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 recorded an average annual temperature of 55°F. The hottest temperatures reached 95°F in July; the coolest were -3°F in January. Total precipitation for the year was 36 inches, with the wettest month being April. Snowfall for the year totaled approximately 7 inches.
View current conditions and forecast for Hillsboro · More cities in Illinois