Weather forecast for 10 daysOttawa, IL

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 57°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphSW 226°
  • Humidity: 44%
  • UV index: 4
  • Sunrise: 7:09 am CDT
  • Sunset: 6:11 pm CDT
  • ▼
On Saturday, in Ottawa, sunshine and minimal clouds are in the outlook.
The forecasted temperature range extends from a high of a mild 57.2°F to a low of a wintry 37.4°F.
Today's highest temperature will be slightly cooler than the average October maximum of 61.7°F.
Sunrise was at 7:09 am and sunset will be at 6:11 pm; the daylight will last for 11h and 2min.

Sunday Oct 18, 2026

  • 66°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 12mphSSW 199°
  • Humidity: 48%
  • UV index: 4
  • Sunrise: 7:10 am CDT
  • Sunset: 6:10 pm CDT
  • ▼
Tomorrow, expect bright skies and plenty of sunshine.
Temperatures are expected to move from a peak of a comfortable 66.2°F to a low of a wintry 37.4°F.
The forecasted temperature is a couple of degrees higher than October's regular maximum of 61.7°F.
Sunrise will be at 7:10 am and sunset at 6:10 pm; tomorrow's daylight will last for 10h and 59min.

10-day overview

Daily temperatures

Warmest period: Thursday - Sunday 75°C.
Coldest day: today 57°C.

Chance of precipitation

Highest chance: Monday 26.10. 9%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 57°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphSW 226°
  • Humidity: 44%
  • UV index: 4
  • Sunrise: 7:09 am CDT
  • Sunset: 6:11 pm CDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 66°F
  • 37°F
Sunny
Sunny
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 12mphSSW 199°
  • Humidity: 48%
  • UV index: 4
  • Sunrise: 7:10 am CDT
  • Sunset: 6:10 pm CDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 70°F
  • 39°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 3mphS 175°
  • Humidity: 53%
  • UV index: 4
  • Sunrise: 7:11 am CDT
  • Sunset: 6:08 pm CDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 72°F
  • 43°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphESE 118°
  • Humidity: 56%
  • UV index: 4
  • Sunrise: 7:13 am CDT
  • Sunset: 6:07 pm CDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 73°F
  • 43°F
Sunny
Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphS 183°
  • Humidity: 54%
  • UV index: 4
  • Sunrise: 7:14 am CDT
  • Sunset: 6:05 pm CDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 75°F
  • 45°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphSE 133°
  • Humidity: 56%
  • UV index: 4
  • Sunrise: 7:15 am CDT
  • Sunset: 6:04 pm CDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 75°F
  • 46°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 6mphESE 113°
  • Humidity: 57%
  • UV index: 4
  • Sunrise: 7:16 am CDT
  • Sunset: 6:02 pm CDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 75°F
  • 48°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 8mphSE 141°
  • Humidity: 54%
  • UV index: 4
  • Sunrise: 7:17 am CDT
  • Sunset: 6:01 pm CDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 75°F
  • 48°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 4%
  • Precipitation: 0"
  • Wind: 7mphSSW 206°
  • Humidity: 53%
  • UV index: 3
  • Sunrise: 7:18 am CDT
  • Sunset: 5:59 pm CDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 73°F
  • 48°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 9%
  • Precipitation: 0"
  • Wind: 6mphNE 51°
  • Humidity: 60%
  • UV index: 3
  • Sunrise: 7:20 am CDT
  • Sunset: 5:58 pm CDT
  • ▼
Weather patterns suggest that a combination of sunny and cloud-filled weather is expected.
Rainfall is not forecasted in Ottawa in the upcoming period.
Significant changes in temperature are expected over the next several days. Maximum temperatures are forecasted between 57.2°F and 75.2°F, while the low temperature range extends from 37.4°F to 48.2°F.
With a maximum temperature of 75.2°F, Thursday through next Sunday will be the warmest days; today is the coldest day, with a maximum temperature of 57.2°F.
Updated: Oct 17, 2026 @ 18:00:06 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Saturday, in Ottawa, expect sunny weather with a crisp, clear sky.

Today, the maximum temperature will be 57.2°F, while the minimum temperature will be 37.4°F.
Today, the highest temperature will be a couple of degrees lower than the average maximum temperature in October. The lowest temperature today will be also relatively lower than the average low temperature.

On Saturday, in Ottawa, sunrise was at 7:09 am and sunset will be at 6:11 pm (CDT).

In Ottawa, the length of the day today will be 11h and 2min.

On Sunday, expect sunny weather with a crisp, clear sky.

Tomorrow, the highest temperature will be 66.2°F, while the lowest temperature will be 37.4°F.
Tomorrow, the highest temperature will be relatively higher than the average maximum temperature in October. Tomorrow, the lowest temperature will be also moderately lower than the average low temperature.

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

In Ottawa, tomorrow, there will be 10h and 59min of daylight.