Weather forecast for 10 daysWilliamson, IL
Weather forecast for the weekend
Sunday Oct 18, 2026
- 66°F
- 37°F
Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 9mphSSE 168°
- Humidity: 48%
- UV index: 5
- Sunrise: 7:11 am CDT
- Sunset: 6:16 pm CDT
- details ▼
Tomorrow, on Sunday, sun-filled conditions are expected to persist.
Day and night temperatures will contrast sharply, from a maximum of an enjoyable 66.2°F to a minimum of an icy 37.4°F.
Tomorrow's high temperature will mirror the usual October maximum of 65.3°F.
Sunrise will be at 7:11 am and sunset at 6:16 pm; tomorrow's daylight will last for 11h and 5min.
Day and night temperatures will contrast sharply, from a maximum of an enjoyable 66.2°F to a minimum of an icy 37.4°F.
Tomorrow's high temperature will mirror the usual October maximum of 65.3°F.
Sunrise will be at 7:11 am and sunset at 6:16 pm; tomorrow's daylight will last for 11h and 5min.
10-day overview
Daily temperatures
Warmest day: Sunday 25.10. 81°C.
Coldest day: tomorrow 66°C.
Coldest day: tomorrow 66°C.
Chance of precipitation
Highest chance: Monday - Monday 5%.
Long-term weather forecast
- Saturday
- Oct 17, 2026
- min.
- 36°F
Clear
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 3mphSE 134°
- Humidity: 80%
- UV index: 0
- Sunrise: 7:10 am CDT
- Sunset: 6:17 pm CDT
- details ▼
- Sunday
- Oct 18, 2026
- 66°F
- 37°F
Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 9mphSSE 168°
- Humidity: 48%
- UV index: 5
- Sunrise: 7:11 am CDT
- Sunset: 6:16 pm CDT
- details ▼
- Monday
- Oct 19, 2026
- 72°F
- 41°F
Mostly Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 4mphSSE 165°
- Humidity: 49%
- UV index: 4
- Sunrise: 7:12 am CDT
- Sunset: 6:15 pm CDT
- details ▼
- Tuesday
- Oct 20, 2026
- 73°F
- 43°F
Mostly Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 4mphESE 111°
- Humidity: 47%
- UV index: 4
- Sunrise: 7:13 am CDT
- Sunset: 6:13 pm CDT
- details ▼
- Wednesday
- Oct 21, 2026
- 77°F
- 43°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 3mphS 185°
- Humidity: 46%
- UV index: 4
- Sunrise: 7:14 am CDT
- Sunset: 6:12 pm CDT
- details ▼
- Thursday
- Oct 22, 2026
- 77°F
- 45°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 4mphSE 131°
- Humidity: 47%
- UV index: 4
- Sunrise: 7:15 am CDT
- Sunset: 6:10 pm CDT
- details ▼
- Friday
- Oct 23, 2026
- 77°F
- 48°F
Mostly Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 7mphSE 128°
- Humidity: 47%
- UV index: 4
- Sunrise: 7:17 am CDT
- Sunset: 6:09 pm CDT
- details ▼
- Saturday
- Oct 24, 2026
- 79°F
- 48°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 7mphSSE 150°
- Humidity: 45%
- UV index: 4
- Sunrise: 7:18 am CDT
- Sunset: 6:08 pm CDT
- details ▼
- Sunday
- Oct 25, 2026
- 81°F
- 50°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 6mphSSW 198°
- Humidity: 45%
- UV index: 4
- Sunrise: 7:19 am CDT
- Sunset: 6:07 pm CDT
- details ▼
- Monday
- Oct 26, 2026
- 77°F
- 48°F
Partly Cloudy
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 6mphS 182°
- Humidity: 47%
- UV index: 4
- Sunrise: 7:20 am CDT
- Sunset: 6:05 pm CDT
- details ▼
Forecasts for the ten-day outlook show that a combination of bright and dull weather is anticipated.
Rain is not expected in Williamson in the upcoming period.
Noticeable swings in temperature are expected in the coming days. The temperature is expected to swing from 66.2°F up to 80.6°F, while the variation in nighttime lows will be also notably wide, as the overnight lows will vary from 35.6°F to 50°F.
Expect the warmest day on next Sunday, with temperatures peaking at 80.6°F; the lowest daytime temperature of the period will be reached on Sunday, peaking at 66.2°F.
Rain is not expected in Williamson in the upcoming period.
Noticeable swings in temperature are expected in the coming days. The temperature is expected to swing from 66.2°F up to 80.6°F, while the variation in nighttime lows will be also notably wide, as the overnight lows will vary from 35.6°F to 50°F.
Expect the warmest day on next Sunday, with temperatures peaking at 80.6°F; the lowest daytime temperature of the period will be reached on Sunday, peaking at 66.2°F.
Updated: Oct 18, 2026 @ 01:53:10 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 Williamson, the weather remains calm, bright, and sunny.
Tomorrow, the highest temperature in Williamson will be 66.2°F, while the lowest temperature will be 37.4°F.
The highest temperature tomorrow will be in line with the average maximum temperature in October. The lowest temperature will be noticeably lower than the average low of 48.4°F.
The highest temperature tomorrow will be in line with the average maximum temperature in October. The lowest temperature will be noticeably lower than the average low of 48.4°F.
On Sunday, in Williamson, sunrise will be at 7:11 am and sunset at 6:16 pm (CDT).
In Williamson, Illinois, the length of the day tomorrow will be 11h and 5min.
