Marathon, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marathon, a community in Clermont County, Ohio.
This Afternoon
86°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 86. Southwest wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Marathon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 86°F | Chance Showers And Thunderstorms | 7 mph SW | 37% |
| Tonight | 67°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 mph S | 60% |
| Sunday | 87°F | Chance Rain Showers then Chance Showers And Thunderstorms | 6 to 9 mph SW | 36% |
| Sunday Night | 61°F | Showers And Thunderstorms Likely | 9 mph N | 56% |
| Monday | 74°F | Chance Rain Showers | 13 mph NE | 49% |
| Monday Night | 56°F | Chance Showers And Thunderstorms | 9 to 14 mph NE | 51% |
| Tuesday | 72°F | Chance Showers And Thunderstorms | 12 mph NE | 44% |
| Tuesday Night | 57°F | Chance Showers And Thunderstorms | 6 to 12 mph NE | 47% |
| Wednesday | 72°F | Showers And Thunderstorms Likely | 9 mph NE | 55% |
| Wednesday Night | 56°F | Showers And Thunderstorms Likely | 5 to 12 mph NE | 55% |
| Thursday | 71°F | Mostly Cloudy | 6 to 9 mph NE | 12% |
| Thursday Night | 54°F | Mostly Cloudy | 5 to 9 mph NE | 10% |
| Friday | 72°F | Mostly Sunny | 6 to 10 mph NE | 10% |
| Friday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Marathon (39.145, -84.006). Updated through the day.
Growing snapshot for Marathon
Last spring frost
Apr 23
First fall frost
Oct 18
Growing season
177 days
Hardiness zone
6b
More local growing data for Marathon: nearby ZIP 45176 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Amelia
Batavia
Bethel
Chilo
Day Heights
Felicity
Goshen
Loveland
Miamiville
Moscow
Mount Repose
Neville
New Richmond
Owensville
Remington
Williamsburg
Withamsville
Climate data from the nearest NOAA station, Milford, Oh (15.5 mi from Marathon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.