Decatur, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Decatur, a city in Adams County, Indiana.
This Afternoon
74°F
Mostly Sunny
Mostly sunny, with a high near 74. Northeast wind around 5 mph.
7-day forecast for Decatur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Sunny | 5 mph NE | 2% |
| Tonight | 57°F | Partly Cloudy | 5 mph E | 14% |
| Saturday | 78°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph SE | 88% |
| Saturday Night | 65°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph S | 72% |
| Sunday | 76°F | Showers And Thunderstorms | 5 to 10 mph NW | 78% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 70% |
| 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% |
Forecast source: National Weather Service (api.weather.gov) for Decatur (40.829, -84.928). Updated through the day.
Growing snapshot for Decatur
Last spring frost
Apr 23
First fall frost
Oct 19
Growing season
178 days
Hardiness zone
6a
More local growing data for Decatur: nearby ZIP 46733 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Decatur 1 N, In (1.3 mi from Decatur). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.