Marathon, FL
Full City Profile · Florida · Monroe County County
3.2
/5.0
B
Good
9,831
Population
1,163/sq mi density
$80,556
Median Income
$47,703 per capita
$683,700
Home Value
$833,157 Zillow
$1,592
Median Rent
33.4% income on rent
79°F
Avg Temperature
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.0 / 5.0
$80,556 median income, 5.4% unemployment
D
Affordability
1.9 / 5.0
$683,700 home value, $1,592/mo rent
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. Annual precipitation totals 39.7 inches. The area receives 0.0 inches of snow annually.
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) |
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
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) | 1.6 in | Coldest |
| February | 72°F (22°C) | 1.7 in | |
| March | 75°F (24°C) | 1.3 in | Driest |
| April | 78°F (26°C) | 2.1 in | |
| May | 82°F (28°C) | 3.4 in | |
| June | 84°F (29°C) | 4.2 in | |
| July | 85°F (30°C) | 3.8 in | |
| August | 86°F (30°C) | 5.3 in | Warmest |
| September | 84°F (29°C) | 6.4 in | Wettest |
| October | 81°F (27°C) | 5.9 in | |
| November | 76°F (24°C) | 1.8 in | |
| December | 73°F (23°C) | 2.2 in |
Marathon has a seasonal temperature swing of 16°F / from 70°F in January to 86°F in August. Total annual precipitation is 39.7 inches, with September being the wettest month (6.4") and March the driest (1.3").