Indianapolis just broke a 13-year-old weather record. It’s not the heat.

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The phrase “It’s not the heat, it’s the humidity” may be on the minds of more than a few Hoosiers as dangerously high temperatures creep across central Indiana this week. Meteorologists with the National Weather Service in Indianapolis say the heat index on Thursday could reach 115 degrees.

As if that wasn’t bad enough, Indianapolis broke a dew point record that had not been seen in 13 years.

On Thursday, NWS Indianapolis posted the following on

Dangerous heat hits Indiana this week: What you should know about forecasts

“It’s not often in Indianapolis that we see these high dew points,” said Andrew White, a meteorologist with the National Weather Service. “In fact, it’s only happened three times since 2000. It’s hard to get that much humidity, especially in the Indianapolis area. We tend to be a little drier.”

What is dew point?

White explains that dew point is a measure of the amount of moisture present in the atmosphere, while humidity is a combination of dew point and temperature. Thursday’s record-breaking dew point is contributing to the high temperatures in central Indiana with heat indexes ranging from 105 to 115 degrees, White said.

While Thursday could be the hottest all summer, according to the NWS, relief is on the horizon.

“The warm temperatures and humid conditions will continue into tomorrow, but fortunately this weekend we expect things to start to cool down,” White said.

The NWS forecast calls for cooler temperatures next week in central Indiana

Thursday afternoon: Mostly sunny and hot, with a high near 96. Heat index values ​​reach 110. Southwest wind 10 to 13 mph, with gusts up to 18 mph. Thursday night: Mostly clear, with a low around 78. Southwest winds 10 to 13 mph, with gusts up to 18 mph.

Friday: Sunny and hot, high near 93. Heat index values ​​reach 106. North northwest wind 6 to 8 mph. Friday night: Scattered showers and thunderstorms after 2 a.m. Partly cloudy, with a low around 70. North wind around 7 mph. The probability of rain is 20%.

Saturday: Scattered showers and thunderstorms before 8 am. Mostly sunny, with a high near 83. North northeast wind 6 to 9 mph. The probability of rain is 10%. Saturday nightPartly cloudy, with a low around 65.

Sunday: Mostly sunny, with a high near 81. Sunday nightPartly cloudy, with a low around 63.

Monday: Mostly sunny, with a high near 83. Monday nightPartly cloudy, with a low around 62.

Tuesday: Sunny, with a high near 81. Tuesday night: Mostly clear, low around 57.

Wednesday: Sunny, with a high near 76.

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John Tufts covers breaking news and trending news for the Indianapolis Star. Send him a news tip at

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