October weather forecast
Umatac, GU

October in Umatac, Guam indicates a retreat in rainfall, tapering off to 8.46" (215mm) in a minor step down from September. Despite this decrease, October retains its place in the rainy season procession. The cloud percentage continues to dominate, which in collaboration with tempered wind speeds, gives rise to a subdued tropical mood. In the fleeting daylight hours, the persisting UV index stands as a reminder of the need for sun safety even on overcast days.

Temperature

The dawn of October in Umatac registers an average high temperature of a still warm 84.4°F (29.1°C), nearly the same as the a moderately hot 84.4°F (29.1°C) observed in September. Nighttime temperatures in Umatac during October report a consistent average of 82.6°F (28.1°C).

Heat index

During October, the heat index is computed to be a sweltering 95°F (35°C). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Remember that heat index calculations are made for conditions in the shade with light wind. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', marries air temperature and humidity to produce a value illustrating perceived warmth. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

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

Rainfall

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

Daylight

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 6:15 am and sunset at 5:54 pm ChST.

Sunshine

The average sunshine in October is 6.9h.

UV index

The months with the highest UV index in Umatac 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 vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In October, a daily UV index of 7 turns into the following recommendations:
Prevent overexposure. Protection from the sun's harmful effects is needed. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.