Cynthiana, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cynthiana, a community in Pike County, Ohio.
This Afternoon
79°F
Mostly Cloudy
Mostly cloudy, with a high near 79. Northeast wind around 8 mph.
7-day forecast for Cynthiana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Cloudy | 8 mph NE | 4% |
| Tonight | 59°F | Partly Cloudy then Patchy Fog | 3 to 7 mph NE | 1% |
| Saturday | 83°F | Patchy Fog then Slight Chance Rain Showers | 3 mph SE | 18% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 5 mph S | 43% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 7 mph SW | 53% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 8 mph N | 53% |
| Monday | 76°F | Chance Showers And Thunderstorms | 9 mph NE | 42% |
| Monday Night | 59°F | Chance Showers And Thunderstorms | 7 to 12 mph NE | 53% |
| Tuesday | 73°F | Chance Showers And Thunderstorms | 9 mph NE | 53% |
| Tuesday Night | 59°F | Chance Showers And Thunderstorms | 6 to 10 mph NE | 52% |
| Wednesday | 71°F | Chance Rain Showers | 9 mph NE | 52% |
| Wednesday Night | 56°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 51% |
| Thursday | 71°F | Partly Sunny then Slight Chance Rain Showers | 8 mph N | 15% |
| Thursday Night | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 3 to 8 mph N | 15% |
Forecast source: National Weather Service (api.weather.gov) for Cynthiana (39.174, -83.348). Updated through the day.
Growing snapshot for Cynthiana
Last spring frost
Apr 24
First fall frost
Oct 20
Growing season
178 days
Hardiness zone
6b
More local growing data for Cynthiana: nearby ZIP 45624 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hillsboro, Oh (14.6 mi from Cynthiana). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.