Indianapolis/ Weather & Environment

Indianapolis Flood Watch And Storm Forecast For Wednesday

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Published on August 19, 2026
Indianapolis Flood Watch And Storm Forecast For WednesdaySource: Google Street View

Indianapolis is waking up to mostly cloudy skies and temperatures near 70 degrees Wednesday, but the quiet start is not expected to last. Showers and thunderstorms may begin developing around late morning, with the storm threat increasing through the afternoon and evening. A Flood Watch is in effect for Marion County as forecasters warn that repeated downpours could quickly overwhelm already-saturated ground.

Storms Arrive Around Midday

The temperature should climb only to about 78 degrees, with a 50% chance of rain and thunderstorms Wednesday. The best chance for storms comes from noon through the evening, when a few cells could bring heavy rain, gusty winds or hail.

The National Weather Service says the Flood Watch runs from 2 p.m. Wednesday through Thursday morning. Central Indiana could see 1 to 3 inches of rain through tonight, with locally higher totals possible if thunderstorms repeatedly track over the same areas.

Flooding Risk Builds Into Tonight

Showers and thunderstorms are likely between 7 p.m. and midnight, followed by additional showers and patchy fog overnight. Low temperatures should settle near 66 degrees, while another three-quarters to 1 inch of rain could fall in some locations.

Residents should avoid driving through water-covered roads and keep an eye on low-lying areas, creeks and drainage trouble spots. The updated flood threat is a more immediate turn from Hoodline's earlier Indy storm outlook, which focused on a different late-week system.

Quieter Weather Returns Thursday

Thursday should bring patchy morning fog followed by mostly sunny skies and a high near 80 degrees. Friday looks even calmer and sunnier, with a high near 81, before a 30% chance of afternoon storms returns Saturday.

By Sunday, Indianapolis should dry out again under mostly sunny skies, with a cooler high near 77 degrees. The early-week outlook remains generally quiet, with mostly sunny conditions and highs in the upper 70s to low 80s.