| National Weather Service Forecast for:
Decatur IL Issued by: National Weather Service Lincoln, IL |
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| Updated: 2:52 am CDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 67. Light northeast wind. |
| Thursday |
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82. Northeast wind 5 to 7 mph. |
| Thursday Night |
Mostly clear, with a low around 62. North northeast wind around 6 mph becoming calm in the evening. |
| Friday |
Sunny, with a high near 84. Calm wind becoming west around 6 mph in the afternoon. |
| Friday Night |
A 30 percent chance of showers before 1am. Partly cloudy, with a low around 65. Light southwest wind. |
| Saturday |
Sunny, with a high near 82. Northwest wind 5 to 11 mph, with gusts as high as 17 mph. |
| Saturday Night |
Mostly clear, with a low around 61. North northwest wind 3 to 8 mph. |
| Sunday |
Mostly sunny, with a high near 80. |
| Sunday Night |
Partly cloudy, with a low around 59. |
| Monday |
Mostly sunny, with a high near 80. |
| Monday Night |
Partly cloudy, with a low around 61. |
| Tuesday |
Mostly sunny, with a high near 83. |
| Tuesday Night |
Partly cloudy, with a low around 64. |
| Wednesday |
Mostly sunny, with a high near 85. |
Forecast from NOAA-NWS for Decatur IL.
