Cynthiana, KY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cynthiana, a city in Harrison County, Kentucky.
Today
90°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 90. South wind around 3 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Cynthiana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 mph S | 21% |
| Tonight | 67°F | Chance Showers And Thunderstorms | 5 mph S | 54% |
| Sunday | 90°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 8 mph SW | 18% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 6 mph N | 36% |
| Monday | 80°F | Chance Rain Showers | 5 to 8 mph NE | 42% |
| Monday Night | 57°F | Showers And Thunderstorms Likely | 5 to 8 mph NE | 56% |
| Tuesday | 74°F | Chance Rain Showers | 7 mph NE | 39% |
| Tuesday Night | 57°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph NE | 50% |
| Wednesday | 73°F | Chance Showers And Thunderstorms | 6 mph N | 51% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 2 to 6 mph N | 51% |
| Thursday | 72°F | Partly Sunny | 3 to 7 mph N | 12% |
| Thursday Night | 54°F | Mostly Cloudy | 2 to 7 mph N | 12% |
| Friday | 72°F | Mostly Sunny | 3 to 7 mph NE | 6% |
| Friday Night | 52°F | Partly Cloudy | 6 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Cynthiana (38.383, -84.302). Updated through the day.
Growing snapshot for Cynthiana
Last spring frost
Apr 18
First fall frost
Oct 23
Growing season
188 days
Hardiness zone
6b
More local growing data for Cynthiana: nearby ZIP 41031 weather · frost dates · planting calendar · Kentucky frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Cynthiana, Ky (2.5 mi from Cynthiana). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.