October weather forecast
Umatac, GU

October, like September, in Umatac, Guam, is another warm autumn month, with temperature in the range of an average low of 82.6°F (28.1°C) and an average high of 84.4°F (29.1°C).

Temperature

In Umatac, the average high-temperature in October remains the same as in September - a still warm 84.4°F (29.1°C). The average low-temperature, in Umatac, is 82.6°F (28.1°C).

Heat index

The average heat index in October is calculated to be a sweltering 95°F (35°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like wind, clothing, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

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

Rainfall

In October, in Umatac, the rain falls for 28.7 days. Throughout October, 8.46" (215mm) of precipitation is accumulated. Throughout the year, in Umatac, there are 288.5 rainfall days, and 60.08" (1526mm) of precipitation is accumulated.

Daylight

In Umatac, the average length of the day in October is 11h and 50min.
On the first day of October, sunrise is at 6:10 am and sunset at 6:11 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 5:55 pm ChST.

Sunshine

In Umatac, 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 value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 in October transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.