Weather forecast for: Sparta IL
Last Update: 5:36 am CDT Sep 12, 2026
Today: Sunny, with a high near 90. Light west wind.
Tonight: Mostly clear, with a low around 65. Calm wind.
Sunday: A slight chance of showers before 4pm, then a slight chance of showers and thunderstorms between 4pm and 5pm. Partly sunny, with a high near 89. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night: A 30 percent chance of showers and thunderstorms, mainly between 7pm and 1am. Mostly cloudy, with a low around 62. Northeast wind 3 to 5 mph.
Monday: Mostly sunny, with a high near 88. Northeast wind around 7 mph becoming southeast in the afternoon.
Monday Night: Mostly clear, with a low around 67.
Tuesday: Sunny, with a high near 95.
Tuesday Night: Mostly clear, with a low around 70.
Wednesday: Sunny, with a high near 94.
Wednesday Night: Mostly clear, with a low around 69.
Thursday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Thursday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Friday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.