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

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Weather in May

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.

Frequently asked questions

What are May temperatures in Tristan da Cunha?

The high-temperature, in May, in Tristan da Cunha, records 17°C (62.6°F), while the low-temperature is 13°C (55.4°F).

How much does it rain in Tristan da Cunha in May?

In May, the rain falls for 23 days. Throughout May, 155mm (6.1") of precipitation is accumulated.

What is the sea water temperature in May in Tristan da Cunha?

In Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, in May, the average water temperature is 16°C (60.8°F). For swimming, a surface water temperature of 16°C (60.8°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the average length of the day in May in Tristan da Cunha?

In May, the average day length is 10h and 8min.

When is the sunrise / sunset in May in Tristan da Cunha?

On the first day of May in Tristan da Cunha, 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.

How many hours of sunshine does Tristan da Cunha have in May?

In Tristan da Cunha, the average sunshine duration in May is 3.5h.

What is the UV index intensity in May in Tristan da Cunha?

In May, the average daily maximum UV index in Tristan da Cunha is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

Average temperature in May - Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in May: 17°C

The warmest month (with the highest average high temperature) is February (21°C).
The months with the lowest average high temperature are July, August and September (14°C).

  • Average low temperature in May: 13°C

The month with the highest average low temperature is February (17°C).
The coldest months (with the lowest average low temperature) are August and September (10°C).

Average rainfall in May
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

Average rainfall in May - Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in May: 155mm

The wettest month (with the highest rainfall) is August (175mm).
The driest month (with the least rainfall) is January (93mm).

Average rainfall days in May
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

Average rainfall days in May - Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall days in May: 23 days

The month with the highest number of rainy days is August (26 days).
The month with the least rainy days is February (16 days).

Average sea temperature in May
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

Average sea temperature in May - Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
  • Average sea temperature in May: 16°C

The best months for swimming (with the highest average sea temperature) are February and March (18°C).
The coldest months (with the lowest average sea temperature) are August and September (13°C).

Average daylight in May /
Average sunshine in May
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

Average daylight in May / Average sunshine in May - Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in May: 10h and 1min

The month with the longest days is December (Average daylight: 14h and 42min).
The month with the shortest days is June (Average daylight: 9h and 42min).

  • Average sunshine in May: 3h and 3min

The month with the most sunshine is February (Average sunshine: 5h and 6min).
The month with the least sunshine is June (Average sunshine: 3h and 18min).

Average UV index in May
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

Average UV index in May - Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
  • Average UV index in May: 3

The month with the highest UV index is January (UV index 12).
The months with the lowest UV index are June and July (UV index 2).

Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha

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