Harrisburg, in Illinois, United States, is home to roughly 8,900 people in the Central Time Zone at 37.7°N latitude.
Recent weather here gives a sense of typical conditions: in 2025, Harrisburg recorded a mean annual temperature of 58°F, ranging from 3°F lows in February to 93°F highs in July, with about 47 inches of precipitation across the year.
View historical weather for Harrisburg · More cities in Illinois