Sullivan, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sullivan, a city in Sullivan County, Indiana.
This Afternoon
93°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Partly sunny. High near 93, with temperatures falling to around 90 in the afternoon. South southwest wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Sullivan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 93°F | Slight Chance Showers And Thunderstorms | 5 mph SSW | 22% |
| Tonight | 70°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 mph S | 16% |
| Sunday | 91°F | Mostly Sunny | 5 to 8 mph WSW | 12% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 6 to 9 mph NNE | 49% |
| Monday | 78°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph NE | 57% |
| Monday Night | 58°F | Chance Showers And Thunderstorms | 7 to 10 mph NE | 47% |
| Tuesday | 73°F | Chance Showers And Thunderstorms | 7 to 10 mph NE | 37% |
| Tuesday Night | 56°F | Chance Showers And Thunderstorms | 5 to 10 mph NNE | 25% |
| Wednesday | 73°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 5 to 9 mph N | 15% |
| Wednesday Night | 56°F | Partly Cloudy | 3 to 9 mph N | 4% |
| Thursday | 75°F | Partly Sunny | 3 to 7 mph N | 2% |
| Thursday Night | 57°F | Mostly Cloudy | 2 to 7 mph NNE | 2% |
| Friday | 77°F | Partly Sunny | 3 to 8 mph NNE | 3% |
| Friday Night | 55°F | Partly Cloudy | 3 to 8 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Sullivan (39.097, -87.407). Updated through the day.
Growing snapshot for Sullivan
Last spring frost
Apr 14
First fall frost
Oct 26
Growing season
193 days
Hardiness zone
6b
More local growing data for Sullivan: nearby ZIP 47882 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Carlisle
Cass
Dugger
Fairbanks
Farmersburg
Graysville
Hymera
Merom
New Lebanon
Paxton
Pleasantville
Shelburn
Climate data from the nearest NOAA station, Shakamak Sp, In (10.3 mi from Sullivan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.