Indianapolis, Indiana weather in January

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

Average high: 36°F
Average low: 22°F
Rainy days: ~10 per month
Total precipitation: 3.3 in
Warmest recorded: 64°F
Coldest recorded: -6°F

Expect January days in Indianapolis, Indiana to top out around 36°F and cool to about 22°F overnight, with roughly 10 days of measurable rain across the month. In recent years January has ranged from -6°F to 64°F.

Other months

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