Marathon, FL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marathon, a city in Monroe County, Florida.
Tonight
77°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly cloudy, with a low around 77. East wind 5 to 10 mph. Chance of precipitation is 50%.
7-day forecast for Marathon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 77°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 51% |
| Wednesday | 82°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph E | 51% |
| Wednesday Night | 77°F | Slight Chance Showers And Thunderstorms | 5 mph NE | 24% |
| Thursday | 82°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 16% |
| Thursday Night | 76°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 to 10 mph NE | 13% |
| Friday | 82°F | Sunny | 5 mph NE | 5% |
| Friday Night | 76°F | Mostly Clear | 5 mph NE | 5% |
| Saturday | 81°F | Sunny | 5 mph NE | 1% |
| Saturday Night | 75°F | Mostly Clear | 5 mph NE | 5% |
| Sunday | 81°F | Sunny | 5 mph N | 5% |
| Sunday Night | 74°F | Slight Chance Rain Showers | 5 to 10 mph N | 17% |
| Monday | 80°F | Slight Chance Rain Showers | 10 to 15 mph N | 24% |
| Monday Night | 73°F | Slight Chance Rain Showers | 15 to 20 mph NE | 24% |
| Tuesday | 80°F | Slight Chance Rain Showers | 15 to 20 mph NE | 22% |
Forecast source: National Weather Service (api.weather.gov) for Marathon (24.732, -81.025). Updated through the day.
Growing snapshot for Marathon
Growing season
365 days
Hardiness zone
11b
More local growing data for Marathon: nearby ZIP 33051 weather · frost dates · planting calendar · Florida frost dates
Nearby towns & communities
Big Coppitt Key
Big Pine Key
Cudjoe Key
Duck Key
Islamorada, Village of Islands
Key Colony Beach
Key Largo
Key West
Layton
North Key Largo
Stock Island
Tavernier
Climate data from the nearest NOAA station, Marathon Ap, Fl (1.9 mi from Marathon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.