Weather Forecast and Radar for Jacksonville, Illinois

Routes Running Nearby to Jacksonville, Illinois

• I-72 runs east-west through Jacksonville, IL.

• The I-55 runs north-south east of Jacksonville, IL, through Springfield, IL.

Weather in Jacksonville, IL

In Jacksonville, the summers are long, warm, and humid; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 22°F to 86°F and is rarely below 3°F or above 93°F.

The hot season lasts for 4.0 months, from May 21 to September 23, with an average daily high temperature above 76°F. The hottest month of the year in Jacksonville is July, with an average high of 86°F and low of 67°F.

The cold season lasts for 3.0 months, from November 30 to February 28, with an average daily high temperature below 46°F. The coldest month of the year in Jacksonville is January, with an average low of 22°F and high of 37°F.

A total of 75 historical tornado events that had recorded magnitude of 2 or above found in or near Jacksonville, IL.

Fast Facts About Jacksonville, IL

The city was incorporated in 1825.

As of 2020, the city population is 17,616.

Major Cities Nearby Jacksonville, IL

• Chicago, Illinois (roughly 184 miles to the northeast)

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