St. Louis, MO – Temperatures are dropping fast across Missouri tonight, and patchy frost could form by early Sunday morning as lows dip into the upper 30s, posing a risk to sensitive plants.
According to the National Weather Service in St. Louis, cooler air settling into the region will keep overnight temperatures low enough for frost development, especially in rural and low-lying areas. The window for frost formation will be strongest between 3 a.m. and 7 a.m. Sunday across eastern and central Missouri.
Cities including St. Louis, Columbia, and Jefferson City may see localized frost, while outlying areas and valleys face a higher risk. Gardeners are urged to cover plants or bring them indoors to prevent damage.
Despite the chilly start, a rapid warm-up begins immediately after sunrise. Highs will climb into the 60s Sunday, then surge into the 70s and even upper 70s by Tuesday and Wednesday. This sharp rebound marks a return to above-average temperatures across the state.
Drivers should not expect major travel impacts, but early morning visibility could briefly drop in low-lying areas where frost or patchy fog develops.
The cold snap will be short-lived, with no additional frost concerns expected after Sunday morning. More updates will follow if temperatures trend colder overnight.
