See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
23°
Overcast
Feels Like: 14°
Min: 17°
Max: 31°
The next few hours will be overcast, with today reaching 31°C and dropping to 16°C. The coming days will be cloudy
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:43
Sunrise
18:56
Sunset
Moon
Waxing Crescent
12:35
Moonrise
21:05
Moonset
Daily Forecast
Today
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Air Quality Data Available
Upgrade to access real-time air quality data for Decatur.
Resources
UV Index
Humidity
Weather in Decatur today, September 16, 2026
Expect a muted, overcast feel in Decatur on September 16, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. Cloud leads the morning, peaking close to 100% near 05:00. Sunshine has little room until later in the day.
The day peaks near 31°C and cools toward 17°C. Moisture in the air spans 60%-94%, with the highest values around 05:00. A lighter breeze peaks around 07:00 near 3.7 km/h.
Expect persistent cloud later on, with amounts around 94% by 12:00. Sunshine remains the exception, not the rule. Visibility stays generally good near 15.4 km on average, though it can drop toward 12.9 km in thicker cloud or showers. Expect sunrise at 06:43, sunset at 18:56, and 12 hours 12 minutes of sunlight today overall.
Taken together, overcast skies in Decatur on September 16, 2026 favour indoor or covered options, with temperatures near 31°C.
Frequently asked questions about weather in Decatur
How warm does it get in Decatur?
The warmest month in Decatur is July, with average high temperatures of 30°C. The average temperature during this period is around 25°C.
How cold does it get in Decatur?
The coldest month in Decatur is January, with average low temperatures of -5°C. The average temperature during this period is around -2°C.
What is the wettest time of year in Decatur?
The wettest month in Decatur is July, with an average of 132mm of precipitation.
What is the driest time of year in Decatur?
The driest month in Decatur is December, with an average of 58mm of precipitation.
Explore more weather forecasts
- Taylorville, Illinois
- New York City, New York
- Lincoln, Illinois
- Los Angeles, California
- Springfield, Illinois
- Brooklyn, New York
- Mattoon, Illinois
- Chicago, Illinois
- Chatham, Illinois
- Houston, Texas
- Champaign, Illinois
- Queens, New York
- Urbana, Illinois
- Phoenix, Arizona
- Bloomington, Illinois
- Philadelphia, Pennsylvania
