San Juan/Marin Intl climate by month
Averages and records for each calendar month at San Juan/Marin Intl, Puerto Rico, from 1956 to 2026. The warmest month is August, averaging 31.7°C; the coolest is January at 28.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 28.5°C | 21.8°C | 33.3°C11 January 1982 | 16.1°C31 January 1962 | 71 / 71 |
| February | 28.7°C | 21.7°C | 35.6°C27 February 1983 | 16.7°C22 February 1956 | 71 / 71 |
| March | 29.3°C | 22.1°C | 35.6°C19 March 1983 | 15.6°C3 March 1957 | 71 / 71 |
| April | 30.0°C | 22.9°C | 36.1°C17 April 1983 | 17.8°C12 April 1968 | 71 / 71 |
| May | 30.8°C | 23.9°C | 35.6°C5 May 1980 | 18.9°C5 May 1962 | 71 / 71 |
| June | 31.6°C | 24.7°C | 36.1°C22 June 1983 | 20.6°C20 June 1956 | 71 / 71 |
| July | 31.4°C | 25.0°C | 35.0°C10 July 1981 | 20.6°C1 July 1959 | 71 / 71 |
| August | 31.7°C | 25.1°C | 36.1°C21 August 1980 | 21.1°C24 August 1956 | 71 / 71 |
| September | 31.7°C | 24.9°C | 36.1°C1 September 1981 | 20.6°C6 September 1960 | 70 / 71 |
| October | 31.4°C | 24.5°C | 36.7°C9 October 1981 | 19.4°C20 October 1959 | 70 / 70 |
| November | 30.1°C | 23.5°C | 35.6°C6 November 1981 | 18.9°C24 November 1956 | 70 / 70 |
| December | 28.9°C | 22.6°C | 34.4°C6 December 1989 | 17.2°C22 December 1964 | 70 / 70 |
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 70 to 71 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.