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Indianapolis Weather by Month
Average temperatures, rainfall and humidity for Indianapolis, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Indianapolis month looks like before you travel — then check the live Indianapolis forecast for the days ahead.
Warmest month
July
29°C average high
Coolest month
January
-5°C average low
Wettest month
April
81 mm of rain
Driest month
February
42 mm of rain
Average temperature and rainfall in Indianapolis by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 3°C | -5°C | -25°C / 19°C | 44 mm | 78% | 16 km/h |
| February | 6°C | -4°C | -28°C / 24°C | 42 mm | 75% | 16 km/h |
| March | 12°C | 2°C | -22°C / 30°C | 74 mm | 69% | 17 km/h |
| April | 18°C | 7°C | -5°C / 29°C | 81 mm | 67% | 17 km/h |
| May | 24°C | 13°C | -2°C / 35°C | 76 mm | 69% | 14 km/h |
| June | 28°C | 18°C | 6°C / 37°C | 80 mm | 70% | 12 km/h |
| July | 29°C | 19°C | 10°C / 39°C | 61 mm | 74% | 11 km/h |
| August | 28°C | 18°C | 9°C / 36°C | 65 mm | 74% | 11 km/h |
| September | 26°C | 15°C | 4°C / 36°C | 56 mm | 73% | 11 km/h |
| October | 19°C | 9°C | -4°C / 32°C | 74 mm | 73% | 14 km/h |
| November | 11°C | 2°C | -15°C / 26°C | 43 mm | 73% | 15 km/h |
| December | 6°C | -1°C | -23°C / 21°C | 57 mm | 79% | 15 km/h |
Best time to visit Indianapolis
The most comfortable time to visit Indianapolis is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around April, totalling about 753 mm a year.
Travellers who prefer heat should aim for July, when highs average 29°C. April is the month to avoid if rain would spoil your plans — it averages 81 mm, roughly 2× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Indianapolis forecast for what is happening now.