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

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.