October weather forecast
Hagåtña, GU

As October sets in, the pace starts to gently slow down in Hagåtña. The tropical comfort persists and the showers diminish, allowing more opportunities for outdoor activities and exploration. Despite the intermittent downpours, scoring 8.46" (215mm) of rainfall over 28.7 days, the overall atmosphere remains exhilarating. Against the backdrop of the lush green landscape, October is an ideal time to experience Hagåtña's striking blend of history, culture, and nature.

Temperature

With October's commencement, the average high-temperature in Hagåtña, Guam, hits a still moderately hot 84.4°F (29.1°C), replicating the temperature from the month gone by. Hagåtña's nocturnal October readings average at a still warm 82.6°F (28.1°C), showing little variation from the daytime temperatures.

Heat index

October's heat index is computed to be a sweltering 95°F (35°C). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
One should consider that heat index numbers are for shaded settings and light wind. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is a value derived by merging air temperature with the humidity to convey how the climate feels. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

The months with the highest humidity in Hagåtña are January, March through May, October through December, with an average relative humidity of 78%.

Rainfall

In October, the rain falls for 28.7 days. Throughout October, 8.46" (215mm) of precipitation is accumulated. In Hagåtña, Guam, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Ocean temperature

In October, the average ocean temperature in Hagåtña is 85.1°F (29.5°C).
Note: For activities in the water such as swimming or diving, temperatures from 77°F (25°C) to 84.2°F (29°C) are considered optimal for prolonged enjoyment without discomfort.

Daylight

In Hagåtña, the average length of the day in October is 11h and 50min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:10 pm. On the last day of October, in Hagåtña, sunrise is at 6:14 am and sunset at 5:54 pm ChST.

Sunshine

The average sunshine in October is 6.9h.

UV index

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index, 7 in October, converts into the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Note! The Sun's UV radiation gets intensified with the reflection from sand and water.