May weather forecast
Saint Helena, Ascension and Tristan da Cunha

May, the fifth month of the year, ushers in cooler temperatures and changing precipitation patterns in the islands of Saint Helena, Ascension, and Tristan da Cunha.

In Saint Helena, May is firmly within the autumn season, which is characterised by decreasing temperatures and less rainfall. The temperatures typically range from 17°C (62.6°F) to 25°C (77°F). The rainfall in May is lower compared to April, with the island gradually moving towards its dry season. The capital, Jamestown, experiences similar weather patterns. Transitioning from May to June, both temperature and precipitation are expected to decrease further, marking the onset of winter.

Ascension Island experiences a significant decrease in rainfall in May, signifying the end of its wet season. Despite this, temperatures remain relatively consistent, ranging from 23°C (73.4°F) to 29°C (84.2°F). Georgetown, the primary settlement on Ascension Island, reflects these weather patterns. Moving into June, a further decrease in rainfall can be expected, while temperatures remain steady.

Tristan da Cunha in May sees temperatures ranging between 12°C (53.6°F) and 16°C (60.8°F), marking a significant cooling as the island heads towards winter. Rainfall continues to be high but shows a slight decrease from April. Edinburgh of the Seven Seas, the main settlement, aligns with these weather conditions. The progression from May to June brings further declines in temperatures and a slight decrease in rainfall.

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• Jamestown - May »
  In Jamestown during the entire year, the rain falls for 40.7 days and collects up to 113mm (4.45") of precipitation. In Jamestown during May, the rain falls for 4 days and regularly aggregates up to 18mm (0.71") of precipitation.
• Georgetown - May »
  On the last day of the month, in Georgetown sunrise is at 07:04 and sunset at 18:46 GMT. In Georgetown during the entire year, the rain falls for 166.5 days and collects up to 168mm (6.61") of precipitation.
• Longwood - May »
  Transitioning from April to May, Longwood observes an average high-temperature of a still moderately hot 23.2°C (73.8°F), differing subtly from the previous month. On the first day of May in Longwood, sunrise is at 06:34 and sunset at 18:05.
• Tristan da Cunha - May »
  In Tristan da Cunha in May, the average water temperature is 16°C (60.8°F). In May, the average sea temperature in Tristan da Cunha is 16°C (60.8°F).
• Ascension Island - May »
  The months with the warmest seawater in Ascension Island are March through May, with an average sea temperature of 28°C (82.4°F). On the first day of May in Ascension Island sunrise is at 06:59 and sunset at 18:49.
• Saint Helena Island - May »
  In Saint Helena Island the average seawater temperature in May is 24°C (75.2°F). In May, the average sea temperature in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, is 24°C (75.2°F).