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Niantic, IL Weather Forecast
Niantic, IL Weather Forecast Date: 1127 PM CDT Thu Sep 10 2026
The area/counties/county of: Macon, including the city of Decatur.or toggle through each period.
Rest of Tonight... Mostly cloudy. Patchy fog. Near steady temperature in the mid 60s. East winds around 5 mph.
Friday... Patchy fog in the morning. Mostly cloudy. Highs in the lower 80s. East winds around 5 mph.
Friday Night... Partly cloudy. Lows in the mid 60s. Southeast winds around 5 mph.
Saturday... Mostly sunny. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph, becoming west in the afternoon.
Saturday Night... Mostly clear. Lows in the mid 60s. Southwest winds around 5 mph.
Sunday... Partly cloudy. Highs in the mid 80s. Lows in the lower 60s.
Monday... Partly cloudy. Highs in the mid 80s. Lows in the lower 60s.
Monday Night... Mostly clear. Lows in the upper 60s.
Tuesday... Sunny. A chance of showers in the afternoon. Highs in the upper 80s. Chance of rain 30%.
Tuesday Night... Partly cloudy with a chance of showers. Lows in the mid 60s. Chance of rain 50%.
Wednesday... Showers likely, mainly in the morning. Highs in the lower 80s. Chance of rain 60%.
Wednesday Night... Mostly cloudy with a 50% chance of showers. Lows in the mid 60s.
POP = Probability of Precipitation
Niantic Radar Loop
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