Weather forecast for 10 daysSullivan, IL

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 59°F
  • 36°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 5mphNE 44°
  • Humidity: 46%
  • UV index: 4
  • Sunrise: 7:06 am CDT
  • Sunset: 6:12 pm CDT
  • ▼
On Saturday, October 17, sunny skies and pleasant visibility are expected.
The temperature is predicted to vary between a maximum of a refreshing 59°F and a minimum of a wintry 35.6°F.
The predicted maximum temperature will be moderately lower than October's typical high of 63.9°F.
Sunrise was at 7:06 am and sunset will be at 6:12 pm; the daylight will last for 11h and 6min.

Sunday Oct 18, 2026

  • 66°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 9mphS 174°
  • Humidity: 46%
  • UV index: 4
  • Sunrise: 7:07 am CDT
  • Sunset: 6:11 pm CDT
  • ▼
Tomorrow, in Sullivan, sunshine and minimal clouds are also in the outlook.
Considerable temperature fluctuations from a high of a comfortable 66.2°F to a low of a cold 37.4°F are predicted.
The high temperature is forecasted to match October's standard maximum of 63.9°F.
Sunrise will be at 7:07 am and sunset at 6:11 pm; tomorrow's daylight will last for 11h and 3min.

10-day overview

Daily temperatures

Warmest day: Sunday 25.10. 79°C.
Coldest day: today 59°C.

Chance of precipitation

Highest chance: 5%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 59°F
  • 36°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 5mphNE 44°
  • Humidity: 46%
  • UV index: 4
  • Sunrise: 7:06 am CDT
  • Sunset: 6:12 pm CDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 66°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 9mphS 174°
  • Humidity: 46%
  • UV index: 4
  • Sunrise: 7:07 am CDT
  • Sunset: 6:11 pm CDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 72°F
  • 39°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphSSE 159°
  • Humidity: 48%
  • UV index: 4
  • Sunrise: 7:08 am CDT
  • Sunset: 6:09 pm CDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 73°F
  • 43°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphESE 105°
  • Humidity: 48%
  • UV index: 4
  • Sunrise: 7:10 am CDT
  • Sunset: 6:08 pm CDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 75°F
  • 43°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphS 176°
  • Humidity: 49%
  • UV index: 4
  • Sunrise: 7:11 am CDT
  • Sunset: 6:06 pm CDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 77°F
  • 45°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 5mphESE 117°
  • Humidity: 49%
  • UV index: 4
  • Sunrise: 7:12 am CDT
  • Sunset: 6:05 pm CDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 77°F
  • 45°F
Sunny
Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 7mphESE 106°
  • Humidity: 47%
  • UV index: 4
  • Sunrise: 7:13 am CDT
  • Sunset: 6:04 pm CDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 77°F
  • 46°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 7mphSE 135°
  • Humidity: 48%
  • UV index: 4
  • Sunrise: 7:14 am CDT
  • Sunset: 6:02 pm CDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 79°F
  • 48°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 7mphSSW 197°
  • Humidity: 48%
  • UV index: 4
  • Sunrise: 7:15 am CDT
  • Sunset: 6:01 pm CDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 77°F
  • 50°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 6mphSW 219°
  • Humidity: 53%
  • UV index: 4
  • Sunrise: 7:16 am CDT
  • Sunset: 6:00 pm CDT
  • ▼
In the days ahead, a combination of sunny and dull weather is expected.
Rainfall is not anticipated in Sullivan in the upcoming period.
Expect a substantial fluctuation in daytime highs throughout the forecast window. Maximum temperatures are forecasted between 59°F and 78.8°F, while there will be also a marked difference in overnight low temperatures, as nighttime lows are forecast to fall between 35.6°F and 50°F.
Expect the warmest day on next Sunday, with temperatures peaking at 78.8°F; today is the coldest day, with a maximum temperature of 59°F.
Updated: Oct 17, 2026 @ 17:15:43 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Saturday, sunshine is expected with little to no cloud cover.

Today, the maximum temperature will be 59°F, while the minimum temperature will be 35.6°F.
The highest temperature today will be a couple of degrees lower than the average maximum temperature in October. The lowest temperature will be significantly lower than the average low of 48.2°F.

On Saturday, in Sullivan, sunrise was at 7:06 am and sunset will be at 6:12 pm (CDT).

In Sullivan, today, there will be 11h and 6min of daylight.

Tomorrow, sunshine is forecasted under mostly clear skies.

Tomorrow, the maximum temperature will be 66.2°F, while the minimum temperature will be 37.4°F.
The highest temperature will be in line with the average maximum of 63.9°F in October. The lowest temperature tomorrow will be noticeably lower than the average low of 48.2°F.

On Sunday, in Sullivan, sunrise will be at 7:07 am and sunset at 6:11 pm (CDT).

In Sullivan, tomorrow, there will be 11h and 3min of daylight.