May weather forecast
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

May introduces the onset of a chilly atmosphere as Tristan da Cunha steps into the comfort of cooler months. Sea temperatures continue to drop further, coinciding with the falling atmospheric temperatures. A rise in rainfall up to 155mm (6.1") is a poignant characteristic of this month's weather. May becomes the preamble to the frosty winters ahead, with a marked shift in all elemental parameters. The dripping sunshine hours and lowering UV index proclaim the advancing arrival of winter in the area.

Temperature

With the onset of May in Tristan da Cunha, a modest change to a still enjoyable 17°C (62.6°F) from April's 18°C (64.4°F) is noted in high-temperature. Tristan da Cunha's evenings during May maintain an average temperature of 13°C (55.4°F), aligning closely with the daytime temperatures.

Rainfall

In May, the rain falls for 23 days. Throughout May, 155mm (6.1") of precipitation is accumulated. In Tristan da Cunha, during the entire year, the rain falls for 251 days and collects up to 1681mm (66.18") of precipitation.

Sea temperature

In May, the average sea temperature in Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, is 16°C (60.8°F).
Note: Swimming is not an enjoyable activity for the majority when the water is at 16°C (60.8°F). The difficulty of controlling breathing increases as the temperature dips from 21°C (69.8°F) to 15°C (59°F).

Daylight

In May, the average length of the day is 10h and 8min.
On the first day of May, sunrise is at 07:29 and sunset at 18:02. On the last day of the month, sunrise is at 07:53 and sunset at 17:40 GMT.

Sunshine

The average sunshine in May in Tristan da Cunha is 3.5h.

UV index

In May, the average daily maximum UV index in Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In May, a daily maximum UV index of 3 leads to the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.