Weather WorldFoster Lake, IL 7-Day Night Weather Forecast
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Foster Lake, IL Weather Forecast
Foster Lake, IL Weather Forecast Date: 607 PM CDT Sat Oct 03 2026
The area/counties/county of: Greene County Il, Jersey County Il.or toggle through each period.
Tonight... Partly cloudy this evening, then clearing. Lows in the mid 40s. Southeast winds around 5 mph this evening, becoming light and variable.
Sunday... Sunny. Highs in the upper 70s. Northwest winds 5 to 10 mph.
Sunday Night... Mostly clear. Lows in the upper 40s. North winds 5 to 10 mph.
Monday... Sunny. Highs in the lower 70s. Northeast winds around 5 mph.
Monday Night... Clear. Lows in the mid 40s. East winds around 5 mph.
Tuesday... Sunny. Highs in the upper 70s.
Tuesday Night... Mostly clear. Lows in the lower 50s. Highs in the lower 80s.
Wednesday... Mostly clear. Lows in the lower 50s. Highs in the lower 80s.
Thursday... Mostly clear. Lows in the lower 50s. Highs in the lower 80s.
Friday... Clear. Highs in the lower 80s. Lows in the mid 50s.
Friday Night... Clear. Highs in the lower 80s. Lows in the mid 50s.
POP = Probability of Precipitation
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