Weather forecast for: Oswego IL
Last Update: 1:21 am CDT Sep 17, 2026
Overnight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Cloudy, with a low around 66. Calm wind. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday: Showers and thunderstorms before 10am, then a slight chance of showers between 10am and noon. High near 78. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night: Mostly cloudy, with a low around 63. Northeast wind 5 to 10 mph.
Friday: Mostly cloudy, with a high near 76. East wind 5 to 10 mph, with gusts as high as 15 mph.
Friday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. East wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.
Saturday: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. High near 83. Chance of precipitation is 80%.
Saturday Night: Showers and possibly a thunderstorm. Low around 65. Chance of precipitation is 80%.
Sunday: A chance of showers. Mostly cloudy, with a high near 72.
Sunday Night: A chance of showers. Mostly cloudy, with a low around 56.
Monday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 67.
Monday Night: Mostly cloudy, with a low around 54.
Tuesday: Partly sunny, with a high near 68.
Tuesday Night: Partly cloudy, with a low around 54.
Wednesday: Mostly sunny, with a high near 73.
WeatherWorld.com
