Indianapolis, Indiana weather in December

Averages from 2021–2025 (155 days of record).

Average high: 44°F
Average low: 29°F
Rainy days: ~10 per month
Total precipitation: 3.6 in
Warmest recorded: 66°F
Coldest recorded: -11°F

Expect December days in Indianapolis, Indiana to top out around 44°F and cool to about 29°F overnight, with roughly 10 days of measurable rain across the month. In recent years December has ranged from -11°F to 66°F.

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Current Indianapolis, Indiana forecast → · Historical data by Open-Meteo (ERA5).