New Harmony, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Harmony, a town in Posey County, Indiana.
Today
86°F
Sunny
Sunny. High near 86, with temperatures falling to around 84 in the afternoon. Northeast wind around 2 mph.
7-day forecast for New Harmony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 2 mph NE | 0% |
| Tonight | 64°F | Mostly Clear | 1 mph NNE | 0% |
| Wednesday | 88°F | Sunny | 1 mph W | 0% |
| Wednesday Night | 68°F | Mostly Clear | 1 mph SSE | 3% |
| Thursday | 88°F | Slight Chance Rain Showers | 1 to 5 mph SSW | 15% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 3 mph S | 41% |
| Friday | 88°F | Chance Showers And Thunderstorms | 5 mph SW | 41% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph SSW | 35% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 5 mph SSW | 35% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 mph S | 27% |
| Sunday | 90°F | Mostly Sunny | 2 to 7 mph SSW | 11% |
| Sunday Night | 72°F | Mostly Clear | 5 mph SSW | 10% |
| Monday | 92°F | Sunny | 3 to 8 mph SSW | 8% |
| Monday Night | 73°F | Mostly Clear | 6 mph SSW | 13% |
Forecast source: National Weather Service (api.weather.gov) for New Harmony (38.129, -87.931). Updated through the day.
Growing snapshot for New Harmony
Last spring frost
Apr 7
First fall frost
Oct 28
Growing season
202 days
Hardiness zone
7a
More local growing data for New Harmony: nearby ZIP 47631 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mt Vernon, In (12.5 mi from New Harmony). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.