Louisville starts Friday, September 11, with clusters of showers and thunderstorms continuing that morning. Showers and thunderstorms are expected to continue through the morning commute, setting up a soggy start to the weekend.
Storms are likely before 11 a.m., followed by additional shower and thunderstorm chances through the afternoon. The high should reach near 83 degrees under mostly cloudy skies, with light, variable winds and southeast winds most likely early.
Heavy Downpours Could Bring Localized Flooding
The National Weather Service Louisville office says slow-moving storms could produce briefly intense rainfall. Most locations could receive roughly half an inch to 1 inch of additional rain through Saturday, while isolated spots could see more than 2 inches.
Friday night will see lows in the mid and upper 60s, with showers and thunderstorms possible at times overnight; no watches, warnings or advisories are posted for the area.
Why Heavy Rain Can Cause Flooding
According to the Louisville and Jefferson County Metropolitan Sewer District, Louisville Metro is prone to flash flooding throughout the year, with street runoff and sewer and drainage problems among the factors that can contribute to flooding.
For infrastructure context, MSD defines a combined sewer system as a single-pipe system that carries both wastewater and stormwater runoff.
Saturday Looks Stormy Before Sunshine Returns
Saturday is expected to be the wettest day of the weekend, with showers and thunderstorms likely after a chance of early-morning rain. Highs should reach the low to mid 80s, and localized precipitation totals of 2 inches or more are possible.
Saturday night will be dry as the shortwave pushes east and convection diminishes, with lows in the mid and upper 60s. Sunday turns mostly sunny and warmer near 89 degrees, followed by sunny conditions Monday with a high around 87.
Heat Builds Back Next Week
Tuesday and Wednesday could both reach about 92 degrees as the pattern turns hotter and mostly dry. Tuesday should remain dry, while isolated shower and storm chances are possible across the northern forecast area Wednesday, so the forecast shifts quickly from umbrellas to plenty of sunscreen.
Outdoor plans Friday and Saturday should allow room for sudden downpours and temporary flooding in low-lying areas. The more reliable dry stretch arrives Sunday through Tuesday, although afternoon heat will return in a hurry.
