Indianapolis/ Weather & Environment

Indy Sizzles: 91 Degrees, Muggy Air and Pop-Up Storms on Tap

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Published on September 16, 2026
Indy Sizzles: 91 Degrees, Muggy Air and Pop-Up Storms on TapSource: tpsdave / Wikimedia Commons

Indianapolis is waking Wednesday to convection and clouds affecting the area near sunrise, with muggy air. The city is headed for a hot 91-degree afternoon, and the heat index could reach 102. Showers and thunderstorms remain possible before noon, but the odds drop to a slight chance later in the day.

According to the National Weather Service Indianapolis, the chance of rain is 40% Wednesday, with locally heavy rain possible. Winds should remain variable, although any storm could briefly bring gusty winds or a locally heavy downpour.

Thursday Stays Hot Before A Brief Friday Break

Thursday will feature clouds and convection, with a high near 90 and another heat index around 100. A slight chance of showers and thunderstorms will linger, then Friday brings a brief reprieve from the heat with low precipitation probabilities and a cooler high near 84.

Friday night follows the brief Friday break, with Saturday next bringing more warmth and storm chances in the afternoon.

Storm Chances Build Into Sunday

The most unsettled stretch arrives Saturday night into Sunday. Rain and thunderstorms are expected to become more likely overnight Saturday, followed by likely showers Sunday and a high near 86.

Rain chances persist into next week before Tuesday turns cooler near 80. No watches, warnings or advisories are currently listed for Indianapolis, but the combination of heat and humidity Wednesday means outdoor plans will be more comfortable earlier or later in the day.