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Climate - American Samoa


Average weather, temperature, rainfall, sunshine

Flag - American Samoa

Map - American Samoa

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In American Samoa, an archipelago in the Pacific Ocean located south of the Equator and a non-incorporated territory of the United States, the climate is hot, humid and rainy throughout the year, with a maximum in rainfall from December to March and a relative minimum from June to September.
Temperatures are stable, with little variations between the hottest period (December to April), when highs are about 31 °C (88 °F), and the coolest period (June to August), when they are around 29 °C (84 °F). Night temperatures are almost always above 20 °C (68 °F). The south-east trade winds blow steadily throughout the year, especially from May to October, and are stronger during the day, making the heat more bearable.
Rainfall occurs in the form of downpours or thunderstorms, which are usually intense but don't last long, in fact, the sun shines quite frequently and regularly, even in the rainiest months. From December to March, however, the rains can sometimes last for the whole day.
Rainfall is enhanced by the elevations that are found on the volcanic islands (Tutuila, Ta'u, Ofu, and Olosega), which are therefore wetter, while the small islands and the flat atolls (Aunu'u, Swains, and Rose) receive less rainfall, about 2,500 millimeters (100 inches) per year. On the volcanic islands, the amount of rainfall varies depending on slope exposure, in fact, it is around 3,000 mm (120 in) per year along the sheltered coasts and around 4,000 mm (160 in) on the coasts exposed to the trade winds; in hilly and mountainous areas, it can even exceed 5,000 mm (200 in) per year.

Pago Pago

Climate chart - Pago Pago

In Pago Pago, the capital, located at 14 degrees south latitude, on the north side of the main island, Tutuila, the average daily temperature ranges from 28.5 °C (83.3 °F) in March to 27.2 °C (80.9 °F) in July and August. The temperature almost never drops below 20 °C (68 °F): the last time was in July 2014, when it dropped to 19 °C (66 °F). On the hottest days, the temperature typically reaches 33 °C (961.5 °F) from January to March, however, in El Niño periods, it can reach 35 °C (95 °F), as happened in the first months of 1998 and in February 2016.
Here are the average temperatures.
Pago Pago - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January263128.4788883
February263128.4788883.2
March263128.5788883.3
April263128.3788882.9
May263027.9788782.2
June253027.5788581.5
July252927.2778580.9
August252927.2778580.9
September253027.6788681.6
October253027.8788682
November263128.1788782.6
December263128.3788882.9
Year25.530.427.8577.986.682

In Pago Pago, 3,250 mm (128 in) of rain fall per year, with a maximum of more than 350 mm (13.8 in) from December to February and a minimum of less than 200 mm (8 in) between June and August. Here is the average precipitation.
Pago Pago - Average precipitation
MonthMillimetersInchesDays
January38515.224
February35013.822
March2801124
April28511.222
May30011.821
June1606.319
July1907.520
August1756.919
September2058.118
October26010.221
November3051221
December36514.424
Year3260128.3256

In Pago Pago, the sun does not shine very often, just 1,850 hours a year. The sunniest months are March, August and September.
Pago Pago - Sunshine hours
MonthAverageTotal
January5.5165
February5.5150
March6180
April4.5130
May4125
June4115
July5150
August5.5170
September6.5195
October5160
November5155
December5155
Year5.11850

The sea in American Samoa is warm enough to swim in all year round, as you can see in the following table.
Pago Pago - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January2984
February2985
March2985
April2985
May2984
June2883
July2882
August2882
September2882
October2883
November2983
December2984
Year28.683.5

Pago Pago

Tropical cyclones



American Samoa is exposed to the tropical cyclones of the South Pacific. Cyclones are usually formed from November to mid-May, though they are most likely from late December to early April. Outside of this period, there has been cyclone Keli, in June 1997.

When to go and what to pack in American Samoa

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