Key West Intl climate by month
Averages and records for each calendar month at Key West Intl, United States, from 1948 to 2026. The warmest month is August, averaging 32.1°C; the coolest is January at 23.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 23.9°C | 18.3°C | 30.0°C29 January 1991 | 5.0°C13 January 1981 | 75 / 75 |
| February | 24.6°C | 19.0°C | 30.0°C17 February 2023 | 7.2°C5 February 1996 | 75 / 75 |
| March | 26.1°C | 20.7°C | 31.1°C24 March 1994 | 8.3°C3 March 1986 | 75 / 75 |
| April | 27.8°C | 22.5°C | 32.2°C25 April 1991 | 8.9°C2 April 1987 | 75 / 75 |
| May | 29.6°C | 24.5°C | 34.4°C14 May 2019 | 17.2°C8 May 2016 | 75 / 75 |
| June | 31.1°C | 25.9°C | 35.0°C28 June 2023 | 20.0°C28 June 1961 | 75 / 75 |
| July | 31.9°C | 26.6°C | 35.6°C3 July 2023 | 20.6°C17 July 1952 | 75 / 75 |
| August | 32.1°C | 26.5°C | 35.6°C15 August 2024 | 20.0°C11 August 1952 | 75 / 75 |
| September | 31.3°C | 25.9°C | 35.0°C3 September 2007 | 20.6°C17 September 1985 | 74 / 75 |
| October | 29.4°C | 24.5°C | 33.9°C5 October 1962 | 15.6°C28 October 1957 | 74 / 74 |
| November | 26.8°C | 22.0°C | 31.7°C5 November 1988 | 9.4°C30 November 1959 | 74 / 74 |
| December | 24.8°C | 19.6°C | 31.1°C22 December 1948 | 6.7°C27 December 1985 | 74 / 74 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 74 to 75 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.