37322 Weather (Decatur, TN)

Weather forecast for: Decatur TN

Last Update: 2:26 pm EDT Sep 19, 2026

Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 69. Calm wind.

Sunday: A 20 percent chance of showers and thunderstorms after 3pm. Sunny and hot, with a high near 93. Heat index values as high as 99. Southwest wind around 5 mph becoming calm in the afternoon.

Sunday Night: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 69. Calm wind.

Monday: A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 93. Heat index values as high as 100. Calm wind.

Monday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 60%.

Tuesday: A chance of showers before 11am, then a slight chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 88. Calm wind. Chance of precipitation is 80%.

Tuesday Night: Showers and possibly a thunderstorm before 2am, then showers likely. Low around 65. Calm wind. Chance of precipitation is 80%.

Wednesday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 82. Chance of precipitation is 80%.

Wednesday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Low around 63. Chance of precipitation is 80%.

Thursday: A 30 percent chance of showers, mainly before 2pm. Mostly sunny, with a high near 79.

Thursday Night: A 10 percent chance of showers. Partly cloudy, with a low around 60.

Friday: Mostly sunny, with a high near 80.

Friday Night: Mostly clear, with a low around 57.

Saturday: Mostly sunny, with a high near 79.