Decatur, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Decatur, a city in Adams County, Indiana.
Overnight
57°F
Clear
Clear, with a low around 57. South wind around 0 mph.
7-day forecast for Decatur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Clear | 0 mph | 0% |
| Tuesday | 81°F | Sunny | 0 mph | 0% |
| Tuesday Night | 59°F | Mostly Clear | 0 mph | 0% |
| Wednesday | 84°F | Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 64°F | Partly Cloudy | 0 to 5 mph SW | 8% |
| Thursday | 82°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 59% |
| Thursday Night | 65°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 59% |
| Friday | 82°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 59% |
| Friday Night | 64°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 42% |
| Saturday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph SW | 15% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 15% |
| Sunday | 85°F | Mostly Sunny | 5 to 15 mph SW | 14% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 29% |
| Monday | 85°F | Chance Rain Showers | 10 mph SW | 29% |
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 Aug 4, 2026.