October weather forecast
Piti, GU

In October, Piti residents and visitors experience a slight cool down in comparison to September with temperatures falling gently. Though temperatures remain pleasant, there is a significant decrease in rainfall from September to October. Heading into November, there is a promise of lesser rain and the slow but sure advent of cooler weather. October's standout is undeniably the significant drop in average rainfall amounting to 8.46" (215mm).

Temperature

Piti welcomes October with a high-temperature average of a still moderately hot 84.4°F (29.1°C), corresponding to the preceding month. In Piti, October nights maintain a consistent temperature, with an average low of 82.6°F (28.1°C).

Heat index

October's mean heat index is computed to be a fiery hot 95°F (35°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

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

Rainfall

In Piti, in October, it is raining for 28.7 days, with typically 8.46" (215mm) of accumulated precipitation. Throughout the year, there are 288.5 rainfall days, and 60.08" (1526mm) of precipitation is accumulated.

Ocean temperature

In Piti, in October, the average water temperature is 85.1°F (29.5°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) provides warmth and pleasure, making water activities enjoyable for lengthened periods without feeling uncomfortable.

Daylight

In Piti, Guam, 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 6:11 pm. On the last day of October, in Piti, sunrise is at 6:15 am and sunset at 5:54 pm ChST.

Sunshine

In Piti, the average sunshine in October is 6.9h.

UV index

The months with the highest UV index in Piti are January through August, October through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 7 during October leads to these instructions:
Guard oneself from overexposure. Defence against sun injury is vital. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Attention! The reflection of both water and sand can increase the intensity of UV rays.