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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

WhenTempForecastWindPrecip
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

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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.