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Guam Standard Time is 10 hours ahead of Greenwich Mean Time ( GMT+10 ).
Weather in Guam in October. The average maximum daytime temperature in Guam in October is a hot 31Â°C (88Â°F) with very high heat & humidity. There are usually 4 hours of bright sunshine each day, which represents 37% of the 12 hours of daylight. The average sea temperature in and around Guam in October is 29Â°C (84Â°F). Expect 317mm (12.5 inches) of rainfall across the whole of October with 22 days with some rain falling. Maximum UV levels will be extreme (11+ UV index) at midday when the skies are clear.