Key Largo weather by month
What a typical year looks like in Key Largo, Florida: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at John Pennekamp State Park, 10 km from Key Largo; records cover 2004–2026.
The year at a glance
- Precipitation a year
- 57 in1447 mm
- Snow a year
- Rare
- Last spring freeze
- Rare
- First fall freeze
- Rare
- Heating degree days
- 78
- Cooling degree days
- 4,741
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 47°8° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Key Largo in January
Highs average 76°25° and lows 63°17°, with 2.1 in54 mm of precipitation in a typical January.
- Record high
- 85°29° (2023)
- Record low
- 34°1° (2010)
- Heating degree days
- 32
- Cooling degree days
- 168
Key Largo in February
Highs average 78°26° and lows 65°18°, with 2 in51 mm of precipitation in a typical February.
- Record high
- 89°32° (2019)
- Record low
- 35°2° (2026)
- Heating degree days
- 18
- Cooling degree days
- 193
Key Largo in March
Highs average 80°27° and lows 67°19°, with 2.2 in56 mm of precipitation in a typical March.
- Record high
- 88°31° (2023)
- Record low
- 44°7° (2010)
- Heating degree days
- 6
- Cooling degree days
- 262
Key Largo in April
Highs average 83°28° and lows 71°22°, with 3.3 in85 mm of precipitation in a typical April.
- Record high
- 93°34° (2015)
- Record low
- 52°11° (2005)
- Heating degree days
- 0
- Cooling degree days
- 348
Key Largo in May
Highs average 85°30° and lows 74°23°, with 4.8 in121 mm of precipitation in a typical May.
- Record high
- 94°34° (2024)
- Record low
- 60°16° (2016)
- Heating degree days
- 0
- Cooling degree days
- 454
Key Largo in June
Highs average 88°31° and lows 77°25°, with 7.9 in201 mm of precipitation in a typical June.
- Record high
- 94°34° (2009)
- Record low
- 68°20° (2005)
- Heating degree days
- 0
- Cooling degree days
- 529
Key Largo in July
Highs average 90°32° and lows 79°26°, with 5.8 in148 mm of precipitation in a typical July.
- Record high
- 96°36° (2023)
- Record low
- 70°21° (2007)
- Heating degree days
- 0
- Cooling degree days
- 594
Key Largo in August
Highs average 90°32° and lows 79°26°, with 6.9 in175 mm of precipitation in a typical August.
- Record high
- 96°36° (2023)
- Record low
- 67°19° (2024)
- Heating degree days
- 0
- Cooling degree days
- 603
Key Largo in September
Highs average 89°32° and lows 78°25°, with 8.2 in208 mm of precipitation in a typical September.
- Record high
- 97°36° (2021)
- Record low
- 65°18° (2019)
- Heating degree days
- 0
- Cooling degree days
- 549
Key Largo in OctoberThis month
Highs average 86°30° and lows 75°24°, with 7.9 in200 mm of precipitation in a typical October.
- Record high
- 91°33° (2011)
- Record low
- 54°12° (2012)
- Heating degree days
- 0
- Cooling degree days
- 484
Key Largo in November
Highs average 81°27° and lows 70°21°, with 3.3 in84 mm of precipitation in a typical November.
- Record high
- 88°31° (2019)
- Record low
- 46°8° (2006)
- Heating degree days
- 3
- Cooling degree days
- 322
Key Largo in December
Highs average 78°26° and lows 66°19°, with 2.5 in64 mm of precipitation in a typical December.
- Record high
- 87°31° (2023)
- Record low
- 37°3° (2010)
- Heating degree days
- 19
- Cooling degree days
- 235