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

Weather in October

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.
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FAQ

What are the coldest months in Ascension Island?

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

What is the temperature in October in Ascension Island?

In October, in Ascension Island, the average high-temperature is 28°C (82.4°F), and the average low-temperature is 22°C (71.6°F). In October, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is appraised at 30.5°C (86.9°F).

What is the average humidity in October in Ascension Island?

The average relative humidity in October is 69%.

How much does it rain in Ascension Island in October?

In October, in Ascension Island, the rain falls for 3 days. Throughout October, 7mm (0.28") of precipitation is accumulated.

What are the months with the coldest sea water in Ascension Island?

The months with the coldest seawater are September and October, with an average sea temperature of 24°C (75.2°F).

What is the sea temperature in October in Ascension Island?

In October, the average sea temperature in Ascension Island is 24°C (75.2°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24°C (75.2°F) water may be enjoyable.

How many hours of daylight does Ascension Island have in October?

The average day length in October in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, is 12h and 17min.

When is the sunrise / sunset in October in Ascension Island?

In October, on the first day of the month, sunrise is at 06:41 and sunset at 18:52. On the last day of the month, in Ascension Island, sunrise is at 06:29 and sunset at 18:52 GMT.

What is the month with the least sunshine in Ascension Island?

With an average of 5.2h of sunshine, October has the least sunshine of the year in Ascension Island, Saint Helena, Ascension and Tristan da Cunha.

How many hours of sunshine does Ascension Island have in October?

In Ascension Island, the average sunshine duration in October is 5.2h.

What are the months with the highest UV index in Ascension Island?

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.

What is the UV index reading in October in Ascension Island?

In Ascension Island, Saint Helena, Ascension and Tristan da Cunha, the average daily maximum UV index in October is 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unsafe exposure to Sun's UV rays.

Average temperature in October
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average temperature in October - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in October: 28°C

The warmest months (with the highest average high temperature) are February, March, April and May (31°C).
The months with the lowest average high temperature are August, September, October and November (28°C).

  • Average low temperature in October: 22°C

The months with the highest average low temperature are March, April and May (24°C).
The coldest months (with the lowest average low temperature) are July, August, September, October, November and December (22°C).

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Average humidity in October
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average humidity in October - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average humidity in October: 69%

The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is July (67%).

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Average rainfall in October
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average rainfall in October - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in October: 7mm

The wettest month (with the highest rainfall) is April (33mm).
The driest months (with the least rainfall) are January, November and December (4mm).

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Average rainfall days in October
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average rainfall days in October - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall days in October: 3 days

The month with the highest number of rainy days is April (4 days).
The months with the least rainy days are November and December (1 days).

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Average sea temperature in October
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average sea temperature in October - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average sea temperature in October: 24°C

The best months for swimming (with the highest average sea temperature) are March, April and May (28°C).
The coldest months (with the lowest average sea temperature) are September and October (24°C).

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Average daylight in October /
Average sunshine in October
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average daylight in October / Average sunshine in October - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in October: 12h and 17min

The month with the longest days is December (Average daylight: 12h and 35min).
The month with the shortest days is June (Average daylight: 11h and 40min).

  • Average sunshine in October: 5.2h

The months with the most sunshine are March and April (Average sunshine: 8.9h).
The month with the least sunshine is October (Average sunshine: 5.2h).

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Average UV index in October
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average UV index in October - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average UV index in October: 12

The months with the highest UV index are January, February, March, April, September, October, November and December (UV index 12).
The months with the lowest UV index are June and July (UV index 9).

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