Indianapolis, IN Weather Forecast & Climate Guide
Indianapolis has a humid continental climate with four distinct seasons and variable weather.
Climate type: Humid continental (Köppen Dfa)
Indianapolis Climate Overview
Hot, humid summers. Cold winters with moderate snow. Spring and fall are pleasant but changeable.
Severe thunderstorms and occasional tornadoes in spring. Winter ice storms can occur.
Indianapolis Weather by Season
spring
Spring is unpredictable — late snow in March is possible, but April and May warm quickly into the 60s-70s°F. Severe thunderstorms are a regular feature.
summer
Summers are hot and humid with highs in the mid-80s°F. The Indy 500 in late May marks the unofficial start of summer. Afternoon thunderstorms are frequent.
fall
Fall is Indianapolis's best weather season — mild, dry, sunny, and with pleasant foliage. October highs in the 60s°F make for ideal outdoor weather.
winter
Winters are cold and variable with highs in the upper 30s°F and lows in the 20s°F. Ice storms are a bigger hazard than pure snowstorms.
Indianapolis Average Monthly Temperatures
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 36° | 41° | 52° | 64° | 74° | 83° | 86° | 84° | 78° | 66° | 52° | 39° |
| Low °F | 20° | 23° | 32° | 42° | 52° | 62° | 66° | 64° | 56° | 44° | 34° | 24° |
Best Time to Visit Indianapolis
Late April through May and mid-September through October. Both offer mild temperatures, low humidity, and minimal storm risk. May brings the Indy 500 and its festivities.
Severe Weather Risks
- Severe thunderstorms
- Tornadoes
- Ice storms
- Blizzards
- Flash flooding
Weather Facts About Indianapolis
- >Indianapolis sits in Tornado Alley's eastern edge and sees multiple severe weather outbreaks each spring.
- >The city's geographic center of Indiana means extreme temperature swings as fronts pass through.
- >The 2002 "Super Bowl Tornado Outbreak" tracked through central Indiana, causing major damage.
Indianapolis Weather FAQ
When is the best time to visit Indianapolis?
May for the Indy 500 and spring weather, or September-October for mild, sunny days with fall color. Both windows deliver comfortable temperatures and minimal storm risk.
Does Indianapolis get tornadoes?
Yes. Central Indiana sees multiple tornado warnings each spring (March-June) and occasionally in fall. The 2002 and 2023 outbreaks both caused major damage in the metro area.
How cold does Indianapolis get?
Average winter highs are in the upper 30s°F with lows in the 20s°F. Arctic outbreaks can push temperatures below zero. The city averages 22 inches of snow per year.
Is Indianapolis humid in summer?
Yes. July and August dewpoints average in the upper 60s°F, making heat index values climb into the 90s°F regularly. Afternoon thunderstorms are common.