August weather forecast
Saint Helena, Ascension and Tristan da Cunha

August brings a transitional period to the islands of Saint Helena, Ascension, and Tristan da Cunha, as they move from the peak of winter towards the early onset of spring, with shifts in temperature and precipitation.

In Saint Helena, August sees a slight rise in temperatures compared to July, typically ranging from 14°C (57.2°F) to 22°C (71.6°F), signalling the gradual end of winter. Rainfall also increases slightly, marking the end of the dry season. The capital, Jamestown, experiences these weather patterns. As the island transitions from August to September, both temperatures and rainfall are expected to increase further, indicating the onset of spring.

On Ascension Island, August experiences a minor increase in temperatures, ranging from 22°C (71.6°F) to 29°C (84.2°F). Rainfall also starts to increase, marking the end of the dry season. Georgetown, the island's main settlement, mirrors these weather conditions. Moving into September, there is an expected increase in both temperature and rainfall as the island heads towards the wet season.

Tristan da Cunha in August experiences slightly warmer temperatures than in July, typically fluctuating between 11°C (51.8°F) and 15°C (59°F). Rainfall increases slightly compared to July, marking a departure from the peak winter season. The weather in the main settlement, Edinburgh of the Seven Seas, aligns with this pattern. As the island moves from August to September, a further rise in both temperatures and rainfall can be expected, indicating the arrival of the spring season.

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• Jamestown - August »
  In Jamestown during August, the rain falls for 3 days and regularly aggregates up to 10mm (0.39") of precipitation. In Jamestown, in August, during 3 rainfall days, 10mm (0.39") of precipitation is typically accumulated.
• Georgetown - August »
  In Georgetown in August, it is raining for 19.8 days, with typically 19mm (0.75") of accumulated precipitation. In Georgetown, Saint Helena, Ascension and Tristan da Cunha, in August, it is raining for 19.8 days, with typically 19mm (0.75") of accumulated precipitation.
• Longwood - August »
  In Longwood, Saint Helena, Ascension and Tristan da Cunha, the average sunshine duration in August is 4.6h. The average relative humidity in August in Longwood is 77%.
• Tristan da Cunha - August »
  In Tristan da Cunha during August, the rain falls for 26 days and regularly aggregates up to 175mm (6.89") of precipitation. The months with the coldest seawater in Tristan da Cunha are August and September, with an average sea temperature of 13°C (55.4°F).
• Ascension Island - August »
  On the first day of August in Ascension Island sunrise is at 07:10 and sunset at 18:57. In Ascension Island the average seawater temperature in August is 25°C (77°F).
• Saint Helena Island - August »
  In Saint Helena Island the average seawater temperature in August is 21°C (69.8°F). In Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, in August, during 15 rainfall days, 68mm (2.68") of precipitation is typically accumulated.