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The climate of Saint Helena, Ascension and Tristan da Cunha (United Kingdom)
Saint Helena, Ascension and Tristan da Cunha are located in the south Atlantic Ocean far from the coast of Africa. These three islands and the smaller islands of Tristan da Cunha are British overseas territories. The capital of these islands is Jamestown which is located on the islands of Saint Helena. The smaller islands that are part of Tristan da Cunha are: Gough, Inaccessible and the Nightingale Islands which are all uninhabited. Saint Helena is known for the fact that Napoleon Bonaparte spent his last days here in exile. The islands have a total population of about 6,000, most of which live on Saint Helena. Because the islands have no airport the inhabitants solely depend on ships. The islands used to be an important stop over for navigation to and from South East Asia. The long journey was interrupted by a stopover on these islands to stock up supplies and fresh drinking water. In the 17th century Saint Helena was claimed by the Dutch for several years.

All of the islands have a maritime climate varying from a tropical to a moderate maritime climate. the climate on most of the islands is influenced by the trade wind. Temperatures on Saint Helena are much higher than on Tristan da Cunha on average. Trade winds seem to be colder here as well. Precipitation figures are not far apart. Ascension is situated more to the north than the other islands; trade winds have a smaller influence here. Precipitation figures are much lower here as well. It is even dry on Ascension.


Climate figures
The figures below are based on long term weather and climate records. They are an average for Saint Helena. Because of the large distance the figures do not apply to Ascension and Tristan da Cunha.

temperature (°C)


temperature (°C)
hours of sunshine

average days with precipitation
per month
per month
temperature (°C)
January 22 18 8 14 21
February 23 18 9 14 22
March 23 19 8 15 22
April 22 18 7 15 22
May 21 17 6 14 22
June 19 16 6 16 21
July 18 15 6 16 20
August 17 14 6 15 18
September 18 15 6 12 18
October 18 14 6 14 18
November 19 15 7 13 18
December 20 16 8 12 19
= 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 tables are useful but they don’t give an overall picture of the climate and possible weather conditions during a period of time. How high the chances are of hot or cold weather or hurricanes can often not be found in these tables. This is why we offer extra climate information per month. The figures below are for Saint Helena. Because of the large distance the figures do not apply to Ascension and Tristan da Cunha.

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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