Weather Forecast and Radar for Alton, Illinois

Weather in Alton, IL

Alton, Illinois is located within the Midwestern United States, and experiences a variety of weather patterns throughout the year. Summers in the area tend to be hot and humid, with temperatures typically reaching the mid-80s °F (30 °C) during the day, and dropping to the mid-60s °F (19 °C) at night. Spring and fall are milder, with temperatures ranging from the mid-50s to the mid-70s °F (13 to 24 °C). Winters in Alton tend to be cold, with temperatures often dipping into the 20s °F (-7 °C) during the night, and rarely rising above the mid-40s °F (7 °C) during the day. Precipitation is fairly consistent throughout the year, with the most rain typically occurring in the spring months.

Fast Facts About Alton, IL

As of 2020, the city population is 83705.

Major Cities Nearby Alton, IL

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