Best time to visit Indianapolis
The best months to visit Indianapolis are September, May and August, based on month-by-month temperature and rainfall data. The full year of weather, daylight, holidays, and festival timing is below.
September, May and August score best for Indianapolis weather:
- May23° / 13°CRace month — the city runs on the Indy 500 and the weather mostly cooperates.
- August28° / 19°CHigh summer holds; state-fair season.
- September25° / 14°CThe driest, most reliable month — ideal for the Cultural Trail.
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By TripSapien Research · Updated May 20, 2026
Indianapolis weather by month
| Month | High | Low | Rain (mm) | Rainy days | Daylight |
|---|---|---|---|---|---|
| January | 2° | -5° | 82 | 14 | 10h |
| February | 5° | -4° | 71 | 12 | 10h |
| March | 11° | 1° | 101 | 15 | 11h |
| April | 18° | 7° | 118 | 16 | 13h |
| MayBest weather | 23° | 13° | 124 | 18 | 14h |
| June | 27° | 18° | 107 | 17 | 15h |
| July | 29° | 20° | 90 | 16 | 15h |
| AugustBest weather | 28° | 19° | 73 | 15 | 14h |
| SeptemberBest weather | 25° | 14° | 70 | 11 | 13h |
| October | 18° | 8° | 83 | 13 | 12h |
| November | 11° | 2° | 78 | 12 | 11h |
| December | 5° | -2° | 81 | 14 | 10h |
Temperatures in °C. Long-term monthly averages.
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Indianapolis month by month
January
Indianapolis in January: 2.4°C high, -5.5°C low, 81.5mm rain over 14 days, 9.7h daylight. Cold and wet — bundle up, museum and pool weather.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
February
Indianapolis in February: 4.7°C high, -3.8°C low, 71.3mm rain over 12 days, 10.2h daylight. Cold and clearer — short daylight but skies open.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
March
Indianapolis in March: 10.8°C high, 1.1°C low, 100.5mm rain over 15 days, 11.3h daylight. Mild but rainy — flexible plans pay off.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
April
Indianapolis in April: 17.5°C high, 6.8°C low, 117.5mm rain over 16 days, 12.7h daylight. Mild but rainy — flexible plans pay off.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
MayBest weather
Indianapolis in May: 22.7°C high, 12.9°C low, 124mm rain over 18 days, 13.9h daylight. Mild but rainy — flexible plans pay off.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
June
Indianapolis in June: 27.4°C high, 18.1°C low, 107.2mm rain over 17 days, 14.8h daylight. Mild but rainy — flexible plans pay off.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily) · Indiana Black Expo Summer Celebration · Indiana State Fair
July
Indianapolis in July: 29°C high, 19.7°C low, 89.9mm rain over 16 days, 14.9h daylight. Hot and rainy — afternoon storms, plan indoor afternoons.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily) · Indiana Black Expo Summer Celebration · Indiana State Fair
AugustBest weather
Indianapolis in August: 28.4°C high, 18.7°C low, 73.3mm rain over 15 days, 14.2h daylight. Hot and rainy — afternoon storms, plan indoor afternoons.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily) · Indiana Black Expo Summer Celebration · Indiana State Fair
SeptemberBest weather
Indianapolis in September: 25.3°C high, 14.4°C low, 70.1mm rain over 11 days, 13h daylight. Mild and dry — shoulder-season sweet spot.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily) · Indy Jazz Fest (September 12-17th)
October
Indianapolis in October: 18.4°C high, 8.2°C low, 82.9mm rain over 13 days, 11.8h daylight. Mild but rainy — flexible plans pay off.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
November
Indianapolis in November: 11°C high, 2.1°C low, 77.7mm rain over 12 days, 10.5h daylight. Mild and dry — shoulder-season sweet spot.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
December
Indianapolis in December: 4.9°C high, -2.4°C low, 80.7mm rain over 14 days, 9.6h daylight. Cold and wet — bundle up, museum and pool weather.
Indianapolis Motor Speedway Museum (Mar–Oct: 9AM–5PM daily; Nov–Feb: 10AM–4PM daily)
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