Marathon, FL Weather Forecast
Local 7-day forecast
Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Marathon, FL in one place.
A slight chance of showers and thunderstorms. Partly sunny, with a high near 90. East wind 5 to 10 mph.
Local Weather Overview
This forecast page for Marathon, FL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 14, 2026 9:45 PM EDT.
The active forecast window currently covers Jul 16 to Jul 21, 2026 for Marathon, FL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 16 to Jul 21, 2026
- Latest sync
- Jul 14, 2026 9:45 PM EDT
- Forecast office
- KEY
- Source
- NOAA / NWS
Daily Outlook
This Week in Marathon
Thursday looks like the warmest upcoming period in Marathon at 90 degrees F.
Friday Night is the coolest period ahead with temperatures near 83 degrees F.
The strongest winds are forecast for Thursday at about 5 to 10 mph E.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 9:45 PM EDT
- Coverage
- 6 days
- Time zone
- America/New_York
- Forecast office
- KEY
- Radar station
- KBYX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 84. East wind around 5 mph.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 83.
A slight chance of rain showers before 8am. Mostly sunny, with a high near 89.
A slight chance of rain showers after 8pm. Partly cloudy, with a low around 83.
A slight chance of rain showers before 8am. Mostly sunny, with a high near 89.
Mostly clear, with a low around 83.
Sunny, with a high near 89.
Mostly clear, with a low around 84.
Sunny, with a high near 89.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Jul 16
|
Slight Chance Showers And Thunderstorms
|
90°F |
5 to 10 mph
E
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms
|
84°F |
5 mph
E
|
|
Friday
Jul 17
|
Slight Chance Showers And Thunderstorms
|
90°F |
5 mph
E
|
|
Friday Night
Jul 17
|
Slight Chance Showers And Thunderstorms
|
83°F |
5 mph
E
|
|
Saturday
Jul 18
|
Slight Chance Rain Showers then Mostly Sunny
|
89°F |
5 mph
SE
|
|
Saturday Night
Jul 18
|
Slight Chance Rain Showers
|
83°F |
5 to 10 mph
SE
|
|
Sunday
Jul 19
|
Slight Chance Rain Showers then Mostly Sunny
|
89°F |
5 to 10 mph
S
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
83°F |
5 mph
S
|
|
Monday
Jul 20
|
Sunny
|
89°F |
5 mph
S
|
|
Monday Night
Jul 20
|
Mostly Clear
|
84°F |
5 to 10 mph
SE
|
|
Tuesday
Jul 21
|
Sunny
|
89°F |
5 to 10 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Marathon.
