Weather in Guam

To summarize Guam climate it is essentially tropical marine; generally warm and humid, moderated by northeast trade winds, dry season extends from January to June, rainy season begins from July and continues through December and there is only a little temperature variation from one season to another. With pleasant year round weather in Guam, it is peak tourism season all 12 months of the year in Guam.

Guam has only two seasons, the dry and the rainy. The dry season, locally known as "fanumnangan," begins in December through June. At other time of the year it is rainy season, locally known as "fanuchanan,"

Average annual temperature of Guam: 81 degrees, generally, the range is from the low 70s to the middle 80s.


Annual rainfall in Guam: 80 to 110 inches

For month-by-month information about weather in Guam, refer to the following table:

Weather Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average in Fahrenheit 76 77 78 79 79 80 80 80 79 80 80 79
Average in Centigrade 24 25 26 26 26 27 27 27 26 27 27 26
Rainfall in inches 5.16 4.26 2.97 4.03 4.49 5.19 9.59 12.16 14.08 14.40 8.51 5.85
Relative humidity % 77 76 75 74 73 76 76 81 81 80 80 78
Daily Sunshine Hours 11.15 11.30 11.51 12.16 12.40 12.58 13.00 12.47 12.24 12.00 11.35 11.18



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