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Porter Lake, IL 7-Day Night Weather Forecast
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Porter Lake, IL Weather Forecast
Porter Lake, IL Weather Forecast Date: 1227 PM CDT Fri Aug 14 2026
The area/counties/county of: Monroe County Il, Jefferson County Mo.or toggle through each period.
This Afternoon... Mostly sunny. Hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 110.
Tonight... Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 104 early in the evening.
Saturday... Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 108.
Saturday Night... Mostly clear. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 105 early in the evening.
Sunday... Mostly sunny. Hot with highs in the upper 90s. West winds around 5 mph. Heat index values up to 111.
Sunday Night... Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the lower 70s. Chance of rain 50%. Heat index values up to 110 early in the evening.
Monday... Mostly sunny with a slight chance of showers and thunderstorms. Not as warm with highs in the upper 80s. Chance of rain 20%.
Monday Night... Partly cloudy. Lows in the upper 60s.
Tuesday... Mostly clear. Highs in the upper 80s. Lows in the lower 70s.
Tuesday Night... Mostly clear. Highs in the upper 80s. Lows in the lower 70s.
Wednesday... Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105 in the afternoon.
Wednesday Night... Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the lower 70s. Chance of rain 30%. Heat index values up to 100 early in the evening.
POP = Probability of Precipitation
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