The climate in Saint Helena

Average daytime and nighttime temperatures

All climate diagrams on this page result from the collected data of 2 weather stations.
All data correspond to the average monthly values of the last 20 years.

Back to overview: Saint Helena

Climate zone: The northern part of Saint Helena, Ascension and Tristan da Cunha is located in the equatorial tropics, the southern parts of the country belong geographically to the subtropics.

Several months of the year it is warm to hot at temperatures continuously above 25 degrees centigrade, sometimes up to 28 degrees.
Duration of daylight and sunshine in Saint Helena
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Saint Helena
Rainy days per monthRainy days per month in Saint Helena
Precipitation in mm/dayPrecipitation in Saint Helena
Relative humidity in %Relative humidity in Saint Helena
Absolute humidity in g/m³Absolute humidity in Saint Helena

Temperature records of the last 72 years

The hottest temperature measured from 1950 to August 2022 was reported by the Ascencion Island Airp weather station. In June 2014 the record temperature of 30.1 °C was reported here. The hottest summer from July to September, based on all 3 weather stations in Saint Helena , was recorded in 1975 with an average temperature of 26.6 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 22.5 degrees Celsius.

The coldest day in these 72 years was reported by the weather station Ascencion Island Airp. Here the temperature dropped to 20.2 °C in August 2014. Ascencion Island Airp lies at an altitude of 86 meters above sea level. The coldest winter (January to March) was in 1950 with an average temperature of 16.8 °C. In Saint Helena, it is usual to have about 8.7 degrees more at 25.5 °C for this three-month period.

The most precipitation fell in February 2020. With 11.8 mm per day, the Ascencion Island Airp weather station recorded the highest monthly average of the last 72 years.

Long-term development of temperatures from 1986 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 1 measuring points in order to have actually comparable data over as long a period as possible.

In the years 1986 to 2021 there were only these 1 weather stations in the whole country, which reported continuous temperature values (St Helena). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was March 2019 with 22.4 °C. September 1992 was the coldest month with an average temperature of 15.1 °C.

The average annual temperature was about 18.7 °C in the years after 1986 and about 18.9 °C in the last years before 2021. So it has hardly changed at all in the past 36 years. This trend only applies to the selected 1 weather stations in Saint Helena. A considerably more comprehensive evaluation of the global warming has been provided separately.

Long-term development of temperatures in Saint Helena

Data basis: German Weather Service, individual values averaged and supplemented by own elements.
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