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

As April strides in, the weather becomes marginally cooler with temperatures dipping slightly. Rainfall significantly escalates, peaking at 33mm (1.3"), becoming the rainiest month of the year in Ascension Island. From gentle drizzles to abrupt showers, the month has it all, creating a nature enthusiast's dream scenery. The moisture restores life to the flora, painting the island in various shades of green. As May approaches, the Island witnesses a noticeable decrement in rainfall amounts.

Temperature

In Ascension Island, the months of February through May are known for the peak temperatures, reaching an average high of 31°C (87.8°F).

Heat index

The average heat index in April is calculated to be a very hot 37°C (98.6°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

In Ascension Island, the average relative humidity in April is 69%.

Rainfall

April is the month with the most rainfall. Rain falls for 4 days and accumulates 33mm (1.3") of precipitation.

Sea temperature

The months with the warmest seawater are March through May, with an average sea temperature of 28°C (82.4°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and other activities, ensuring comfort and enjoyment for lengthened periods.

Daylight

In April, the average length of the day is 11h and 56min.
On the first day of April, sunrise is at 07:00 and sunset at 19:01. On the last day of the month, sunrise is at 06:59 and sunset at 18:49 GMT.

Sunshine

March and April, with an average of 8.9h of sunshine, are months with the most sunshine in Ascension Island.

UV index

January through April, September through December, with an average maximum UV index of 12, are months with the highest UV index in Ascension Island. A UV Index estimate of 11, and higher, represents an extreme health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In April, the UV index of 12 transforms into the following advice:
Implement every essential safety step. Individuals with fair skin might receive burns in less than 5 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Applying and reapplying a broad-spectrum sunscreen with a minimum SPF 30 after every two hours, outdoor workout, or swim is recommended. Be wary! Reflections from sand and water make UV radiation more intense.