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Best time to visit · Indiana, United States
September & October are the best time to visit Indianapolis on the climate data: September scores 89/100, with highs around 78°F (26°C) and 3.2 in (81 mm) of rain. April – June and August are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
These averages also cover Downtown Indianapolis.
Highs run from 35°F to 84°F across the year, and the yearly total is about 44.9 in (1141 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 35°F1°C | 38°F3°C | 50°F10°C | 63°F17°C | 73°F23°C | 81°F27°C | 84°F29°C | 83°F29°C | 78°F26°C | 65°F18°C | 51°F11°C | 39°F4°C |
| Avg low | 19°F-7°C | 21°F-6°C | 31°F-1°C | 42°F5°C | 53°F12°C | 62°F17°C | 65°F19°C | 64°F18°C | 56°F13°C | 44°F7°C | 33°F0°C | 24°F-4°C |
| Rain/snow | 3.0 in75 mm | 2.7 in68 mm | 3.5 in88 mm | 4.4 in111 mm | 4.7 in119 mm | 5.3 in134 mm | 4.4 in112 mm | 3.7 in95 mm | 3.2 in81 mm | 3.7 in93 mm | 3.2 in82 mm | 3.3 in83 mm |
| Humidity | 87% | 85% | 81% | 78% | 79% | 79% | 78% | 75% | 72% | 74% | 80% | 86% |
| Cloud | 71% | 70% | 66% | 61% | 62% | 53% | 50% | 48% | 45% | 55% | 60% | 72% |
| Comfort | 42 | 43 | 58 | 79 | 80 | 74 | 72 | 78 | 89 | 85 | 63 | 41 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 259 m (850 ft), close to Indianapolis's own ~220 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The cold peaks here: highs of 35–39°F (1–4°C), and nights reach 19°F (-7°C). It's the driest season, with only about 8.9 in (226 mm) of rain or snow, 20% of the year's total. December – February are cold enough for snow. It holds the toughest stretch on our comfort score (December – February), averaging 42/100.
Temperatures climb through the season, from 50°F highs in March to 73°F by May. About 12.5 in (318 mm) of rain falls across these months, 28% of the year's total. Nights dip below freezing in March. April & May score well without being the very best (season average 72/100).
The warmest stretch of the year, with highs of 81–84°F (27–29°C). It's the wettest season, with about 13.4 in (341 mm) of rain, 30% of the year's total. June – August feel humid, with humidity near 79%. June and August score well without being the very best (season average 75/100).
Temperatures slide from 78°F highs in September to 51°F by November. About 10.1 in (256 mm) of rain falls across these months, 22% of the year's total. Lows bottom out around 33°F (0°C). September & October are among the best-scoring months (season average 79/100).
By comfort score: 5 Great, 3 Good, 1 Fair and 3 Tough. Great months: April & May and August – October. Tap a month for its own guide.
September & October are the best time to visit Indianapolis on the climate data: September scores 89/100, with highs around 78°F (26°C) and 3.2 in (81 mm) of rain. April – June and August are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
June is the wettest month, averaging about 5.3 in (134 mm) of rain. February is the driest, with about 2.7 in (68 mm). The yearly total is around 44.9 in (1141 mm).
January is the coldest, with average lows of 19°F (-7°C) and highs of 35°F (1°C). The warmest is July, with average highs of 84°F (29°C).
Yes: in June – August humidity averages 79% with warm temperatures, so it feels muggy. Summer highs peak around 84°F (29°C).
On average, yes: lows fall below 32°F (0°C) in December – March, bottoming out around 19°F (-7°C) in January.
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