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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

WhenTempForecastWindPrecip
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

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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.