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

October, the same as September, is another warm spring month in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, with an average temperature fluctuating between 22°C (71.6°F) and 28°C (82.4°F).

Temperature

The coldest months are August through November, with an average high-temperature of 28°C (82.4°F).

Heat index

The average heat index in October is appraised at a hot 30.5°C (86.9°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, pregnancy, wind, and clothing affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in October is 69%.

Rainfall

In Ascension Island, Saint Helena, Ascension and Tristan da Cunha, in October, it is raining for 3 days, with typically 7mm (0.28") of accumulated precipitation. Throughout the year, there are 30 rainfall days, and 142mm (5.59") of precipitation is accumulated.

Sea temperature

September and October, with an average sea temperature of 24°C (75.2°F), are months with the coldest seawater in Ascension Island, Saint Helena, Ascension and Tristan da Cunha.
Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 24°C (75.2°F).

Daylight

In Ascension Island, the average length of the day in October is 12h and 17min.
On the first day of October in Ascension Island, sunrise is at 06:41 and sunset at 18:52. On the last day of the month, sunrise is at 06:29 and sunset at 18:52 GMT.

Sunshine

With an average of 5.2h of sunshine, October has the least sunshine of the year.

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 value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 12 in October transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Prolonged stay under the direct sun should be avoided as much as possible, especially if a person burns easily. Sunscreen with a minimum 30 sun protection factor should always be used. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.