Guam/Pat Intl climate by month
Averages and records for each calendar month at Guam/Pat Intl, Guam, from 1945 to 2026. The warmest month is June, averaging 31.1°C; the coolest is January at 29.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 29.6°C | 24.0°C | 34.4°C9 January 1989 | 18.9°C18 January 2000 | 80 / 80 |
| February | 29.7°C | 23.8°C | 33.9°C14 February 1946 | 18.3°C8 February 1973 | 80 / 80 |
| March | 30.1°C | 24.0°C | 33.9°C29 March 1964 | 18.9°C14 March 1965 | 79 / 79 |
| April | 30.7°C | 24.7°C | 35.6°C18 April 1971 | 20.0°C6 April 1965 | 78 / 79 |
| May | 30.9°C | 25.1°C | 34.4°C30 May 1971 | 21.1°C23 May 1951 | 80 / 80 |
| June | 31.1°C | 25.2°C | 35.0°C30 June 1969 | 21.1°C11 June 1949 | 80 / 80 |
| July | 30.8°C | 24.9°C | 35.0°C18 July 1969 | 21.1°C24 July 1949 | 80 / 80 |
| August | 30.5°C | 24.6°C | 34.4°C6 August 1994 | 21.1°C16 August 1949 | 80 / 80 |
| September | 30.6°C | 24.6°C | 34.4°C6 September 2016 | 21.1°C23 September 1945 | 80 / 81 |
| October | 30.6°C | 24.7°C | 33.9°C15 October 1966 | 19.4°C16 October 1966 | 79 / 80 |
| November | 30.6°C | 24.9°C | 33.3°C21 November 1964 | 20.0°C9 November 1967 | 80 / 80 |
| December | 30.1°C | 24.6°C | 32.8°C12 December 1984 | 20.0°C31 December 1962 | 80 / 80 |
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 78 to 80 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.