World Resorts Northern Mariana Islands Guam

Guam Monthly Weather Averages

Please click on any column to get detailed information about Guam weather in that particular month. You will get daily weather information for that month for the last several years.

Day & Night air temperature, °F

The warmest month in Guam is june. The average daily temp is 87.2°F. The average nightly temp is 82.3°F.

Sea water temperature, °F

The warmest sea temperature usually observed in August. Average daily sea water temperature during this month is 85.5°F.

Precipitation total, in.

March is the month with least precipitations during the year. The average precipitation totals for this month is 2.1 in. The month with most precipitation total is August.

Number of rainy days

This chart shows averages for the last three years. It shows medium and heavy rains only, it doesn't show light rains.

Wind speed, mph
Sunny, partly cloudy and cloudy days
Average sunny hours

Sunny hours are calculated based on the average daily number of hours while sunlight can reach the ground. It depends on day length and cloudiness during the day.

* Charts above show average data for the last 3 years.

Best time for vacation in Guam

Sunniest months:
July 6 days
August 5 days
September 5 days
Warmest months:
June 87.7 °F
July 87.6 °F
August 87.2 °F
Warmest sea temp:
August 85.5 °F
September 85.5 °F
July 85.4 °F
Coldest months:
February 83.3 °F
January 84.0 °F
March 84.3 °F
Rainiest months:
October 16 days
July 14 days
August 14 days
Windiest months:
December 17.4 mph
February 17.4 mph
January 16.9 mph

Guam on a weather map

Guam
+82°F
W 14 mph
Feels like: +90°F
Precip.: 100%
Places in Northern Mariana Islands:
Name
°F
+82°F
+84°F
+82°F
+82°F
+82°F
24 Hours Forecast
Guam
Local time: 21:00
November 22, friday
0000
82°F
W
15 mph
0300
82°F
SW
13 mph
0600
81°F
W
13 mph
0900
82°F
W
16 mph
1200
84°F
W
16 mph
1500
84°F
W
16 mph
1800
82°F
W
16 mph
2100
82°F
W
16 mph
Units of measurement: °C / °F