Indianapolis, IN Weather
Indianapolis hourly forecast: next 24 hours
Today's high of 84°F (29°C) is right in line with the typical August high of 83°F (28°C).
Current conditions in detail
Indianapolis weather tomorrow (Friday, August 14)
Tomorrow in Indianapolis looks light rain shower, with a high of 83° and an overnight low of 70°. There is a 88% chance of rain - plan accordingly. Winds top out near 7 mph, and the UV index reaches 6 (high).
Indianapolis 14-day forecast
About the weather in Indianapolis
Indianapolis has a humid subtropical climate, marked by hot, humid summers and generally mild winters. Average daytime highs range from about 38°F (3°C) in January to around 85°F (29°C) in July, and the city records roughly 130 days of measurable precipitation a year.
Indianapolis weather: quick facts
- Hottest month: July - highs near 85°F (29°C)
- Coldest month: January - highs near 38°F (3°C)
- Record high: 95°F (35°C) · Record low: -18°F (-28°C) (2015–2024)
- Wettest month: March (13 rainy days) · Sunniest: July (11.7 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
- Snow: about 10 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 85°F (29°C) and overnight lows stay near 67°F (20°C). The coolest month is January, with typical highs of 38°F (3°C) and lows around 23°F (-5°C). Based on 2015–2024 weather data, temperatures have reached as high as 95°F (35°C) and dropped as low as -18°F (-28°C).
Rain, sun and snow
March is usually the wettest month. It brings about 5.3 inches (135 mm) of rain over 13 days, while September is the driest. July brings the most sunshine, averaging 11.7 hours of sun a day. Snow falls on about 10 days in a typical year, mostly from November through April.
Season by season
Spring (March through May)
Spring in Indianapolis is mild, with daytime highs averaging 63°F (17°C) and nights around 44°F (7°C); expect showers on roughly 39 days across the season.
Summer (June through August)
Summer in Indianapolis runs hot, with daytime highs averaging 83°F (29°C) and nights around 66°F (19°C); expect showers on roughly 36 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
Fall (September through November)
Fall in Indianapolis stays on the cool side of mild, with daytime highs averaging 66°F (19°C) and nights around 49°F (9°C); expect showers on roughly 26 days across the season.
Winter (December through February)
Winter in Indianapolis is chilly, with daytime highs averaging 41°F (5°C) and nights around 26°F (-4°C); expect showers on roughly 29 days across the season, plus around 8 snowy days.
Average temperatures in Indianapolis by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 38° | 23° | 10 | 3.4 in | 5.1 h/day | 72% |
| February | 43° | 25° | 9 | 3.2 in | 6.6 h/day | 69% |
| March | 52° | 34° | 13 | 5.3 in | 7.4 h/day | 68% |
| April | 62° | 43° | 12 | 4.1 in | 8.7 h/day | 66% |
| May | 73° | 55° | 14 | 4.9 in | 9.9 h/day | 70% |
| June | 82° | 64° | 12 | 4.0 in | 11.6 h/day | 67% |
| July | 85° | 67° | 13 | 4.6 in | 11.7 h/day | 73% |
| August | 83° | 66° | 11 | 3.5 in | 11.3 h/day | 72% |
| September | 79° | 61° | 7 | 2.9 in | 10.0 h/day | 69% |
| October | 66° | 49° | 10 | 3.1 in | 8.0 h/day | 69% |
| November | 52° | 36° | 9 | 3.2 in | 6.4 h/day | 71% |
| December | 44° | 29° | 9 | 3.5 in | 5.1 h/day | 74% |