Sullivan, IN Weather & Growing Conditions
This Afternoon
67°F
Mostly Cloudy
Mostly cloudy. High near 67, with temperatures falling to around 62 in the afternoon. West southwest wind around 12 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Mostly Cloudy | 12 mph WSW | 8% |
| Tonight | 46°F | Mostly Cloudy | 2 to 8 mph WSW | 5% |
| Thursday | 63°F | Mostly Sunny | 5 to 12 mph WSW | 0% |
| Thursday Night | 43°F | Mostly Cloudy | 1 to 6 mph WNW | 6% |
| Friday | 56°F | Mostly Cloudy | 3 to 10 mph NNW | 2% |
| Friday Night | 32°F | Partly Cloudy | 3 to 8 mph NNW | 1% |
| Saturday | 55°F | Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 30°F | Mostly Clear | 3 mph NW | 0% |
| Sunday | 59°F | Sunny | 1 to 6 mph WNW | 0% |
| Sunday Night | 32°F | Mostly Clear | 0 to 3 mph NW | 0% |
| Monday | 64°F | Sunny | 0 to 6 mph WSW | 0% |
| Monday Night | 35°F | Clear | 5 mph SW | 0% |
| Tuesday | 65°F | Sunny | 5 mph W | 1% |
| Tuesday Night | 37°F | Mostly Clear | 0 to 3 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sullivan, IN
Last spring frost
Apr 14
First fall frost
Oct 26
Growing season
193 days
Hardiness zone
6b
Explore more for Sullivan, IN: full frost dates · planting calendar · Indiana frost dates
Climate data from the nearest NOAA station, Shakamak Sp, In (10.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.