Sullivan, OH Weather & Growing Conditions
Overnight
59°F
Mostly Cloudy
Mostly cloudy, with a low around 59. South wind around 16 mph, with gusts as high as 28 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Mostly Cloudy | 16 mph S | 2% |
| Wednesday | 65°F | Light Rain | 16 to 20 mph S | 98% |
| Wednesday Night | 52°F | Light Rain Likely | 9 to 20 mph S | 74% |
| Thursday | 62°F | Partly Sunny | 8 to 16 mph SW | 0% |
| Thursday Night | 45°F | Mostly Cloudy | 5 to 10 mph SW | 14% |
| Friday | 54°F | Rain Showers Likely | 5 to 9 mph W | 61% |
| Friday Night | 38°F | Rain Showers Likely | 8 to 12 mph W | 61% |
| Saturday | 49°F | Chance Rain Showers | 12 mph W | 27% |
| Saturday Night | 33°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph W | 18% |
| Sunday | 53°F | Mostly Sunny | 7 to 13 mph W | 4% |
| Sunday Night | 33°F | Mostly Clear | 10 mph W | 4% |
| Monday | 55°F | Mostly Sunny | 7 to 10 mph W | 6% |
| Monday Night | 36°F | Mostly Clear | 7 to 10 mph SW | 5% |
| Tuesday | 59°F | Mostly Sunny | 9 to 13 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sullivan, OH
Last spring frost
Apr 29
First fall frost
Oct 19
Growing season
172 days
Hardiness zone
6a
Explore more for Sullivan, OH: full frost dates · planting calendar · Ohio frost dates
Climate data from the nearest NOAA station, Chippewa Lake, Oh (14.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.