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13 WTHR Indianapolis | Indianapolis Local News & Weather

Hottest air of the year so far likely Saturday

Highs nearing 90° and heat indices near 100° to open the weekend.

All signs continue to point toward a hot weekend in central Indiana, but there will be a significant difference in how each day feels.

Our stretch run of rather humid air continues on Friday, which marks the sixth straight of locally heavy rain in central Indiana. But there will be much more sunshine for a majority of the viewing area that results in hotter highs in the mid-to-upper 80s with heat indices in the 80s Friday afternoon.

But the miserably muggy stretch of days peaks on Saturday with the hottest air of the year so far. We continue to forecast highs near/above 90° and peak heat indices near 100° Saturday afternoon.

Credit: WTHR

This combination of high heat and humid air makes the atmosphere moderately unstable, resulting in scattered to possibly numerous heavy storm clusters late in the afternoon into Saturday evening. Due to the much higher instability, these storms would certainly be stronger than what we've encountered and conceivable they could producer locally severe wind and/or hail.

With or without becoming severe, they would pose lightning and heavy rain threat if you're out boating, swimming, or on the soccer field or ball diamond. It will be a good idea to monitor Live Doppler 13 Radar Saturday afternoon for local impacts.

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Less humid air arrives Saturday night into Sunday. While Sunday will "feel" better in terms in the Muggy Meter, it will be equally as hot with the dry air and sunshine easily producing highs in the upper 80s.

A secondary cold front sweeps the state Monday and ushers-in comfortable weather for the middle of next week. In fact, lows may be cool to open windows and turn off air conditioners.

Credit: WTHR

We'll get a brief shot of late-day storms Monday, and then it's smooth sailing much of next week as much drier air spreads out over the Ohio Valley. This paves the way for comfortable nights and mild afternoons with abundant sunshine