Decatur, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Decatur, a city in Adams County, Indiana.
This Afternoon
68°F
Scattered Rain Showers
Scattered rain showers. Mostly cloudy, with a high near 68. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
7-day forecast for Decatur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Scattered Rain Showers | 10 to 15 mph SW | 48% |
| Tonight | 49°F | Mostly Cloudy | 10 mph SW | 10% |
| Thursday | 59°F | Mostly Cloudy | 10 to 15 mph SW | 8% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 10 mph W | 44% |
| Friday | 52°F | Chance Rain Showers | 5 to 10 mph NW | 30% |
| Friday Night | 36°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 21% |
| Saturday | 51°F | Partly Sunny | 5 to 10 mph NW | 1% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 1% |
| Monday | 59°F | Sunny | 5 to 10 mph W | 0% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Tuesday | 61°F | Sunny | 5 to 10 mph W | 0% |
| Tuesday Night | 37°F | Mostly Clear | 0 to 5 mph NW | 2% |
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 Nov 5, 2026.