Marathon, FL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marathon, a city in Monroe County, Florida.
This Afternoon
89°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny, with a high near 89. South wind 0 to 5 mph. Chance of precipitation is 40%.
7-day forecast for Marathon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 89°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 40% |
| Tonight | 82°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 40% |
| Wednesday | 89°F | Showers And Thunderstorms Likely | 10 mph E | 63% |
| Wednesday Night | 83°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 10 to 15 mph E | 63% |
| Thursday | 89°F | Chance Showers And Thunderstorms | 10 to 15 mph E | 51% |
| Thursday Night | 83°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 15 mph E | 61% |
| Friday | 89°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 15 mph E | 61% |
| Friday Night | 83°F | Chance Showers And Thunderstorms | 15 mph SE | 51% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 10 to 15 mph SE | 51% |
| Saturday Night | 83°F | Chance Showers And Thunderstorms | 10 to 15 mph E | 32% |
| Sunday | 89°F | Chance Showers And Thunderstorms | 15 mph E | 32% |
| Sunday Night | 83°F | Chance Showers And Thunderstorms | 15 mph E | 27% |
| Monday | 89°F | Chance Showers And Thunderstorms | 10 to 15 mph E | 27% |
| Monday Night | 84°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph E | 18% |
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 Aug 4, 2026.