Indianapolis, Indiana Weather
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Climate of Indianapolis: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Indianapolis, with average daytime highs around 28°C. January is the coolest, when nights typically fall to about -7°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 36°C, so the seasons feel very different from each other.
The area receives about 1140 mm of rain in a typical year. Most of it falls from April to July, and June is the wettest month at roughly 134 mm.
For outdoor plans and travel, August to September usually offer the most comfortable weather in Indianapolis, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 1° | -7° | 75 mm | 87% |
| Feb | 3° | -6° | 68 mm | 85% |
| Mar | 10° | -1° | 88 mm | 81% |
| Apr | 17° | 5° | 111 mm | 78% |
| May | 22° | 11° | 119 mm | 79% |
| Jun | 27° | 17° | 134 mm | 79% |
| Jul | 28° | 18° | 112 mm | 78% |
| Aug | 28° | 17° | 95 mm | 75% |
| Sep | 25° | 13° | 81 mm | 72% |
| Oct | 18° | 6° | 93 mm | 74% |
| Nov | 10° | 0° | 82 mm | 80% |
| Dec | 4° | -4° | 83 mm | 86% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Indianapolis. Values describe typical conditions, not a forecast.
About Indianapolis weather
Indianapolis sits within Indiana's humid continental climate, typical of the US Midwest, in Indiana. Conditions turn hot with warm, humid summers (June–August). By December, expect cold winters (December–February) with regular snow. This page shows live, auto-refreshing weather for Indianapolis: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Indiana/Indianapolis.
Frequently asked questions
Indianapolis is in Indiana.
Indianapolis sees cold winters (December–February) with regular snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Indianapolis's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Indianapolis, with average daytime highs of about 28°C and nights around 18°C.
The coldest nights come in January, when the average low is about -7°C and daytime highs reach around 1°C. Frost is possible on clear, calm nights.
Indianapolis receives about 1140 mm of rain in a typical year. June is the wettest month at roughly 134 mm, and the main rainy period is April to July.
August to September usually offer the most comfortable weather in Indianapolis, with mild daytime temperatures and little rain.
In November Indianapolis typically sees daytime highs near 10°C and lows near 0°C, with about 82 mm of rain over the month and average humidity around 80%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Indianapolis is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Indianapolis's day-to-day weather follows the broader pattern of Indiana described above. See the hourly weather forecast or the air quality index for more detail.