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

October arrives carrying ample sunlight, averaging about 5.2h of sunshine each day. The temperature remains constant around 28°C (82.4°F), marking stable conditions. Rainfall further recedes to 7mm (0.28"), injecting few rainy days into the monthly forecast. October's tranquil weather offers prime conditions for activities such as stargazing and camping. As November approaches, the weather shifts subtly with slightly less rainfall predicted.

Temperature

Ascension Island experiences the lowest of its temperatures in August through November, when the average high-temperatures rise to 28°C (82.4°F).

Heat index

For October, the heat index is calculated to be a hot 31°C (87.8°F). If one continues to be active during exposure, it might cause tiredness and subsequent heat cramps.
Understand that the heat index values take into account shaded locations and mild winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.

Humidity

The average relative humidity in October is 69%.

Rainfall

In Ascension Island, Saint Helena, Ascension and Tristan da Cunha, during October, the rain falls for 3 days and regularly aggregates up to 7mm (0.28") of precipitation. In Ascension Island, during the entire year, the rain falls for 30 days and collects up to 142mm (5.59") of precipitation.

Sea temperature

September and October, with an average sea temperature of 24°C (75.2°F), are months with the coldest seawater.
Note: If cold is not your friend, swimming at 24°C (75.2°F) might be daunting. But the right mix of sunshine, wind, and external temperature can make a difference. Although wetsuits are not essential, they can enhance the swimming experience.

Daylight

The average length of the day in October is 12h and 17min.
On the first day of October, 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

The months with the highest UV index in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, are January through April, September through December, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme health hazard from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 12 in October interprets into the following recommendations:
Enforce all necessary precautions, unprotected skin might burn swiftly. 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. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Combat sunburn and harmful sun radiation by consistently applying sunscreen with at least 30 SPF. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.