Louisville is heading into a late-week stretch, though the available sources do not verify Friday’s high. Friday’s weather may include a few showers or thunderstorms.
Rain coverage is expected to be limited, around 20%, but the strongest storms could bring brief heavy downpours, lightning and wind gusts near 40 mph. Friday night, the available sources do not establish whether showers or thunderstorms will persist overnight.
A Hot Weekend, Then a Sharper Change
The heat is forecast to continue Saturday and Sunday. Saturday’s high should be near 93, but the available sources do not verify a heat index or afternoon precipitation forecast. Sunday is also included in the late-week outlook, but the available sources do not verify its temperature or humidity.
Monday's weather is discussed as a possible change in the pattern, but the available sources do not verify a high, storm forecast or Monday-night rain trend. The available sources also do not verify Tuesday's temperature or Wednesday and Thursday highs and lows.
How Unusual Is the Forecast Heat?
The National Weather Service Louisville climate report lists the normal high as 82 degrees and the record as 99, set in 1953.
Recent local climate history shows that September heat can persist, but it does not establish that this weekend reflects a long-term trend. In September 2016, Louisville recorded 13 days in the 90s—five days short of the monthly record, according to the National Weather Service Louisville.
Another comparison comes from September 2017, when every day from Sept. 15 through Sept. 29 was warmer than normal in Louisville. The National Weather Service also reported a 92-degree record high in the city on Sept. 27 that year, while noting that the month had no severe weather apart from flooding on Sept. 1, according to its monthly summary.
Those September examples show that extended late-season warmth has occurred before, but they do not predict how many storms will develop this weekend or prove that hot stretches are becoming more frequent. For the immediate forecast, residents should plan around the afternoon heat, drink water, seek shade and take breaks outdoors; during storms, they should move indoors when thunder is heard and remain alert for lightning, heavy rain and strong wind.
