Hillsboro, in Illinois, United States, is home to roughly 5,700 people in the Central Time Zone at 39.2°N latitude.
In 2025, Hillsboro averaged an annual temperature of 55°F, with hottest temperatures reaching 95°F in July and lowest around -3°F in January. The city received approximately 36 inches of precipitation during the year.
View historical weather for Hillsboro · More cities in Illinois