New Harmony, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Harmony, a town in Posey County, Indiana.
This Afternoon
99°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Sunny. High near 99, with temperatures falling to around 95 in the afternoon. South wind around 2 mph. Chance of precipitation is 20%.
7-day forecast for New Harmony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Slight Chance Showers And Thunderstorms | 2 mph S | 21% |
| Tonight | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph ESE | 22% |
| Saturday | 97°F | Sunny | 2 to 6 mph SSW | 12% |
| Saturday Night | 73°F | Partly Cloudy | 5 mph S | 9% |
| Sunday | 97°F | Mostly Sunny | 3 to 7 mph W | 11% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Rain Showers | 6 mph NNE | 17% |
| Monday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph NNE | 43% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 7 to 13 mph NNE | 43% |
| Tuesday | 77°F | Chance Showers And Thunderstorms | 7 to 13 mph NNE | 36% |
| Tuesday Night | 58°F | Mostly Cloudy | 5 to 14 mph N | 10% |
| Wednesday | 76°F | Mostly Sunny | 5 to 9 mph N | 4% |
| Wednesday Night | 57°F | Partly Cloudy | 3 to 9 mph NNE | 3% |
| Thursday | 78°F | Mostly Sunny | 3 to 9 mph N | 3% |
| Thursday Night | 59°F | Partly Cloudy | 3 to 8 mph NNE | 3% |
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 Sep 19, 2026.