O Fallon, MO

Current conditions, hourly and 7-day forecast, and live radar for O Fallon, MO 63366. Right now: chance showers and thunderstorms then showers and thunderstorms likely, 70°F. Data from the National Weather Service.

• Tonight: A chance of showers and thunderstorms between 8pm and 11pm, then showers and thunderstorms likely between 11pm and 3am, then a chance of showers and thunderstorms between 3am and 4am, then showers and thunderstorms. Mostly cloudy, with a low around 70. East wind around 2 mph. Chance of precipitation is 80%.
• Thursday: Showers and thunderstorms before noon, then a chance of showers and thunderstorms between noon and 1pm. Cloudy, with a high near 79. Northwest wind around 3 mph. Chance of precipitation is 80%.
• Thursday Night: Mostly cloudy, with a low around 64. Northeast wind around 2 mph.
• Friday: Partly sunny, with a high near 82. East wind around 3 mph.
• Friday Night: Mostly clear, with a low around 66. Southeast wind around 2 mph.
• Saturday: A slight chance of rain showers between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Chance of precipitation is 20%.