National Weather Service Forecast for: Decatur IL
Issued by: National Weather Service Lincoln, IL
Updated: 3:41 pm CDT Jun 13, 2025
 
This
Afternoon
This Afternoon: Showers likely and possibly a thunderstorm. Cloudy, with a high near 81. East southeast wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
Likely

 Tonight

Tonight: Showers likely and possibly a thunderstorm before 9pm, then a chance of showers and thunderstorms between 9pm and midnight, then a chance of showers after midnight. Mostly cloudy, with a low around 68. East northeast wind 5 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Showers
Likely

 Saturday

Saturday: A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Mostly cloudy, with a high near 80. North northeast wind 6 to 8 mph. Chance of precipitation is 20%.
Slight Chance
Showers then
Slight Chance
T-storms
 Saturday
Night
Saturday Night: Partly cloudy, with a low around 65. North northeast wind 5 to 7 mph.
Partly Cloudy

 Sunday

Sunday: Mostly sunny, with a high near 83. Northeast wind 3 to 6 mph.
Mostly Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 67. East northeast wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Monday

Monday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Light and variable wind becoming southeast around 5 mph.
Partly Sunny
then Chance
T-storms
 Monday
Night
Monday Night: Mostly cloudy, with a low around 69.
Mostly Cloudy

 Tuesday

Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Partly Sunny
then Chance
T-storms
Hi 81 °F Lo 68 °F Hi 80 °F Lo 65 °F Hi 83 °F Lo 67 °F Hi 85 °F Lo 69 °F Hi 87 °F

Hazardous Weather Outlook
 

This Afternoon
 
 Showers likely and possibly a thunderstorm. Cloudy, with a high near 81. East southeast wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
 
 Showers likely and possibly a thunderstorm before 9pm, then a chance of showers and thunderstorms between 9pm and midnight, then a chance of showers after midnight. Mostly cloudy, with a low around 68. East northeast wind 5 to 7 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
 
 A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Mostly cloudy, with a high near 80. North northeast wind 6 to 8 mph. Chance of precipitation is 20%.
Saturday Night
 
 Partly cloudy, with a low around 65. North northeast wind 5 to 7 mph.
Sunday
 
 Mostly sunny, with a high near 83. Northeast wind 3 to 6 mph.
Sunday Night
 
 Partly cloudy, with a low around 67. East northeast wind around 5 mph becoming calm in the evening.
Monday
 
 A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Light and variable wind becoming southeast around 5 mph.
Monday Night
 
 Mostly cloudy, with a low around 69.
Tuesday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Tuesday Night
 
 A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Wednesday
 
 Showers and thunderstorms likely. Partly sunny, with a high near 87.
Wednesday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Juneteenth
 
 A chance of showers. Mostly sunny, with a high near 82.

 

Forecast from NOAA-NWS for Decatur IL.