August weather forecast
Hagåtña, GU

August rolls in promising hot days, but Hagåtña, Guam offers a pleasant surprise with its moderate tropical climate. Brace for generous rain showers, as this month sees the highest rainfall of the year, amounting to a staggering 9.76" (248mm) over 28.9 days. The city continues to teem with vibrant cultural events and breathtaking natural vistas that never fail to captivate the visiting population.

Temperature

The months of July and August are noted for their peak temperatures, with an average high-temperature of 84.7°F (29.3°C).

Heat index

During August, the heat index is appraised at a fiery hot 95°F (35°C). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

August is the least humid month, with an average relative humidity of 76%.

Rainfall

In Hagåtña, during August, the rain falls for 28.9 days and regularly aggregates up to 9.76" (248mm) of precipitation. In Hagåtña, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Ocean temperature

August is the month with the warmest seawater, with an average ocean temperature of 85.5°F (29.7°C).
Note: Swimming, diving, and other water endeavors at temperatures between 77°F (25°C) and 84.2°F (29°C) are considered enjoyable and satisfying for extended periods without discomfort.

Daylight

In August, the average length of the day is 12h and 34min.
On the first day of August, sunrise is at 6:05 am and sunset at 6:48 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 6:33 pm ChST.

Sunshine

In Hagåtña, the average sunshine in August is 7.6h.

UV index

The months with the highest UV index are January through August, October through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 in August interprets into the following recommendations:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Note! The Sun's UV radiation gets intensified with the reflection from sand and water.