Marathon (FL) Temperature by Month
Marathon, Florida, United States of America has an average annual maximum temperature of 28°C (82°F), with moderate seasonal shifts ranging from 24°C (75°F) in January to 33°C (91°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Marathon Monthly Temperatures
Marathon experiences balanced seasonal shifts, with noticeable but moderate temperature variations. At night, minimum temperatures range from 27°C (81°F) in August to 18°C (64°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Marathon by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. August, the warmest month, gets 309 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Marathon vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Marathon vs World: Temperature Compared
Marathon's average annual maximum temperature is 28°C (82°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Marathon?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Marathon, January is the coolest month, with average highs of 24°C (75°F) and humidity around 75% — considered high. In August, the warmest month, temperatures average 33°C (91°F) with 73% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Marathon's weather — including monthly rainfall, sunshine hours, and humidity — visit our Marathon climate page.
