Weather forecast for: Marietta IL
Last Update: 11:26 am CDT Sep 29, 2026
Today: Mostly sunny, with a high near 78. South wind 5 to 8 mph.
Tonight: A 40 percent chance of showers, mainly after 3am. Mostly cloudy, with a low around 63. South southeast wind around 6 mph, with gusts as high as 16 mph.
Wednesday: Showers and thunderstorms likely before 1pm, then a chance of showers. Cloudy, with a high near 73. South southwest wind 3 to 6 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 68. Southeast wind 3 to 5 mph. Winds could gust as high as 17 mph.
Thursday: Showers. High near 76. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.
Thursday Night: Showers, with thunderstorms also possible after 1am. Low around 61. Calm wind becoming north northeast around 6 mph after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 66. Northeast wind 7 to 9 mph, with gusts as high as 21 mph.
Friday Night: Partly cloudy, with a low around 52.
Saturday: Mostly sunny, with a high near 66.
Saturday Night: Mostly cloudy, with a low around 53.
Sunday: Mostly sunny, with a high near 67.
Sunday Night: Mostly clear, with a low around 48.
Monday: Sunny, with a high near 65.
WeatherWorld.com
