May weather forecast
Hagåtña, GU

May ushers in the city's slight summer surge, humidity levels remain steady and the temperatures creep a little higher. Outdoor enthusiasts can appreciate the city's serene beaches, delicate rainforests, and vibrant festivals during this month. Be prepared for showers as the month is known to receive a substantial amount of rainfall of 3.31" (84mm) over 23.1 days. This combination of gentle summer sun and nourishing rain creates an enriching environment that brings nature to its resplendent display of life.

Temperature

The arrival of May brings an average high-temperature of a still warm 84.2°F (29°C), closely following the temperature pattern of April. Hagåtña's nighttime temperatures in May display a slight drop from daytime highs, averaging to a still warm 82.2°F (27.9°C).

Heat index

For May, the heat index is appraised at a tropical 93.2°F (34°C). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
When referencing the heat index, its values are suitable for shady environments and light breezes. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.

Humidity

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

Rainfall

In Hagåtña, in May, during 23.1 rainfall days, 3.31" (84mm) of precipitation is typically accumulated. In Hagåtña, during the entire year, the rain falls for 288.5 days and collects up to 60.08" (1526mm) of precipitation.

Ocean temperature

In May, the average ocean temperature is 84°F (28.9°C).
Note: For swimming, diving, or other water activities, the temperature range of 77°F (25°C) to 84.2°F (29°C) is perceived as exceptionally enjoyable and comfortable even for prolonged periods.

Daylight

In May, the average length of the day is 12h and 45min.
On the first day of the month, sunrise is at 5:59 am and sunset at 6:36 pm. On the last day of May, sunrise is at 5:52 am and sunset at 6:44 pm ChST.

Sunshine

In May, the average sunshine is 10.5h.

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 reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 7 in May converts into the following recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.