Harman US

Decatur, IN Weather & Growing Conditions

Tonight
57°F
Partly Cloudy
Partly cloudy, with a low around 57. East wind around 5 mph.

7-day forecast

WhenTempForecastWindPrecip
Tonight 57°F Partly Cloudy 5 mph E 4%
Saturday 78°F Slight Chance Showers And Thunderstorms then Showers And Thunderstorms 5 mph SE 88%
Saturday Night 65°F Chance Showers And Thunderstorms 5 mph S 71%
Sunday 76°F Showers And Thunderstorms 5 to 10 mph NW 75%
Sunday Night 56°F Showers And Thunderstorms Likely 10 to 15 mph NE 67%
Monday 66°F Chance Showers And Thunderstorms 10 to 15 mph NE 60%
Monday Night 52°F Chance Showers And Thunderstorms 15 mph NE 41%
Tuesday 64°F Chance Rain Showers 15 mph NE 26%
Tuesday Night 53°F Chance Rain Showers 10 to 15 mph NE 27%
Wednesday 65°F Slight Chance Rain Showers 10 mph NE 23%
Wednesday Night 53°F Slight Chance Rain Showers then Mostly Cloudy 5 to 10 mph N 17%
Thursday 67°F Mostly Cloudy 5 to 10 mph N 7%
Thursday Night 53°F Mostly Cloudy 5 to 10 mph NE 7%
Friday 69°F Partly Sunny 5 to 10 mph NE 5%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Decatur, IN

Last spring frost
Apr 23
First fall frost
Oct 19
Growing season
178 days
Hardiness zone
6a

Explore more for Decatur, IN: full frost dates · planting calendar · Indiana frost dates

Climate data from the nearest NOAA station, Decatur 1 N, In (1.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.