What Was the Average Temperature in Summer 2025 in Southern IN

2025 Weather in Evansville Has Been a Rollercoaster

I have said it before, and I will say it again. 2025 has been a crazy year for weather and we are not done yet.

A Perfect September Day at Holiday World

This past weekend, my daughter, her friend, and I ventured to Holiday World & Splashin' Safari for our annual day at the theme park. We always wait until the very end of the Splashin' Safari season because crowds are smaller and the weather is usually more pleasant.

Yes, the water can be a little chilly, but you are not in it long enough for it to matter. We had a great time, and the temperature was in the mid-eighties, which was perfect. If we had gone in July or even early August, it would have been miserable. The water park would have been packed. In September, half the folks stay on the dry side, so we never waited more than 20 minutes for any of the water slides.

Doug Kelley via Unsplash

From Mild to Miserable: Summer Heat in Indiana and Kentucky

Looking back to June, I thought we were going to have a mild summer. Things were so tepid until mid-summer when temperatures soared into the upper 90s and heat indexes topped 100 degrees.

Then, just as quickly as the heat moved in, it left. A couple of weeks ago, temperatures shifted, and now we are seeing highs in the upper 70s. It looks like that heat wave is not coming back.

High Heat and High Utility Bills

The extreme heat was not just uncomfortable and dangerous. It also came with sky-high utility bills. New fees and increased usage costs hit the same month that soaring temperatures forced higher energy use.

Some Southern Indiana and Western Kentucky residents, even in tiny apartments and mobile homes, reported bills of $800 or more. It was a tough blow for many families already dealing with high prices.

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Photo by Tim Mossholder on Unsplash

National Weather Service Releases 2025 Summer Averages

Yesterday, the National Weather Service released the average temperatures for summer 2025. Though summer officially runs from June 20 through September 22, the agency reviewed data from June 1 through August 31.

Here is what they found:

Here is the Summer Climate Summary: https://www.weather.gov/pah/Summer2025ClimateSummary

Temperatures average a bit above normal, but the main story was the record high humidity levels. It was officially the most humid summer on record for Paducah, Cape Girardeau, and Carbondale (in terms of number of hours with dew points at or above 75 degrees). It started out very wet in June and into part of July, but then the pattern flipped and the end of July into August were exceptionally dry. This resulted in drought developing across much of the region by the end of August. The summer ended on a cool note, with record lows and very low humidity being experienced during the last week of August. A welcome change for sure!

The National Weather Service reported that the average summer temperature in Evansville was 79°F. The average high came in at 89°F, with the warmest high reaching 99°F and the coolest high at 79°F. The average low was 69°F, with the warmest low recorded at 78°F and the coolest dropping all the way to 50°F.

Average summer temperature in Evansville in 2025: 79°F
Average high temperature: 89°F
Warmest high: 99°F
Coolest high: 79°F
Average low temperature: 69°F
Warmest low: 78°F
Coolest low: 50°F

US National Weather Service Paducah Kentucky via Facebook

How This Year Compares to Normal

According to the National Weather Service, the average high temperature for summer in Evansville is normally 87.5°F, and the average low is 66.9°F. That means 2025 was only slightly hotter than normal.

So yes, we had some extreme swings, but overall, it was not as far off average as it may have felt when we were all sweating through those July heatwaves.

10 Weather Myths We've All Fallen For

Didd you know heat lightning isn’t actually a real thing? It’s just regular lightning from a thunderstorm that’s too far away for you to hear the thunder or see the strike hit the ground. I know, my whole life has been a lie too. But wait, there’s more! Keep scrolling for even more weather myths we’ve all fallen for.

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