Cass, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cass, a community in Sullivan County, Indiana.
Today
84°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 84. East northeast wind around 2 mph.
7-day forecast for Cass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Fog then Sunny | 2 mph ENE | 0% |
| Tonight | 63°F | Mostly Clear | 1 mph NE | 0% |
| Wednesday | 86°F | Sunny | 2 mph WSW | 0% |
| Wednesday Night | 67°F | Partly Cloudy | 1 mph S | 5% |
| Thursday | 85°F | Scattered Showers And Thunderstorms | 1 to 5 mph SSW | 35% |
| Thursday Night | 69°F | Scattered Showers And Thunderstorms | 0 to 3 mph S | 50% |
| Friday | 85°F | Scattered Showers And Thunderstorms | 0 to 5 mph SSW | 37% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph SSW | 37% |
| Saturday | 86°F | Slight Chance Showers And Thunderstorms | 1 to 5 mph SSW | 25% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SSW | 18% |
| Sunday | 88°F | Sunny | 2 to 7 mph SSW | 11% |
| Sunday Night | 72°F | Mostly Clear | 6 mph SSW | 11% |
| Monday | 89°F | Mostly Sunny | 3 to 7 mph SSW | 13% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 6 mph SSW | 28% |
Forecast source: National Weather Service (api.weather.gov) for Cass (39.088, -87.277). Updated through the day.
Growing snapshot for Cass
Last spring frost
Apr 14
First fall frost
Oct 26
Growing season
193 days
Hardiness zone
6b
More local growing data for Cass: nearby ZIP 47848 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Carlisle
Dugger
Fairbanks
Farmersburg
Graysville
Hymera
Merom
New Lebanon
Paxton
Pleasantville
Shelburn
Sullivan
Climate data from the nearest NOAA station, Shakamak Sp, In (8.3 mi from Cass). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.