Central Indiana heat index nears 100° as air quality drops; storms return Friday | July 15, 2026

Marcus’ 4 a.m. Wednesday forecast

INDIANAPOLIS (WISH) — Central Indiana faces a combination of triple-digit heat indices and declining air quality Wednesday as a stagnant weather pattern lingers over the region.


Heat and Air Quality Concerns

A strong ridge of high pressure will maintain hot and humid conditions through Thursday, with afternoon highs reaching the low to mid-90s. When combined with humidity, heat index values are expected to climb between 100 and 105 degrees during peak afternoon hours.

Stagnant air trapped near the surface is causing ozone levels to rise, leading to poor air quality in parts of Indiana. People with respiratory issues are advised to limit prolonged outdoor activity today.


Storm Chances Return Friday

The oppressive heat will begin to ease late in the workweek as a disturbance moves into the region Friday, bringing an increased chance of showers and thunderstorms.

A northwest wind pattern will then guide another storm system into Indiana on Saturday, keeping rain chances elevated through the weekend.


Relief Early Next Week

Following a brief dry spell, a more potent weather system is expected early next week, likely bringing cooler temperatures behind it.


7 Day Forecast:

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