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Newcastle, IL 7-Day Night Weather Forecast
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Newcastle, IL Weather Forecast
Newcastle, IL Weather Forecast Date: 128 PM CDT Thu Sep 17 2026
The area/counties/county of: Saline, including the city of Harrisburg.or toggle through each period.
This Afternoon... Sunny, hot. Near steady temperature in the upper 90s. West winds around 5 mph.
Tonight... Mostly clear. Lows in the mid 70s. Southwest winds around 5 mph in the evening, becoming light and variable.
Friday... Sunny, hot with highs in the upper 90s. Calm winds, becoming northwest around 5 mph in the afternoon.
Friday Night... Mostly clear. Lows in the lower 70s. Calm winds.
Saturday... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph.
Saturday Night... Partly cloudy. Hot. Lows in the lower 70s. Highs in the upper 90s.
Sunday... Partly cloudy. Hot. Lows in the lower 70s. Highs in the upper 90s.
Monday... Mostly sunny. Highs in the lower 90s.
Monday Night... Mostly cloudy. A chance of showers in the evening. Lows in the mid 60s. Chance of rain 30%.
Tuesday... Partly cloudy. Highs in the lower 80s. Lows in the upper 50s.
POP = Probability of Precipitation
Newcastle Radar Loop
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