May weather forecastSan Guillermo, Philippines

Weather in May

May, the last month of the spring in San Guillermo, is another hot month, with an average temperature ranging between min 22.7°C (72.9°F) and max 31.9°C (89.4°F).

Temperature

The arrival of May brings an average high-temperature of a still tropical 31.9°C (89.4°F), nearly identical to April's 30.8°C (87.4°F). An average nighttime temperature of 22.7°C (72.9°F) is observed during May.

Heat index

In May, the heat index is calculated to be a blistering 43°C (109.4°F). Careful: Heat exhaustion and heat cramps are anticipated. With ongoing exertion, heatstroke becomes a possibility.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. 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.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

May and June, with an average relative humidity of 78%, are the least humid months.

Rainfall

In San Guillermo, in May, during 21.1 rainfall days, 89mm (3.5") of precipitation is typically accumulated. Throughout the year, there are 222.7 rainfall days, and 872mm (34.33") of precipitation is accumulated.

Daylight

In May, the average length of the day is 12h and 55min.
On the first day of the month, sunrise is at 5:26 am and sunset at 6:11 pm. On the last day of May, sunrise is at 5:18 am and sunset at 6:21 pm PST.

Sunshine

The average sunshine in May is 10.9h.

UV index

The months with the highest UV index are April through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 in May interprets into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.