Decatur is a city of approximately 9,500 people in Indiana, United States. Located in the America/Indiana/Indianapolis time zone at 40.8°N latitude.
In 2025, Decatur averaged an annual temperature of 52°F, with hottest temperatures reaching 92°F in June and lowest around -4°F in January. The city received approximately 33 inches of precipitation during the year.
View historical weather for Decatur · More cities in Indiana