Cynthiana, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cynthiana, a community in Pike County, Ohio.
Today
66°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy, with a high near 66. South wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Cynthiana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Light Rain | 14 mph S | 98% |
| Tonight | 52°F | Light Rain Likely then Mostly Cloudy | 5 to 12 mph SW | 65% |
| Thursday | 65°F | Mostly Sunny | 5 to 12 mph SW | 0% |
| Thursday Night | 43°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 60°F | Chance Light Rain | 1 to 8 mph W | 26% |
| Friday Night | 37°F | Chance Light Rain then Mostly Cloudy | 5 to 8 mph NW | 26% |
| Saturday | 53°F | Partly Sunny | 5 to 8 mph NW | 3% |
| Saturday Night | 33°F | Partly Cloudy | 1 to 5 mph W | 0% |
| Sunday | 57°F | Mostly Sunny | 2 to 9 mph W | 2% |
| Sunday Night | 32°F | Mostly Clear | 6 mph W | 4% |
| Monday | 59°F | Sunny | 3 to 8 mph W | 3% |
| Monday Night | 34°F | Mostly Clear | 6 mph SW | 2% |
| Tuesday | 63°F | Sunny | 6 to 9 mph SW | 1% |
| Tuesday Night | 35°F | Mostly Clear | 5 mph W | 1% |
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 Nov 4, 2026.