May weather forecast and climate
Hagåtña, GU

Weather in May

May, the last month of the spring, in Hagåtña, is another warm month, with average temperature ranging between max 84.2°F (29°C) and min 82.2°F (27.9°C).

Temperature

In Hagåtña, the average high-temperature is practically the same as in April - a still moderately hot 84.2°F (29°C). The average low-temperature, is 82.2°F (27.9°C).

Heat index

The average heat index in May is evaluated at a hot 93.7°F (34.3°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, differences in body mass, height, and shape, metabolic differences, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

January, March through May, October through December, with an average relative humidity of 78%, are most humid months.

Rainfall

In May, in Hagåtña, the rain falls for 23.1 days. Throughout May, 3.31" (84mm) of precipitation is 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 in Hagåtña is 84°F (28.9°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In May, the average length of the day is 12.8h.

Sunshine

In May, the average sunshine in Hagåtña is 10.5h.

UV index

Months with the highest UV index are January through August, October through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in May in Hagåtña?

The average high-temperature, in May, in Hagåtña, Guam, is 84.2°F (29°C), while the average low-temperature is 82.2°F (27.9°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that calculates temperature value influenced by the moisture in the air, in May is calculated to 93.7°F (34.3°C).

What are the most humid months in Hagåtña?

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

What is the average humidity in May in Hagåtña?

In May, the average relative humidity in Hagåtña is 78%.

How many days does it rain in May in Hagåtña?

In Hagåtña, Guam, in May, during 23.1 rainfall days, 3.31" (84mm) of precipitation is typically accumulated.

How warm is the water in May in Hagåtña?

In Hagåtña, Guam, the average seawater temperature in May is 84°F (28.9°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Hagåtña have in May?

The average length of the day in May in Hagåtña is 12.8h.

How many hours of sunshine does Hagåtña have in May?

In May, the average sunshine in Hagåtña is 10.5h.

What is the month with the highest UV index in Hagåtña?

January through August, October through December, with an average maximum UV index of 7, are months with the highest UV index.

How high is the UV index in May in Hagåtña?

In Hagåtña, the average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays.

Average temperature in May
Hagåtña, GU

Average temperature in May - Hagåtña, GU
  • Average high temperature in May: 84.2°F

The warmest months (with the highest average high temperature) are July and August (84.7°F).
The month with the lowest average high temperature is February (81.7°F).

  • Average low temperature in May: 82.2°F

The month with the highest average low temperature is June (83.3°F).
The coldest month (with the lowest average low temperature) is February (79.7°F).

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Average pressure in May
Hagåtña, GU

Average pressure in May - Hagåtña, GU
  • Average pressure in May: 29.85"

The month with the highest atmospheric pressure is February (29.88").
Months with the lowest atmospheric pressure are August, September and October (29.79").

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Average wind speed in May
Hagåtña, GU

Average wind speed in May - Hagåtña, GU
  • Average wind speed in May: 11.7mph

The windiest month (with the highest average wind speed) is February (16.3mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).

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Average humidity in May
Hagåtña, GU

Average humidity in May - Hagåtña, GU
  • Average humidity in May: 78%

Months with the highest relative humidity are January, March, April, May, October, November and December (78%).
The month with the lowest relative humidity is August (76%).

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Average rainfall in May
Hagåtña, GU

Average rainfall in May - Hagåtña, GU
  • Average rainfall in May: 3.31"

The wettest month (with the highest rainfall) is September (10.28").
The driest month (with the least rainfall) is March (1.81").

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Average rainfall days in May
Hagåtña, GU

Average rainfall days in May - Hagåtña, GU
  • Average rainfall days in May: 23.1 days

Months with the highest number of rainy days are July and August (28.9 days).
The month with the least rainy days is February (17.5 days).

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Average sea temperature in May
Hagåtña, GU

Average sea temperature in May - Hagåtña, GU
  • Average sea temperature in May: 84°F

The best month for swimming (with the highest average sea temperature) is August (85.4°F).
The coldest month (with the lowest average sea temperature) is February (82°F).

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Average daylight in May /
Average sunshine in May
Hagåtña, GU

Average daylight in May / Average sunshine in May - Hagåtña, GU
  • Average daylight in May: 12.8h

The month with the longest days is June (Average daylight: 12.9h).
The month with the shortest days is December (Average daylight: 11.3h).

  • Average sunshine in May: 10.5h

The month with the most sunshine is June (Average sunshine: 10.6h).
The month with the least sunshine is November (Average sunshine: 6.3h).

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Average sunshine days in May
Hagåtña, GU

Average sunshine days in May - Hagåtña, GU
  • Average sunshine days in May: 4.3 days

The month with the most sunshine days is March (6.6 days).
The month with the least sunshine days is September (1.1 days).

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Average UV index in May
Hagåtña, GU

Average UV index in May - Hagåtña, GU
  • Average UV index in May: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).

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Average cloud cover in May
Hagåtña, GU

Average cloud cover in May - Hagåtña, GU
  • Average cloud cover in May: 39

Months with the most cloud cover are January, August and October (Cloud cover 46).
Months with the least cloud cover are May and June (Cloud cover 39).

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Average visibility in May
Hagåtña, GU

Average visibility in May - Hagåtña, GU
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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