Cynthiana, OH Weather & Growing Conditions
Today
84°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 84. Southeast wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 6 mph SE | 25% |
| Tonight | 66°F | Chance Showers And Thunderstorms | 6 mph S | 70% |
| Sunday | 86°F | Chance Rain Showers then Chance Showers And Thunderstorms | 8 mph SW | 43% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely | 8 mph N | 55% |
| Monday | 72°F | Chance Rain Showers | 10 mph NE | 47% |
| 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% |
| Friday Night | 50°F | Partly Cloudy | 5 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.