Weather forecast for: Belvidere IL
Last Update: 10:36 am CDT Sep 19, 2026
Today: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 2pm, then showers likely and possibly a thunderstorm after 2pm. High near 76. South wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tonight: Showers and thunderstorms, mainly before 4am. Low around 60. East wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday: Showers and thunderstorms likely before 8am, then a chance of showers. Cloudy, with a high near 68. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 53. Northeast wind around 15 mph, with gusts as high as 25 mph.
Monday: A 30 percent chance of showers, mainly before 1pm. Cloudy, with a high near 63. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 48.
Tuesday: Mostly cloudy, with a high near 62.
Tuesday Night: Partly cloudy, with a low around 47.
Wednesday: Partly sunny, with a high near 65.
Wednesday Night: Partly cloudy, with a low around 48.
Thursday: Partly sunny, with a high near 67.
Thursday Night: Partly cloudy, with a low around 49.
Friday: Partly sunny, with a high near 70.
WeatherWorld.com
City of Belvidere, IL
