Marathon, FL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marathon, a city in Monroe County, Florida.
Tonight
80°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Partly cloudy, with a low around 80. East wind 5 to 10 mph. Chance of precipitation is 60%.
7-day forecast for Marathon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 80°F | Showers And Thunderstorms Likely | 5 to 10 mph E | 57% |
| Saturday | 87°F | Showers And Thunderstorms Likely | 5 mph E | 58% |
| Saturday Night | 81°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 61% |
| Sunday | 87°F | Showers And Thunderstorms Likely | 5 mph S | 61% |
| Sunday Night | 81°F | Showers And Thunderstorms Likely | 5 to 10 mph S | 60% |
| Monday | 88°F | Showers And Thunderstorms Likely | 5 to 10 mph S | 60% |
| Monday Night | 81°F | Showers And Thunderstorms Likely | 5 to 10 mph S | 69% |
| Tuesday | 88°F | Showers And Thunderstorms Likely | 5 to 10 mph S | 70% |
| Tuesday Night | 81°F | Showers And Thunderstorms | 5 to 10 mph SE | 76% |
| Wednesday | 87°F | Showers And Thunderstorms | 5 to 10 mph SE | 76% |
| Wednesday Night | 81°F | Showers And Thunderstorms | 5 to 10 mph SE | 76% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 68% |
| Thursday Night | 81°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 67% |
| Friday | 88°F | Showers And Thunderstorms Likely | 5 mph E | 67% |
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 Sep 19, 2026.