Marathon weather by month
What a typical year looks like in Marathon, Florida: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Marathon Airport, 2 km from Marathon; records cover 1998–2026.
The year at a glance
- Precipitation a year
- 39.7 in1009 mm
- Snow a year
- Rare
- Last spring freeze
- Rare
- First fall freeze
- Rare
- Heating degree days
- 71
- Cooling degree days
- 5,127
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 52°11° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Marathon in January
Highs average 76°24° and lows 64°18°, with 1.6 in42 mm of precipitation in a typical January.
- Record high
- 88°31° (2017)
- Record low
- 39°4° (2010)
- Heating degree days
- 33
- Cooling degree days
- 188
Marathon in February
Highs average 78°26° and lows 66°19°, with 1.7 in43 mm of precipitation in a typical February.
- Record high
- 89°32° (2019)
- Record low
- 43°6° (2009)
- Heating degree days
- 15
- Cooling degree days
- 218
Marathon in March
Highs average 81°27° and lows 69°20°, with 1.3 in34 mm of precipitation in a typical March.
- Record high
- 90°32° (2019)
- Record low
- 49°9° (2010)
- Heating degree days
- 5
- Cooling degree days
- 302
Marathon in April
Highs average 84°29° and lows 73°23°, with 2.1 in54 mm of precipitation in a typical April.
- Record high
- 94°34° (2015)
- Record low
- 56°13° (2003)
- Heating degree days
- 0
- Cooling degree days
- 399
Marathon in May
Highs average 88°31° and lows 76°24°, with 3.4 in85 mm of precipitation in a typical May.
- Record high
- 96°36° (2019)
- Record low
- 64°18° (2016)
- Heating degree days
- 0
- Cooling degree days
- 516
Marathon in June
Highs average 90°32° and lows 79°26°, with 4.2 in107 mm of precipitation in a typical June.
- Record high
- 98°37° (2019)
- Record low
- 65°18° (2008)
- Heating degree days
- 0
- Cooling degree days
- 582
Marathon in July
Highs average 91°33° and lows 79°26°, with 3.8 in96 mm of precipitation in a typical July.
- Record high
- 99°37° (2023)
- Record low
- 70°21° (2007)
- Heating degree days
- 0
- Cooling degree days
- 625
Marathon in August
Highs average 92°33° and lows 80°27°, with 5.3 in135 mm of precipitation in a typical August.
- Record high
- 97°36° (2002)
- Record low
- 70°21° (2007)
- Heating degree days
- 0
- Cooling degree days
- 640
Marathon in September
Highs average 90°32° and lows 78°26°, with 6.4 in162 mm of precipitation in a typical September.
- Record high
- 97°36° (2023)
- Record low
- 71°22° (2001)
- Heating degree days
- 0
- Cooling degree days
- 574
Marathon in OctoberThis month
Highs average 86°30° and lows 76°24°, with 5.9 in150 mm of precipitation in a typical October.
- Record high
- 93°34° (2009)
- Record low
- 58°14° (2008)
- Heating degree days
- 0
- Cooling degree days
- 496
Marathon in November
Highs average 81°27° and lows 71°22°, with 1.8 in45 mm of precipitation in a typical November.
- Record high
- 90°32° (2002)
- Record low
- 53°12° (2006)
- Heating degree days
- 1
- Cooling degree days
- 331
Marathon in December
Highs average 78°26° and lows 68°20°, with 2.2 in56 mm of precipitation in a typical December.
- Record high
- 88°31° (2016)
- Record low
- 44°7° (2010)
- Heating degree days
- 17
- Cooling degree days
- 256