August weather forecast
Guam, USA

In August, Guam remains deeply entrenched within the wet season. The temperatures during this period hover between 82°F (27.8°C) and 90°F (32.2°C). Along with July, August stands as one of the most humid and rain-drenched months for Guam, asserting the dominance of its tropical rainforest climate.

Across the breadth of Guam, the intensity of the rainfall is consistently felt. The island, having been under the influence of the wet season for a couple of months now, witnesses its landscapes frequently bathed in showers. This month continues the legacy of July's moisture-laden patterns, with the environment echoing the full force of the monsoon.

Compared to the preceding month of July, August often sees even more days of rainfall. Its standing as a peak month for precipitation is evident in the frequency of downpours. Yet, the northeast trade winds, flowing between 10mph (16.1km/h) and 20mph (32.2km/h), persist in their duty, providing intermittent breezy intervals amidst the persistent rain and humidity.

The surrounding ocean waters, although warm, become more turbulent due to the increased weather activity, including potential storms. Such conditions demand vigilance from those partaking in sea-based adventures. As August comes to a close, September's approach hints at a gradual transition towards the end phase of the wet season, but not without its fair share of heavy rains and potential storms.

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• Hagåtña - August »
  With an average ocean temperature of 85.5°F (29.7°C), August is the month with the warmest seawater in Hagåtña, Guam. In Hagåtña, Guam, during August, the rain falls for 28.9 days and regularly aggregates up to 9.76" (248mm) of precipitation.
• Dededo - August »
  The least humid month in Dededo, Guam, is August, with an average relative humidity of 76%. The warmest period in Dededo falls in July and August, when the average high-temperature reaches 84.7°F (29.3°C).
• Santa Rita - August »
  The least humid month in Santa Rita is August, with an average relative humidity of 76%. The least humid month in Santa Rita is August, with an average relative humidity of 76%.
• Agat - August »
  On the last day of August, in Agat sunrise is at 6:09 am and sunset at 6:33 pm ChST. With an average relative humidity of 76%, August is the least humid month in Agat, Guam.
• Piti - August »
  The month with the warmest seawater in Piti, Guam, is August, with an average ocean temperature of 85.5°F (29.7°C). With an average ocean temperature of 85.5°F (29.7°C), August is the month with the warmest seawater in Piti.
• Talofofo - August »
  With an average relative humidity of 76%, August is the least humid month in Talofofo, Guam. January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index in Talofofo, Guam.
• Inarajan - August »
  August is the least humid month in Inarajan, with an average relative humidity of 76%. January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index in Inarajan, Guam.
• Merizo - August »
  August is the month with the warmest seawater in Merizo, with an average ocean temperature of 85.5°F (29.7°C). August is the month with the warmest seawater in Merizo, with an average ocean temperature of 85.5°F (29.7°C).
• Umatac - August »
  The least humid month in Umatac is August, with an average relative humidity of 76%. The months with the highest UV index in Umatac are January through August, October through December, with an average maximum UV index of 7.
• Guam National Wildlife Refuge - August »
  August is the month with the warmest seawater in Guam National Wildlife Refuge with an average ocean temperature of 85.5°F (29.7°C). August, another wet month in the Guam National Wildlife Refuge, experiences the highest sea temperature of the year at a toasty 85.4°F (29.7°C).