Weather forecast for 10 daysIlliopolis, IL

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 59°F
  • 36°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 6mphWSW 253°
  • Humidity: 50%
  • UV index: 4
  • Sunrise: 7:09 am CDT
  • Sunset: 6:14 pm CDT
  • ▼
Today, in Illiopolis, sunshine is expected with little to no cloud cover.
The highest predicted temperature is a refreshing 59°F, while the lowest temperature will be a wintry 35.6°F.
Today's forecasted high will be a couple of degrees lower than the typical October high of 63.9°F.
Sunrise was at 7:09 am and sunset will be at 6:14 pm; the daylight will last for 11h and 5min.

Sunday Oct 18, 2026

  • 66°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 11mphS 179°
  • Humidity: 46%
  • UV index: 4
  • Sunrise: 7:10 am CDT
  • Sunset: 6:13 pm CDT
  • ▼
Tomorrow, sun-filled conditions are expected to persist.
The day's temperature range will span from a high of a breezy 66.2°F to a minimum of a cold 37.4°F.
Tomorrow, the forecasted temperature will match October's typical high of 63.9°F.
Sunrise will be at 7:10 am and sunset at 6:13 pm; tomorrow's daylight will last for 11h and 2min.

10-day overview

Daily temperatures

Warmest period: Friday - Sunday 79°C.
Coldest day: today 59°C.

Chance of precipitation

Highest chance: Sunday 25.10. 10%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 59°F
  • 36°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 6mphWSW 253°
  • Humidity: 50%
  • UV index: 4
  • Sunrise: 7:09 am CDT
  • Sunset: 6:14 pm CDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 66°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 11mphS 179°
  • Humidity: 46%
  • UV index: 4
  • Sunrise: 7:10 am CDT
  • Sunset: 6:13 pm CDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 72°F
  • 39°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphSSE 165°
  • Humidity: 50%
  • UV index: 4
  • Sunrise: 7:11 am CDT
  • Sunset: 6:11 pm CDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 73°F
  • 43°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 5mphSE 125°
  • Humidity: 50%
  • UV index: 4
  • Sunrise: 7:12 am CDT
  • Sunset: 6:10 pm CDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 75°F
  • 43°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 8%
  • Precipitation: 0"
  • Wind: 4mphS 185°
  • Humidity: 50%
  • UV index: 4
  • Sunrise: 7:13 am CDT
  • Sunset: 6:09 pm CDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 77°F
  • 45°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 5mphSE 144°
  • Humidity: 50%
  • UV index: 4
  • Sunrise: 7:15 am CDT
  • Sunset: 6:07 pm CDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 79°F
  • 46°F
Sunny
Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 7mphESE 120°
  • Humidity: 47%
  • UV index: 4
  • Sunrise: 7:16 am CDT
  • Sunset: 6:06 pm CDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 79°F
  • 48°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 8mphSE 144°
  • Humidity: 47%
  • UV index: 4
  • Sunrise: 7:17 am CDT
  • Sunset: 6:05 pm CDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 79°F
  • 50°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 10%
  • Precipitation: 0"
  • Wind: 7mphSSW 197°
  • Humidity: 49%
  • UV index: 4
  • Sunrise: 7:18 am CDT
  • Sunset: 6:03 pm CDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 77°F
  • 50°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 8%
  • Precipitation: 0"
  • Wind: 6mphS 169°
  • Humidity: 55%
  • UV index: 4
  • Sunrise: 7:19 am CDT
  • Sunset: 6:02 pm CDT
  • ▼
In the days ahead, a combination of mostly clear and cloud-filled weather is anticipated.
Rain is not predicted in Illiopolis in the upcoming days.
Significant changes in temperature are expected in the next ten days. Maximum temperatures are forecasted between 59°F and 78.8°F, while the lowest nightly temperature differences will be also quite pronounced, as temperatures overnight will fluctuate from 35.6°F up to 50°F.
The warmest days in Illiopolis will be Friday through next Sunday, with a maximum of 78.8°F; today is the coldest day, with a maximum temperature of 59°F.
Updated: Oct 17, 2026 @ 15:17:12 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Today, a sun-drenched sky is anticipated.

Today, the maximum temperature will be 59°F, while the minimum temperature will be 35.6°F.
The maximum temperature today will be moderately lower than the average highest temperature in October. The lowest temperature will be significantly lower than the average low of 47.8°F.

On Saturday, in Illiopolis, sunrise was at 7:09 am and sunset will be at 6:14 pm (CDT).

In Illiopolis, the length of the day today will be 11h and 5min.

On Sunday, sunny and dry conditions are anticipated.

Tomorrow, the highest temperature in Illiopolis, Illinois, will be 66.2°F, while the lowest temperature will be 37.4°F.
Tomorrow, the highest temperature will be in line with the average maximum temperature in October. The lowest temperature tomorrow will be significantly lower than the average low of 47.8°F.

On Sunday, in Illiopolis, sunrise will be at 7:10 am and sunset at 6:13 pm (CDT).

In Illiopolis, the length of the day tomorrow will be 11h and 2min.