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The climate of American Samoa
In Oceania lies American Samoa, an overseas territory of the United States of America. American Samoa is also described as Eastern Samoa, which has to do with the fact that the territory, together with sovereign Samoa, formed one country. Therefore the Independent State of Samoa is regularly described by Americans as Western Samoa. American Samoa has a tropical rainforest climate (type Af according to the Köppen climate classification), of which a fairly high air humidity, regular rain showers and a rather constant temperature are the most important factors. The average maximum temperature is around thirty degrees practically throughout the year. After sunset the temperature slowly drops to finally end with a lowest 24 hour temperature of approximately 22 to 25 degrees centigrade.


With an average of ample three-thousand millimeters of rain American Samoa can be called fairly wet. American Samoa has a distinct wetter season lasting from the end of October up to and including May. The months of June, July, August and September are somewhat drier, although also in these months there is an obvious chance of rain-showers . Rain-showers in American Samoa often fall unexpectedly and can be very heavy. They are also often of very short duration. Therefore it is advisable to always have an umbrella with you if you go for a walk, unless you do not mind getting wet.

American Samoa lies in a zone where heavy tropical storms may occur. These hurricanes, locally called cyclones, may particularly develop in the months of January, February, March and April. In the months limiting the hurricane season, December and May, the chance of this is already considerably smaller. A cyclone that caused a substantial amount of damage is Val, which struck already early in the hurricane season 1991/1992. In the beginning of December Val caused damage in American Samoa running into an estimated 200 million US dollar.


Climate figures
The figures below are based on registered long-term weather information and go for the whole of American Samoa.
(locally slight deviations may occur).

temperature (°C)


temperature (°C)
hours of sunshine

average days with precipitation
per month
per month
temperature (°C)
January 30 24 5 19 29
February 30 24 5 16 29
March 30 24 5 18 29
April 30 24 5 14 29
May 29 24 5 10 29
June 29 23 4 7 28
July 29 23 5 6 28
August 29 23 6 7 27
September 29 23 6 9 27
October 29 23 5 11 28
November 30 24 5 12 28
December 30 25 5 15 29
= 0-5 mm ● = 6-30 mm ● = 31-60 mm ● = 61-100 mm ● = 101-200 mm ● = over 200 mm
= 0-0.2 inches ● = 0.2-1.2 inches ● = 1.2-2.4 inches ● = 2.5-4 inches ● = 4.1-8 inches ● = over 8 inches

More climate information
Climate figures come in handy but do not offer an overall picture of the climate and the possible weather conditions within a particular period. You cannot often find in figures how big the chance is of wintry weather, (extreme) heat or hurricanes. Therefore we monthly offer useful extra climate information:

chance of
(very) hot


chance of
(very) cool
chance of

chance of
chance of
sunny days


click here for the explanation of the symbols


The information at this site was carefully composed from climate data collected by meteorological services, meteorological offices, climate experts and other sources. “More climate info” is based on statistics, climate data and personal experience. No rights can be derived from this site. Weather has no memory and gives no guaranties. Nothing is as changeable and unpredictable as the weather. The authors of this site feel in no way responsible for any damages caused by misinterpretation or other circumstances that may influence your holiday or trip to a certain destination. We provide information, it’s up to the reader to use it to it’s benefit.


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