National Weather Service Forecast for: Decatur IL
Issued by: National Weather Service Lincoln, IL
Updated: 12:03 pm CDT May 4, 2026
 
This
Afternoon
This Afternoon: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Patchy blowing dust. Partly sunny, with a high near 77. Breezy, with a southwest wind 18 to 21 mph, with gusts as high as 31 mph.
Chance
T-storms and
Breezy
 Tonight

Tonight: A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 52. South southwest wind 8 to 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Showers
Likely
 Tuesday

Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Cloudy, with a high near 59. North northeast wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely
 Tuesday
Night
Tuesday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 44. North northeast wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Showers
Likely
 Wednesday

Wednesday: Partly sunny, with a high near 56. North wind 7 to 9 mph, with gusts as high as 16 mph.
Partly Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 39. Northwest wind 5 to 8 mph.
Partly Cloudy

 Thursday

Thursday: Mostly sunny, with a high near 61. West wind 5 to 10 mph, with gusts as high as 18 mph.
Mostly Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 46.
Mostly Clear

 Friday

Friday: Mostly sunny, with a high near 68.
Mostly Sunny
Hi 77 °F Lo 52 °F Hi 59 °F Lo 44 °F Hi 56 °F Lo 39 °F Hi 61 °F Lo 46 °F Hi 68 °F

Hazardous Weather Outlook
Blowing Dust Advisory
 

This Afternoon
 
 A 30 percent chance of showers and thunderstorms, mainly after 3pm. Patchy blowing dust. Partly sunny, with a high near 77. Breezy, with a southwest wind 18 to 21 mph, with gusts as high as 31 mph.
Tonight
 
 A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 52. South southwest wind 8 to 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Cloudy, with a high near 59. North northeast wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
 
 Showers likely, mainly before 1am. Mostly cloudy, with a low around 44. North northeast wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
 
 Partly sunny, with a high near 56. North wind 7 to 9 mph, with gusts as high as 16 mph.
Wednesday Night
 
 Partly cloudy, with a low around 39. Northwest wind 5 to 8 mph.
Thursday
 
 Mostly sunny, with a high near 61. West wind 5 to 10 mph, with gusts as high as 18 mph.
Thursday Night
 
 Mostly clear, with a low around 46.
Friday
 
 Mostly sunny, with a high near 68.
Friday Night
 
 A 30 percent chance of showers before 1am. Partly cloudy, with a low around 47.
Saturday
 
 Sunny, with a high near 73.
Saturday Night
 
 Partly cloudy, with a low around 51.
Sunday
 
 A chance of showers. Partly sunny, with a high near 70.

 

Forecast from NOAA-NWS for Decatur IL.