Indianapolis/ Weather & Environment

Indianapolis Sunday Warmth Gives Way to Storm Chances and Cooler Weather

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Published on September 20, 2026
Indianapolis Sunday Warmth Gives Way to Storm Chances and Cooler WeatherSource: Google Street View

Sunday brings warm weather to Indianapolis, with thunderstorms possible and a cooler, unsettled pattern waiting just behind the front.

Afternoon Storms Could Pack A Punch

The latest forecast calls for likely precipitation in northern parts of the area and a chance of precipitation in southern parts, with thunderstorms possible Sunday, according to the National Weather Service in Indianapolis. The weekend forecast includes thunderstorm chances Sunday.

Forecasters say an isolated severe storm could produce damaging winds. Thunderstorms are possible, so outdoor plans may need a backup option.

The front is expected to move south of the area. No watches, warnings or advisories are listed in the current forecast, but anyone caught outside during thunder should move indoors and wait for the storm to pass.

Monday Brings A Noticeable Cooldown

Monday will feel markedly different, with a high near 72, mostly cloudy skies and a 40% chance of rain showers.

Showers are possible Monday, with low precipitation chances Tuesday and possible low precipitation chances in eastern areas Wednesday. High pressure should bring dry weather to end the week, with temperatures returning near normal.

For Indianapolis, Sunday brings warmer weather before cooler September weather takes over.