Sullivan, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sullivan, a city in Sullivan County, Indiana.
Tonight
69°F
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms before 5am. Partly cloudy. Low around 69, with temperatures rising to around 71 overnight. East wind 5 to 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sullivan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 69°F | Scattered Showers And Thunderstorms | 5 to 8 mph E | 24% |
| Saturday | 93°F | Mostly Sunny then Scattered Showers And Thunderstorms | 7 mph S | 29% |
| Saturday Night | 71°F | Mostly Cloudy | 6 mph S | 13% |
| Sunday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph W | 19% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 8 mph NNE | 38% |
| Monday | 79°F | Showers And Thunderstorms Likely | 7 to 10 mph NE | 56% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 7 to 13 mph NE | 56% |
| Tuesday | 74°F | Chance Showers And Thunderstorms | 10 mph NNE | 40% |
| Tuesday Night | 56°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 12 mph NNE | 20% |
| Wednesday | 72°F | Partly Sunny | 5 to 9 mph NNE | 5% |
| Wednesday Night | 55°F | Mostly Cloudy | 3 to 9 mph N | 5% |
| Thursday | 74°F | Mostly Sunny | 3 to 8 mph N | 4% |
| Thursday Night | 57°F | Partly Cloudy | 3 to 8 mph NNE | 4% |
| Friday | 75°F | Mostly Sunny | 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 19, 2026.