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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.