UV index: 8
  • Precip. probability: 12%
  • Precipitation: 0"
  • 5:56 am 7:56 pm CDT
MonMay 5.
  • 70°F
  • 50°F
Mostly Sunny
Mostly Sunny
  • Wind: 7mph ENE
  • Humidity: 60%
  • UV index: 8
  • Precip. probability: 5%
  • Precipitation: 0"
  • 5:55 am 7:56 pm CDT
TueMay 6.
  • 77°F
  • 55°F
Mostly Sunny
Mostly Sunny
  • Wind: 7mph SE
  • Humidity: 61%
  • UV index: 8
  • Precip. probability: 6%
  • Precipitation: 0"
  • 5:54 am 7:57 pm CDT
WedMay 7.
  • 75°F
  • 57°F
Partly Cloudy
Partly Cloudy
  • Wind: 7mph E
  • Humidity: 65%
  • UV index: 8
  • Precip. probability: 15%
  • Precipitation: 0"
  • 5:53 am 7:58 pm CDT
ThuMay 8.
  • 75°F
  • 55°F
Partly Cloudy
Partly Cloudy
  • Wind: 9mph ENE
  • Humidity: 62%
  • UV index: 8
  • Precip. probability: 18%
  • Precipitation: 0"
  • 5:52 am 7:59 pm CDT
The weather will be unstable for the next ten days, and a mix of sun-filled, rainy, thunderstorm-prone and gloomy weather is expected.
Rainfall is expected on Tuesday through Friday.
Substantial differences in temperature are forecasted in the coming days. Forecast highs will fluctuate between 62.6°F and 77°F, while the lowest nightly temperature differences will be also quite pronounced, as nighttime lows are forecast to fall between 46.4°F and 62.6°F.
The warmest day will be next Tuesday, with a maximum of 77°F; Saturday will be the coldest day, with the highest temperature of 62.6°F.
Updated: Apr 30, 2025 @ 03:05:12 UTC
Published by: Weather U.S. | About Us
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