Sullivan, OH Weather & Growing Conditions
Overnight
54°F
Mostly Cloudy
Mostly cloudy, with a low around 54. East wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Mostly Cloudy | 3 mph E | 0% |
| Saturday | 76°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SE | 32% |
| Saturday Night | 63°F | Showers And Thunderstorms Likely | 7 mph S | 71% |
| Sunday | 74°F | Showers And Thunderstorms | 8 to 12 mph W | 92% |
| Sunday Night | 52°F | Chance Rain Showers | 12 mph NE | 53% |
| Monday | 66°F | Mostly Cloudy then Chance Rain Showers | 13 mph NE | 27% |
| Monday Night | 49°F | Chance Rain Showers | 12 mph NE | 27% |
| Tuesday | 64°F | Chance Rain Showers | 13 mph NE | 26% |
| Tuesday Night | 50°F | Rain Showers Likely | 13 to 16 mph E | 66% |
| Wednesday | 64°F | Rain Showers Likely | 13 to 17 mph E | 66% |
| Wednesday Night | 50°F | Showers And Thunderstorms Likely | 14 mph E | 64% |
| Thursday | 66°F | Chance Showers And Thunderstorms | 12 mph E | 31% |
| Thursday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 9 mph NE | 19% |
| Friday | 68°F | Partly Sunny then Slight Chance Rain Showers | 5 to 12 mph NE | 16% |
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 Sep 19, 2026.