Agana, Guam International Airport weather by month
Averages and records for each calendar month at Agana, Guam International Airport, United States, 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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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
- Guam/Pat Intl, Guam
- Guam/Andersen AFB, Guam
- Rota Intl, Northern Mariana Islands
- Yap Island Intl, Micronesia
- Meno Isl/Chuuk Intl, Micronesia
- Palau/Tmetochl Intl, Palau
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.