Weather Forecast and Radar for Ottawa, Illinois

Weather in Ottawa, IL

The climate in Ottawa, Illinois is seasonal with generally mild summers and cold winters.

In the summer months, temperatures usually range from the low 70s (Fahrenheit) to the low 90s. During the spring, temperatures range from the mid-40s to the mid-70s.

In the fall, temperatures range from the mid-40s in the morning to the mid-70s during the day. In the winter months, temperatures can range from the single digits to the mid-40s.

Ottawa receives about 35 inches of precipitation annually, with most of it falling during the spring and summer months. Snowfall averages around 24 inches per year.

The city experiences frequent thunderstorms during the summer months, and occasionally during the winter months.

Overall, Ottawa has a temperate climate with four distinct seasons.

Fast Facts About Ottawa, IL

As of 2020, the city population is 18742.

Major Cities Nearby Ottawa, IL

This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Ottawa, Illinois.