Key West weather by month
What a typical year looks like in Key West, Florida: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Key West International Airport, 2 km from Key West; records cover 1872–2026.
The year at a glance
- Precipitation a year
- 40.4 in1027 mm
- Snow a year
- Rare
- Last spring freeze
- Rare
- First fall freeze
- Rare
- Heating degree days
- 46
- Cooling degree days
- 5,120
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 53°12° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Key West in January
Highs average 76°24° and lows 66°19°, with 1.8 in46 mm of precipitation in a typical January.
- Record high
- 90°32° (1877)
- Record low
- 41°5° (1886)
- Heating degree days
- 22
- Cooling degree days
- 197
Key West in February
Highs average 77°25° and lows 67°19°, with 1.5 in39 mm of precipitation in a typical February.
- Record high
- 87°31° (1874)
- Record low
- 44°7° (1899)
- Heating degree days
- 10
- Cooling degree days
- 214
Key West in March
Highs average 80°26° and lows 69°21°, with 1.5 in39 mm of precipitation in a typical March.
- Record high
- 89°32° (1873)
- Record low
- 47°8° (1986)
- Heating degree days
- 4
- Cooling degree days
- 297
Key West in April
Highs average 83°28° and lows 73°23°, with 2.1 in53 mm of precipitation in a typical April.
- Record high
- 91°33° (1881)
- Record low
- 48°9° (1987)
- Heating degree days
- 0
- Cooling degree days
- 386
Key West in May
Highs average 86°30° and lows 76°25°, with 3.1 in79 mm of precipitation in a typical May.
- Record high
- 94°34° (2019)
- Record low
- 63°17° (1877)
- Heating degree days
- 0
- Cooling degree days
- 501
Key West in June
Highs average 89°32° and lows 79°26°, with 4.2 in107 mm of precipitation in a typical June.
- Record high
- 96°36° (1881)
- Record low
- 65°18° (1932)
- Heating degree days
- 0
- Cooling degree days
- 572
Key West in July
Highs average 90°32° and lows 81°27°, with 3.6 in92 mm of precipitation in a typical July.
- Record high
- 97°36° (1880)
- Record low
- 68°20° (1888)
- Heating degree days
- 0
- Cooling degree days
- 632
Key West in August
Highs average 91°33° and lows 81°27°, with 5.4 in136 mm of precipitation in a typical August.
- Record high
- 97°36° (1956)
- Record low
- 68°20° (1894)
- Heating degree days
- 0
- Cooling degree days
- 637
Key West in September
Highs average 89°32° and lows 79°26°, with 7.2 in184 mm of precipitation in a typical September.
- Record high
- 95°35° (1872)
- Record low
- 69°21° (1892)
- Heating degree days
- 0
- Cooling degree days
- 573
Key West in OctoberThis month
Highs average 86°30° and lows 77°25°, with 5.7 in144 mm of precipitation in a typical October.
- Record high
- 93°34° (1962)
- Record low
- 59°15° (1892)
- Heating degree days
- 0
- Cooling degree days
- 505
Key West in November
Highs average 81°27° and lows 72°22°, with 2.1 in52 mm of precipitation in a typical November.
- Record high
- 91°33° (1876)
- Record low
- 49°9° (1959)
- Heating degree days
- 0
- Cooling degree days
- 348
Key West in December
Highs average 78°25° and lows 68°20°, with 2.2 in55 mm of precipitation in a typical December.
- Record high
- 88°31° (1876)
- Record low
- 44°7° (1876)
- Heating degree days
- 10
- Cooling degree days
- 258