Harman US

Cynthiana, OH Weather & Growing Conditions

Overnight
61°F
Mostly Cloudy
Mostly cloudy, with a low around 61. Northeast wind around 3 mph.

7-day forecast

WhenTempForecastWindPrecip
Overnight 61°F Mostly Cloudy 3 mph NE 1%
Saturday 85°F Partly Sunny then Slight Chance Showers And Thunderstorms 5 mph SE 24%
Saturday Night 66°F Chance Showers And Thunderstorms 6 mph S 60%
Sunday 86°F Chance Rain Showers then Chance Showers And Thunderstorms 8 mph SW 33%
Sunday Night 59°F Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 9 mph N 55%
Monday 72°F Chance Rain Showers 10 mph NE 53%
Monday Night 54°F Showers And Thunderstorms Likely 8 to 12 mph NE 58%
Tuesday 71°F Chance Showers And Thunderstorms 9 mph NE 50%
Tuesday Night 56°F Showers And Thunderstorms Likely 6 to 10 mph NE 59%
Wednesday 70°F Rain Showers Likely 10 mph E 61%
Wednesday Night 54°F Showers And Thunderstorms Likely 6 to 9 mph NE 61%
Thursday 70°F Chance Rain Showers then Mostly Cloudy 8 mph NE 30%
Thursday Night 53°F Mostly Cloudy 5 to 8 mph NE 14%
Friday 70°F Mostly Sunny 6 to 9 mph NE 10%

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 Sep 19, 2026.