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

In October, the shift in Umatac's meteorological conditions is hardly detectable, with high temperatures identical to those of September. Throughout October, Umatac observes a steady low-temperature average of 82.6°F (28.1°C), reflecting a minor dip from daytime highs.

Heat index

The heat index value for October is estimated at a torrid 95°F (35°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

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. Throughout the year, 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 6:15 am and sunset at 5:54 pm ChST.

Sunshine

In October, the average sunshine is 6.9h.

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 vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 7 in October translates into these instructions:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.