Indianapolis Climate by Month
Indianapolis, Indiana, United States
Hot summers and cold winters, with rain spread through the year.
The climate in Indianapolis is one of hot summers and cold winters, with rain spread through the year. Expect highs of 87°F (30°C) in July and 36°F (2°C) in January, with the coldest nights (January) near 20°F (-6°C). It gets 41 in (1049 mm) of rain a year, spread across the months.
- Warmest month
- 87°F(30°C)
- Average high, July
- Coldest nights
- 20°F(-6°C)
- Average low, January
- Rain per year
- 41 in(1049 mm)
- No clear rainy season
- Humidity
- 73%
- Sunniest: July
Best and worst months in Indianapolis
Best for weatherThe most comfortable weather comes in May and September, with highs around 78°F (25°C) and about 3.8 in (96 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 36°F (2°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Indianapolis weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 36°F(2°C) | 20°F(-6°C) | 2.8 in(71 mm) | 95% | 1.6 |
| FebFebruary | 41°F(5°C) | 23°F(-5°C) | 2.5 in(63 mm) | 81% | 2.6 |
| MarMarch | 52°F(11°C) | 33°F(0°C) | 3.4 in(86 mm) | 76% | 3.7 |
| AprApril | 65°F(18°C) | 43°F(6°C) | 4.2 in(106 mm) | 64% | 4.5 |
| MayMayBest | 75°F(24°C) | 54°F(12°C) | 4.6 in(116 mm) | 68% | 5.2 |
| JunJune | 83°F(29°C) | 63°F(17°C) | 4.1 in(104 mm) | 68% | 5.7 |
| JulJuly | 87°F(30°C) | 66°F(19°C) | 4.2 in(107 mm) | 68% | 5.9 |
| AugAugust | 86°F(30°C) | 64°F(18°C) | 3.1 in(80 mm) | 71% | 5.4 |
| SepSeptemberBest | 80°F(27°C) | 56°F(13°C) | 3.0 in(76 mm) | 64% | 4.4 |
| OctOctober | 68°F(20°C) | 45°F(7°C) | 2.9 in(74 mm) | 65% | 3.1 |
| NovNovember | 53°F(12°C) | 34°F(1°C) | 3.4 in(87 mm) | 73% | 1.9 |
| DecDecember | 41°F(5°C) | 25°F(-4°C) | 3.1 in(79 mm) | 79% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
All 20 places like Indianapolis →- 🇺🇸ChampaignIllinois, United States · Pop. 86k99%matchSame summer highsSame winter lowsIndianapolis vs Champaign →
- 🇺🇸Terre HauteIndiana, United States · Pop. 61k99%matchSame winter lowsSame summer highsIndianapolis vs Terre Haute →
- 🇺🇸DanvilleIllinois, United States · Pop. 32k99%matchSame summer highsSame winter lowsIndianapolis vs Danville →
- 🇺🇸LafayetteIndiana, United States · Pop. 71k99%matchSame summer highsSame winter lowsIndianapolis vs Lafayette →
- 🇺🇸HamiltonOhio, United States · Pop. 62k98%matchSame summer highsSame winter lowsIndianapolis vs Hamilton →