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

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Weather in May

Embracing Ascension Island in May means welcoming a subtle change in weather. Peak temperatures remain constant at 31°C (87.8°F), while rainfall levels drop to 16mm (0.63"), inviting more clear days. Verdant landscapes left behind by April rainfall continue to flourish under the warm sun rays. Fewer rain clouds mark the skies and sunny days dominate, great for touring the island. Heading into June, a further decrease in rainfall can be anticipated.

Temperature

Temperatures in Ascension Island reach their maximum during February through May, recording an average high-temperature of 31°C (87.8°F).

Heat index

In May, the heat index is calculated to be a torrid 37°C (98.6°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

The average relative humidity in May in Ascension Island is 68%.

Rainfall

In May, in Ascension Island, the rain falls for 3 days. Throughout May, 16mm (0.63") of precipitation is accumulated. Throughout the year, there are 30 rainfall days, and 142mm (5.59") of precipitation is accumulated.

Sea temperature

March through May, with an average sea temperature of 28°C (82.4°F), are months with the warmest seawater in Ascension Island.
Note: In water temperatures ranging between 25°C (77°F) and 29°C (84.2°F), activities such as swimming and diving become highly pleasurable for long durations.

Daylight

The average length of the day in May is 11h and 45min.
On the first day of May in Ascension Island, sunrise is at 06:59 and sunset at 18:49. On the last day of the month, sunrise is at 07:04 and sunset at 18:45 GMT.

Sunshine

In Ascension Island, the average sunshine in May is 8.5h.

UV index

In Ascension Island, Saint Helena, Ascension and Tristan da Cunha, the average daily maximum UV index in May is 11. A UV Index reading of 11, and higher, represents an extreme health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high daily UV index of 11 during May translates into the following directions:
Enforce every key safety measure. Those with light skin might get burns in a matter of minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Apply generously and frequently reapply a sunscreen with SPF 30 or more even on cloudy days, particularly after a swim or outdoor exercise. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.

Frequently asked questions

What time of the year is the hottest in Ascension Island?

Ascension Island sees its peak of temperatures during February through May, with an average high-temperature of 31°C (87.8°F).

Is it hot in Ascension Island during May?

In May, in Ascension Island, the average high-temperature is 31°C (87.8°F), and the average low-temperature is 24°C (75.2°F). In May, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 37°C (98.6°F).

What is the average humidity in May in Ascension Island?

In Ascension Island, Saint Helena, Ascension and Tristan da Cunha, the average relative humidity in May is 68%.

How much does it rain in Ascension Island in May?

In Ascension Island, in May, during 3 rainfall days, 16mm (0.63") of precipitation is typically accumulated.

What are the months with the warmest sea water in Ascension Island?

The months with the warmest seawater in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, are March through May, with an average sea temperature of 28°C (82.4°F).

What is the sea water temperature in May in Ascension Island?

In Ascension Island, Saint Helena, Ascension and Tristan da Cunha, the average seawater temperature in May is 28°C (82.4°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in May in Ascension Island?

In May, the average day length in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, is 11h and 45min.

When are sunrise and sunset in May in Ascension Island?

On the first day of May in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, sunrise is at 06:59 and sunset at 18:49. On the last day of the month, sunrise is at 07:04 and sunset at 18:45 GMT.

How many hours of sunshine does Ascension Island have in May?

In May, the average sunshine duration in Ascension Island is 8.5h.

What is the UV index reading in May in Ascension Island?

The average daily maximum UV index in May in Ascension Island is 11. A UV Index reading of 11, and higher, represents an ultimate hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

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

Average temperature in May - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in May: 31°C

The warmest months (with the highest average high temperature) are February, March, April and May (31°C).
The months with the lowest average high temperature are August, September, October and November (28°C).

  • Average low temperature in May: 24°C

The months with the highest average low temperature are March, April and May (24°C).
The coldest months (with the lowest average low temperature) are July, August, September, October, November and December (22°C).

Average humidity in May
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average humidity in May - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average humidity in May: 68%

The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is July (67%).

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

Average rainfall in May - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in May: 16mm

The wettest month (with the highest rainfall) is April (33mm).
The driest months (with the least rainfall) are January, November and December (4mm).

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

Average rainfall days in May - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall days in May: 3 days

The month with the highest number of rainy days is April (4 days).
The months with the least rainy days are November and December (1 days).

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

Average sea temperature in May - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average sea temperature in May: 28°C

The best months for swimming (with the highest average sea temperature) are March, April and May (28°C).
The coldest months (with the lowest average sea temperature) are September and October (24°C).

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

Average daylight in May / Average sunshine in May - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in May: 11h and 5min

The month with the longest days is December (Average daylight: 12h and 36min).
The month with the shortest days is June (Average daylight: 11h and 42min).

  • Average sunshine in May: 8h and 3min

The months with the most sunshine are March and April (Average sunshine: 8h and 54min).
The month with the least sunshine is October (Average sunshine: 5h and 12min).

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

Average UV index in May - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average UV index in May: 11

The months with the highest UV index are January, February, March, April, September, October, November and December (UV index 12).
The months with the lowest UV index are June and July (UV index 9).

Ascension Island, Saint Helena, Ascension and Tristan da Cunha

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