Information server for southern Guam natural resources
Climate of Guam
The climate of Guam is characterized as tropical marine. The weather is generally hot and very humid with little seasonal temperature variation. The mean high temperature is 81 °F (27 °C) and mean low is 76 °F (24 °C). The coolest months are January and February, when temperatures fall to mid to low 70s °F (20s °C) at night. Daily maximums and minimums vary no more than 10 °F (6 °C). Relative humidity ranges from 65-80% during daylight hours to 85-100% at night.
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