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Climate - Guam


Average weather, temperature, rainfall, when to go, what to pack

Flag - Guam

Map - Guam


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In Guam, the climate is tropical, hot and humid all year round. Guam is an island administered by the United States and located in the western Pacific Ocean between the Equator and the Tropic of Cancer; geographically, it is part of Micronesia.
Temperatures are very stable, and are around 30/32 °C (86/90 °F) during the day and 24/25 °C (75/77 °F) at night, all year round. Here are the average temperatures in Tamuning.
Tamuning - Average temperatures
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January243027758680.6
February243027758680.6
March243027758680.6
April253128778882.4
May253128778882.4
June253128778882.4
July253128778882.4
August253128778882.4
September253128778882.4
October253128778882.4
November253027.5778681.5
December253027.5778681.5
Year24.830.627.676.687.181.5

The rainfall is abundant, above 2,000 millimeters (80 inches) per year; the rainiest period is from July to November, while the driest one is from January to April, when, however, there is still a moderate amount of showers and thunderstorms. Here is the average precipitation.
Tamuning - Average precipitation
MonthMillimetersInchesDays
January1154.519
February903.516
March652.617
April853.317
May1254.919
June1606.322
July26510.425
August36514.425
September34013.424
October31012.225
November2158.523
December1405.522
Year227589.6254

The amount of sunshine in Guam is not excellent, though it is acceptable or good from January to June; from July to December, during the wettest period, it is quite scarce. Here are the average sunshine hours per day.
Tamuning - Sunshine hours
MonthAverageTotal
January5.5175
February6.5185
March7215
April7215
May7220
June6.5195
July5155
August4.5145
September4.5130
October4.5135
November4.5135
December4.5145
Year5.62050

Guam

Guam's sea is warm enough to swim in all year round, as can be seen in the following table.
Tamuning - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January2882
February2882
March2882
April2882
May2984
June2984
July2984
August2984
September2984
October2984
November2984
December2882
Year28.683.5

Tropical cyclones



The island lies in the path of typhoons, the tropical cyclones of Southeast Asia and the Philippine Sea. Typhoons can cause more or less serious damage, bringing heavy rains and strong winds, and normally occur from May to December, though they are more frequent from August to November. Sometimes, however, they have affected the island outside of this period, as happened with typhoon Roy (in January 1988), Isa (in April 1997), and Kong-rey (not strong, in April 2007).

Best Time



The best time to travel to Guam is from February to April, since it is the least rainy period of the year, and (normally) outside of the typhoon season.

What to pack



All year round, bring light clothes of natural fibers, a sun hat, a scarf for the breeze, a light sweatshirt for the evening, and a light raincoat or umbrella.
When going to the reef, you can bring snorkeling equipment, including water shoes or rubber-soled shoes.



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