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

November, the last month of the spring in Ascension Island, is warm month, with an average temperature fluctuating between 28°C (82.4°F) and 22°C (71.6°F).
An excellent water temperature of 25°C (77°F) and only 1 rainfall days, with 4mm (0.16") of accumulated rainfall, makes November a prime for swimming and other water activities.

Temperature

Ascension Island witnesses its lowest temperatures in August through November, reaching an average of 28°C (82.4°F).

Heat index

The average heat index in November is calculated to be a tropical 31°C (87.8°F). With sustained exposure and activity, exhaustion becomes probable, resulting in heat cramps.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', determines the feeling of heat when you account for the relative humidity. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.

Humidity

In November, the average relative humidity is 69%.

Rainfall

January, November and December are months with the least rain when the rain falls for 1 days and typically aggregates up to 4mm (0.16") of rain.

Sea temperature

In November, the average sea temperature is 25°C (77°F).
Note: Water activities in surface temperatures between 25°C (77°F) and 29°C (84.2°F) are seen as exceptional and extremely agreeable for lengthened time spans.

Daylight

In Ascension Island, the average length of the day in November is 12h and 29min.
On the first day of November, sunrise is at 06:29 and sunset at 18:52. On the last day of the month, sunrise is at 06:29 and sunset at 19:02 GMT.

Sunshine

In November, the average sunshine in Ascension Island is 5.3h.

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 reading of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for the average person.
Note: In November, the maximum UV index of 12 translates into these guidelines:
Take all critical precautions, unprotected skin might burn swiftly. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Sunscreen of at least SPF 30 should be applied generously and reapplied often on overcast days, especially post swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.