Cass, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cass, a community in Sullivan County, Indiana.
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. East southeast wind around 6 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Cass
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 6 mph ESE | 9% |
| Saturday | 93°F | Mostly Sunny then Scattered Showers And Thunderstorms | 7 mph S | 31% |
| Saturday Night | 72°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 6 mph SSE | 15% |
| Sunday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 6 mph W | 19% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 7 mph NNE | 38% |
| Monday | 79°F | Showers And Thunderstorms Likely | 6 to 9 mph NE | 55% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 to 12 mph NE | 55% |
| Tuesday | 73°F | Chance Showers And Thunderstorms | 9 mph NNE | 41% |
| Tuesday Night | 57°F | Chance Showers And Thunderstorms then Mostly Cloudy | 3 to 10 mph NNE | 25% |
| Wednesday | 72°F | Partly Sunny | 5 to 8 mph NNE | 6% |
| Wednesday Night | 56°F | Mostly Cloudy | 2 to 8 mph N | 6% |
| Thursday | 74°F | Mostly Sunny | 2 to 7 mph N | 4% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 7 mph NNE | 4% |
| Friday | 75°F | Mostly Sunny | 2 to 8 mph NNE | 3% |
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 Sep 19, 2026.