Cynthiana, OH Weather & Growing Conditions
Tonight
59°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 4am. Mostly cloudy, with a low around 59. Southeast wind 6 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Mostly Cloudy then Chance Rain Showers | 6 to 10 mph SE | 29% |
| Wednesday | 68°F | Showers And Thunderstorms | 10 to 14 mph S | 99% |
| Wednesday Night | 54°F | Showers And Thunderstorms then Mostly Cloudy | 5 to 12 mph SW | 99% |
| Thursday | 67°F | Mostly Sunny | 3 to 12 mph SW | 1% |
| Thursday Night | 44°F | Partly Cloudy | 1 to 5 mph SW | 0% |
| Friday | 64°F | Partly Sunny | 1 to 8 mph NW | 5% |
| Friday Night | 40°F | Partly Cloudy | 6 mph NW | 12% |
| Saturday | 56°F | Mostly Sunny | 7 mph NW | 14% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 3 mph NW | 14% |
| Sunday | 57°F | Mostly Sunny | 2 to 8 mph W | 9% |
| Sunday Night | 34°F | Partly Cloudy | 6 mph W | 14% |
| Monday | 60°F | Slight Chance Light Rain | 5 to 9 mph W | 15% |
| Monday Night | 36°F | Mostly Clear | 7 mph W | 13% |
| Tuesday | 63°F | Mostly Sunny | 10 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cynthiana, OH
Last spring frost
Apr 24
First fall frost
Oct 20
Growing season
178 days
Hardiness zone
6b
Explore more for Cynthiana, OH: full frost dates · planting calendar · Ohio frost dates
Climate data from the nearest NOAA station, Hillsboro, Oh (14.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.