Decatur, IN Weather & Growing Conditions
Today
76°F
Showers And Thunderstorms
Showers and thunderstorms before 4pm, then a chance of showers and thunderstorms. Cloudy, with a high near 76. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Showers And Thunderstorms | 5 mph E | 79% |
| Tonight | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph S | 67% |
| Sunday | 75°F | Showers And Thunderstorms Likely | 5 to 10 mph NW | 70% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 57% |
| Monday | 65°F | Chance Rain Showers | 10 to 15 mph NE | 51% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Tuesday | 64°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph NE | 17% |
| Tuesday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Wednesday | 65°F | Chance Rain Showers | 10 mph NE | 43% |
| Wednesday Night | 52°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Thursday | 67°F | Mostly Cloudy | 5 to 10 mph NE | 8% |
| Thursday Night | 51°F | Mostly Cloudy | 5 to 10 mph NE | 7% |
| Friday | 69°F | Mostly Sunny | 5 to 10 mph NE | 7% |
| Friday Night | 50°F | Partly Cloudy | 5 to 10 mph NE | 7% |
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.