Weather in Kentucky is turning increasingly oppressive this week, as a massive heat dome tightens its grip on the Midwest. In Louisville, heat index values are soaring to 105°F (40.5°C) or higher, making conditions feel dangerously humid and sweltering, even with some scattered thunderstorms in the forecast.
With a heat advisory currently affecting dozens of counties across Kentucky, the National Weather Service in Louisville is closely monitoring the situation. But no matter how uncomfortable the 90°F (32.2°C) days might feel now, they’re still milder than the hottest day ever recorded in the Bluegrass State.
The hottest day ever recorded in Kentucky
July 28, 1930 still holds the title as the scorching peak in Kentucky weather history. On that day, Greenburg, located about 82 miles south of Louisville, endured an unprecedented high of 114°F (45.5°C).
This blistering temperature, verified by the NWS, remains the state’s all-time heat record — a record that has stood unchallenged for nearly a century. That year, the summer of 1930 was brutally hot across much of the United States, but Kentucky saw some of the most extreme readings.
Air conditioning in the 1930s? Not even close
Back in 1930, air conditioning was still a futuristic concept for the average Kentucky household. The first window-mounted AC unit wouldn’t be patented until 1931, and it wasn’t until 1932 that models became commercially available — for the wealthiest Americans only.
With prices between $10,000 and $50,000 back then (equivalent to $236,000–$1.2 million today), the vast majority of Kentuckians had to brave the heat with nothing more than open windows and fans.
Louisville’s own record heat: Three scorching days
While Greenburg claims the state’s top temperature, Louisville has also endured some extreme summer heat. The city’s record high is 107°F (41.7°C) — reached three times: July 14, 1936, July 28, 1930, and July 24, 1901.
Notably, July 28, 1930 remains a shared milestone, marking it as one of the hottest dates statewide and locally.
Louisville’s weather extremes: rain, snow, and bitter cold
Beyond summer heat, Louisville and the rest of Kentucky have seen their share of wild weather over the decades.
The heaviest 24-hour rainfall occurred on March 1, 1997, when Louisville recorded 10.48 inches (266.2 mm) of rain — the highest statewide total on record.
For snow, Lewisport holds the record with 20 inches (50.8 cm) in a single day on December 23, 2004, while Louisville saw 15.5 inches (39.4 cm) on January 17, 1994.
And the coldest temperature ever recorded in Kentucky? That would be -37°F (-38.3°C) in Shelbyville, Shelby County, on January 19, 1994. That same morning, Louisville dropped to a chilling -22°F (-30°C).
Forecast for Louisville: Hot, humid, and stormy through Sunday
Tuesday: Expect mostly sunny skies with only a 20% chance of afternoon showers and thunderstorms. Highs will approach 97°F (36.1°C), with a low around 76°F (24.4°C).
Wednesday: A bit more unsettled, with patchy morning fog, then a slight chance of showers and thunderstorms after 11 a.m. Temperatures will reach 96°F (35.5°C), dipping to 75°F (23.8°C) overnight. Heat index values will again flirt with 105°F (40.5°C).
Thursday: Conditions stay hot and mostly sunny, with more afternoon thunderstorms possible. High near 94°F (34.4°C), low around 76°F (24.4°C).
Friday: A 40% chance of showers and storms under mostly sunny skies. High near 94°F (34.4°C), with an overnight low of 75°F (23.8°C).
Saturday: Storm activity increases, with showers and thunderstorms likely in the afternoon. Daytime highs near 93°F (33.8°C), low around 74°F (23.3°C). 60% chance of rain.
Sunday: Continued storm potential, partly sunny with more showers and thunderstorms likely. High near 93°F (33.8°C), low again near 74°F (23.3°C). Precipitation chance remains at 60%.
