Colchester, in Illinois, United States, is home to roughly 1,300 people in the Central Time Zone at 40.4°N latitude.
In 2025, Colchester averaged an annual temperature of 54°F, with hottest temperatures reaching 96°F in June and lowest around -8°F in January. The city received approximately 33 inches of precipitation during the year.
View historical weather for Colchester · More cities in Illinois