Indianapolis Weather December 2025. The average values for day and night temperatures during december were 42.7 °f и 37.3. Weather.com brings you the most accurate monthly weather forecast for indianapolis, in with average/record and high/low temperatures, precipitation and more.
April and may will be warmer than normal, with rainfall above. Precipitation and snowfall will be below normal, with the most snow in late december, from late january into early february, and from late february into early march.