Illinois · NWS ILX office

Decatur, IL weather

It is 52°F and clear at Decatur Airport as of Oct 28, 7:00 AM CDT. Today: Mostly Sunny, high near 78°F. Forecast from the National Weather Service, issued Oct 28, 6:36 AM CDT.

Updated Oct 28, 7:20 AM CDT (snapshot)

Current conditions

Temperature

52°F

Clear

Wind

SSW 3 mph

Humidity 87% · dew point 48°F

Pressure · visibility

30.24 inHg

Visibility 10 mi

Observed at Decatur Airport (KDEC), Oct 28, 7:00 AM CDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Decatur forecast zone right now.

Around the NWS ILX forecast area

No active alerts in zones served by the ILX office near Decatur.

From the alert snapshot of Oct 28, 2026, 8:14 AM EDT. No alerts are active anywhere in Illinois.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Decatur (local time)
TimeTempForecastPrecip. chanceWind
Wed 7 AM50°FPartly Sunny0%S 5 mph
Wed 8 AM52°FPartly Sunny0%S 5 mph
Wed 9 AM57°FPartly Sunny0%S 6 mph
Wed 10 AM63°FPartly Sunny0%S 7 mph
Wed 11 AM68°FPartly Sunny0%S 8 mph
Wed 12 PM72°FMostly Sunny0%S 9 mph
Wed 1 PM75°FMostly Sunny0%S 10 mph
Wed 2 PM76°FMostly Sunny0%S 10 mph
Wed 3 PM77°FSunny0%S 10 mph
Wed 4 PM78°FSunny0%S 10 mph
Wed 5 PM77°FSunny0%S 9 mph
Wed 6 PM73°FClear0%S 8 mph
Wed 7 PM69°FClear0%S 7 mph
Wed 8 PM64°FClear1%S 7 mph
Wed 9 PM62°FMostly Clear1%S 7 mph
Wed 10 PM61°FMostly Clear1%S 8 mph
Wed 11 PM60°FMostly Clear1%S 8 mph
Thu 12 AM61°FMostly Clear1%S 8 mph
Thu 1 AM60°FMostly Clear1%S 8 mph
Thu 2 AM60°FMostly Clear3%S 8 mph
Thu 3 AM59°FMostly Clear3%SSW 8 mph
Thu 4 AM58°FMostly Clear3%SSW 9 mph
Thu 5 AM58°FMostly Clear1%SSW 8 mph
Thu 6 AM57°FSunny1%SSW 8 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Decatur can differ.

7-day forecast

Today

High 78°F·Low 57°F

Mostly sunny, with a high near 78. South wind 5 to 10 mph.

Tonight: Mostly clear, with a low around 57. South wind around 9 mph, with gusts as high as 16 mph.

Thursday

High 79°F·Low 53°F

Sunny, with a high near 79. West southwest wind around 10 mph, with gusts as high as 17 mph.

Thursday Night: Partly cloudy, with a low around 53. North northeast wind 3 to 7 mph.

Friday

High 76°F·Low 55°F

A slight chance of rain showers after 7am. Partly sunny, with a high near 76. East wind around 8 mph.

Friday Night: A slight chance of rain showers. Mostly cloudy, with a low around 55. East wind around 7 mph.

Saturday

High 72°F·Low 54°F

A slight chance of rain showers before 1pm. Mostly cloudy, with a high near 72. East southeast wind around 6 mph.

Saturday Night: A chance of rain showers after 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.

Sunday

High 69°F·Low 54°F

A chance of rain showers. Mostly cloudy, with a high near 69. Chance of precipitation is 50%.

Sunday Night: A slight chance of rain showers. Mostly cloudy, with a low around 54.

Monday

High 70°F·Low 55°F

A chance of rain showers. Mostly cloudy, with a high near 70.

Monday Night: Rain showers likely. Mostly cloudy, with a low around 55.

Tuesday

High 70°F·Low 51°F

Rain showers likely. Mostly cloudy, with a high near 70.

Tuesday Night: A chance of rain showers. Mostly cloudy, with a low around 51.

Nearby cities

See every city we cover in Illinois, or check all active alerts.

About this forecast

Forecast office
Decatur is served by the National Weather Service ILX forecast office, forecast zone ILZ053, county zone ILC115.
Location used
The Census Bureau's internal point for Decatur (39.8560, -88.9337), in Macon County. Population: 68,763 (2024 estimate), number 17 of the 121 Illinois cities on this site.
Radar
Nearest NWS radar: KILX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/39.856,-88.9337 (forecast issued Oct 28, 6:36 AM CDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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