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St. Marys, IL Weather Forecast
St. Marys, IL Weather Forecast Date: 637 AM CDT Mon Sep 28 2026
The area/counties/county of: Effingham, including the city of Effingham.or toggle through each period.
Today... Sunny. Highs in the upper 70s. North winds around 5 mph.
Tonight... Clear. Lows in the lower 50s. Northeast winds around 5 mph.
Tuesday... Sunny. Highs in the lower 80s. Southeast winds around 5 mph.
Tuesday Night... Partly cloudy. Lows in the upper 50s. Southeast winds around 5 mph.
Wednesday... Mostly sunny. Highs in the upper 80s. South winds 5 to 10 mph.
Wednesday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the upper 60s.
Thursday... Mostly cloudy with a 50% chance of showers. Highs in the mid 80s.
Thursday Night... Showers likely. Lows in the lower 60s. Chance of rain 60%.
Friday... Mostly cloudy in the morning, then becoming partly sunny. A 50% chance of showers. Cooler with highs in the lower 70s.
Friday Night... Mostly cloudy with a 40% chance of showers. Lows in the upper 50s.
Saturday... Mostly sunny with a 40% chance of showers. Highs around 70.
Saturday Night... Mostly cloudy with a 30% chance of showers. Lows in the upper 50s.
POP = Probability of Precipitation
St. Marys Radar Loop
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