August weather forecast
Umatac, GU

Come August, Umatac, Guam endures its wettest episode with rainfall peaking at a high of 9.76" (248mm), slightly above what is recorded in July. The high rainfall makes this month a prominent part of the rainy season. However, the city's climate offsets the high precipitation with decreased wind speed. The cloud cover adds an element of serenity to the weather story of the month. Concurrently, the UV index remains steady, advocating for continual sun safety measures.

Temperature

July and August, when the average high-temperature reaches 84.7°F (29.3°C), are the warmest months.

Heat index

The heat index value for August is computed to be a sweltering 95°F (35°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'apparent temperature', offers an insight into how hot it feels when we factor in moisture content. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. 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 remain especially vital for babies and toddlers. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

August is the least humid month, with an average relative humidity of 76%.

Rainfall

In Umatac, during August, the rain falls for 28.9 days and regularly aggregates up to 9.76" (248mm) of precipitation. 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 August is 12h and 34min.
On the first day of August, sunrise is at 6:06 am and sunset at 6:48 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 6:33 pm ChST.

Sunshine

In August, the average sunshine is 7.6h.

UV index

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index in Umatac, Guam. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 7 in August translates into these instructions:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.