Guam/Andersen AFB climate by month
Averages and records for each calendar month at Guam/Andersen AFB, Guam, from 1949 to 2026. The warmest month is June, averaging 29.2°C; the coolest is January at 27.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 27.6°C | 23.9°C | 30.0°C25 January 1950 | 18.9°C14 January 1963 | 24 / 24 |
| February | 27.6°C | 23.7°C | 31.7°C7 February 1950 | 21.1°C13 February 1954 | 24 / 24 |
| March | 27.9°C | 23.9°C | 31.0°C21 March 2025 | 20.6°C8 March 1949 | 24 / 24 |
| April | 28.4°C | 24.4°C | 31.1°C17 April 1970 | 20.6°C9 April 1953 | 24 / 24 |
| May | 28.9°C | 24.9°C | 32.2°C26 May 1970 | 18.9°C11 May 1951 | 24 / 24 |
| June | 29.2°C | 25.1°C | 32.2°C20 June 1970 | 21.1°C4 June 1962 | 24 / 24 |
| July | 29.0°C | 24.7°C | 32.2°C31 July 1967 | 21.1°C13 July 1962 | 24 / 24 |
| August | 29.0°C | 24.5°C | 32.8°C2 August 1967 | 21.1°C12 August 1953 | 24 / 24 |
| September | 28.8°C | 24.3°C | 32.2°C20 September 1949 | 21.7°C14 September 1950 | 23 / 24 |
| October | 28.8°C | 24.5°C | 31.7°C3 October 1949 | 21.7°C12 October 1950 | 22 / 23 |
| November | 28.8°C | 24.9°C | 31.7°C29 November 1953 | 20.6°C13 November 1957 | 23 / 23 |
| December | 28.1°C | 24.6°C | 31.0°C16 December 2025 | 20.0°C12 December 1962 | 23 / 23 |
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 22 to 24 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.