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Marathon, FL
Full City Profile · Florida · Monroe County County
3.1
/5.0
B
Good
9,831
Population
1,163/sq mi density
$80,556
Median Income
$47,703 per capita
$683,700
Home Value
$804,549 Zillow
$1,592
Median Rent
33.4% income on rent
79°F
Avg Temperature
330 sunny days/yr
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$80,556 median income, 3.5% unemployment
D
Affordability
1.9 / 5.0
$683,700 home value, $1,592/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
B+
Education
3.6 / 5.0
33.0% bachelor's degree or higher
Marathon has a warm climate with an average annual temperature of 79°F (26°C). Winters average 70°F in January while summers reach 85°F in July. The area gets 330 sunny days per year. Annual precipitation totals 39.7 inches. Air quality is rated Good with a median AQI of 41.
Temperature
70°F Jan (21°C)
85°F Jul (30°C)
| Annual Average | 78.8°F |
| 46% above US avg | |
| January Average | 70°F (21°C) |
| July Average | 85°F (30°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 5 ft (2 m) |
| Area | 8.5 sq mi (21.9 km²) |
| Population Density | 1,163/sq mi |
| Coordinates | 24.7323°N, 81.0251°W |
| Timezone | America/New_York |
| County | Monroe County County |
| Nearest Airport | The Florida Keys Marathon International (MTH) 2 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.6 / 100 |
| Social Vulnerability | 53.9 / 100 |
| Community Resilience | 29.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively High |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | No Rating |
| Lightning | Relatively High |
| Drought | No Rating |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 70°F (21°C) | 1.9 in | |
| February | 70°F (21°C) | 1.7 in | Coldest, Driest |
| March | 73°F (23°C) | 1.7 in | |
| April | 76°F (24°C) | 1.9 in | |
| May | 80°F (26°C) | 4.8 in | |
| June | 82°F (28°C) | 7.2 in | Wettest |
| July | 85°F (30°C) | 3.9 in | Warmest |
| August | 84°F (29°C) | 5.8 in | |
| September | 83°F (28°C) | 6.7 in | |
| October | 80°F (26°C) | 4.9 in | |
| November | 75°F (24°C) | 2.1 in | |
| December | 71°F (22°C) | 1.7 in |
Marathon has a seasonal temperature swing of 15°F / from 70°F in February to 85°F in July. Total annual precipitation is 44.1 inches, with June being the wettest month (7.2") and February the driest (1.7").