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

October amplifies the warm shift begun in September, making the weather entirely pleasant. The island registers fewer rainy days than in previous months, offering more hours of glorious sunshine. The gently warming sea and gradually increasing temperature leads to a proliferation of marine life, attracting enthusiasts from all corners. Despite averaging a low rainfall of 43mm (1.69"), October’s weather traits perfectly personify the quintessential spring-like conditions. Hence, October is an opportune time for leisure activities such as beach outings and picnics.

Temperature

Saint Helena Island registers an average high-temperature of a still enjoyable 18°C (64.4°F) with the arrival of October, showing minor deviation from the preceding month. Throughout October, Saint Helena Island observes a steady low-temperature average of 15°C (59°F), reflecting a minor dip from daytime highs.

Rainfall

In October, the rain falls for 14 days. Throughout October, 43mm (1.69") of precipitation is accumulated. Throughout the year, there are 170 rainfall days, and 748mm (29.45") of precipitation is accumulated.

Sea temperature

With an average sea temperature of 20°C (68°F), October is the month with the coldest seawater.
Note: For swimming, a surface water temperature of 20°C (68°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

In October, the average length of the day in Saint Helena Island is 12h and 28min.
On the first day of October in Saint Helena Island, sunrise is at 06:04 and sunset at 18:19. On the last day of the month, sunrise is at 05:45 and sunset at 18:26 GMT.

Sunshine

The average sunshine in October in Saint Helena Island is 14h.

UV index

The months with the highest UV index are January through March, October through December, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In October, the UV index of 12 transforms into the following advice:
Ensure all key precautions. Defense against sun exposure is critical. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.