Indianapolis, Indiana weather in May

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

Average high: 73°F
Average low: 54°F
Rainy days: ~13 per month
Total precipitation: 4.1 in
Warmest recorded: 87°F
Coldest recorded: 33°F

Expect May days in Indianapolis, Indiana to top out around 73°F and cool to about 54°F overnight, with roughly 13 days of measurable rain across the month. In recent years May has ranged from 33°F to 87°F.

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