Climate and monthly weather forecast
Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha

The Longwood house, an ancient exile residence of Napoleon, in Saint Helena Island, Sanit Helena
The Longwood house, an ancient exile residence of Napoleon, in Saint Helena Island, Sanit Helena

Weather in January

January, like December, is an agreeable summer month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with temperature in the range of an average high of 22°C (71.6°F) and an average low of 18°C (64.4°F). Weather in January »

Weather in February

February, the last month of the summer in Saint Helena Island, is a warm month, with an average temperature ranging between max 23°C (73.4°F) and min 19°C (66.2°F). February and March, with an average high-temperature of 23°C (73.4°F), are the warmest months. Weather in February »

Weather in March

The first month of the autumn, March, is also a moderately hot month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with temperature in the range of an average low of 19°C (66.2°F) and an average high of 23°C (73.4°F). Weather in March »

Weather in April

April, like March, is an agreeable autumn month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with temperature in the range of an average low of 18°C (64.4°F) and an average high of 22°C (71.6°F). In April, the average high-temperature is essentially the same as in March - a pleasant 22°C (71.6°F). Weather in April »

Weather in May

The last month of the autumn, May, is also an agreeable month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with an average temperature fluctuating between 21°C (69.8°F) and 17°C (62.6°F). In Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, the average high-temperature in May is relatively the same as in April - a still agreeable 21°C (69.8°F). Weather in May »

Weather in June

June, the first month of the winter in Saint Helena Island, is also an enjoyable month, with temperature in the range of an average low of 16°C (60.8°F) and an average high of 19°C (66.2°F). In Saint Helena Island, the average high-temperature in June is relatively the same as in May - a comfortable 19°C (66.2°F). Weather in June »

Weather in July

July, like June, in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, is another comfortable winter month, with an average temperature ranging between min 15°C (59°F) and max 18°C (64.4°F). In July, the average high-temperature is relatively the same as in June - a still comfortable 18°C (64.4°F). Weather in July »

Weather in August

August, the last month of the winter in Saint Helena Island, is also an enjoyable month, with an average temperature varying between 14°C (57.2°F) and 17°C (62.6°F). With an average high-temperature of 17°C (62.6°F) and an average low-temperature of 14°C (57.2°F), August is the coldest month. Weather in August »

Weather in September

The first month of the spring, September, is still a comfortable month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with an average temperature fluctuating between 18°C (64.4°F) and 15°C (59°F). Weather in September »

Weather in October

October, like September, in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, is another comfortable spring month, with temperature in the range of an average high of 18°C (64.4°F) and an average low of 15°C (59°F). Weather in October »

Weather in November

November, the last month of the spring in Saint Helena Island, is also an enjoyable month, with temperature in the range of an average high of 19°C (66.2°F) and an average low of 15°C (59°F). In Saint Helena Island, the average high-temperature in November is relatively the same as in October - a still comfortable 19°C (66.2°F). Weather in November »

Weather in December

December, the first month of the summer in Saint Helena Island, is a pleasant month, with temperature in the range of an average high of 20°C (68°F) and an average low of 16°C (60.8°F). In Saint Helena Island, the average high-temperature in December is relatively the same as in November - a pleasant 20°C (68°F). Weather in December »
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FAQ

How much does it rain in Saint Helena Island?

Throughout the year, there are 170 rainfall days, and 748mm (29.45") of precipitation is accumulated.

What is the month with the highest UV index in Saint Helena Island?

The months with the highest UV index in Saint Helena Island are January through March, October through December, with an average maximum UV index of 12.

What are the warmest months in Saint Helena Island?

Warmest months are February and March, with an average high-temperature of 23°C (73.4°F).

What months are the sea warmest in Saint Helena Island?

The months with the warmest seawater in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, are February through April, with an average sea temperature of 25°C (77°F).

What is the wettest month in Saint Helena Island?

March is the month with the most rainfall. Rain falls for 15 days and accumulates 90mm (3.54") of precipitation.

What is the month with the shortest days in Saint Helena Island?

With an average of 11h and 12min of daylight, June has the shortest days of the year in Saint Helena Island.

What is the month with the most sunshine in Saint Helena Island?

The months with the most sunshine are June and July, with an average of 16h of sunshine.

When is the lowest UV index in Saint Helena Island?

The month with the lowest UV index in Saint Helena Island is June, with an average maximum UV index of 7.

What is the coldest month in Saint Helena Island?

The coldest month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, is August, with an average high-temperature of 17°C (62.6°F) and an average low-temperature of 14°C (57.2°F).

What is the month with the least sunshine in Saint Helena Island?

September and December, with an average of 12h of sunshine, are months with the least sunshine.

When is the sea coldest in Saint Helena Island?

With an average sea temperature of 20°C (68°F), October is the month with the coldest seawater.

What is the driest month in Saint Helena Island?

November is the month with the least rainfall. Rain falls for 13 days and accumulates 30mm (1.18") of precipitation.

When are the longest days in Saint Helena Island?

December has the longest days of the year, with an average of 13h and 4min of daylight.

Is there Daylight Saving Time (DST) in Saint Helena Island?

Saint Helena Island does not utilize Daylight Saving Time (DST). GMT timezone is used over the entire year.

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

Average temperature - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha

The warmest months (with the highest average high temperature) are February and March (23°C).
The month with the lowest average high temperature is August (17°C).

The months with the highest average low temperature are February and March (19°C).
The coldest month (with the lowest average low temperature) is August (14°C).

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

Average rainfall - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha

The wettest month (with the highest rainfall) is March (90mm).
The driest month (with the least rainfall) is November (30mm).

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

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

The months with the highest number of rainy days are June and July (16 days).
The months with the least rainy days are September and December (12 days).

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

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

The best months for swimming (with the highest average sea temperature) are February, March and April (25°C).
The coldest month (with the lowest average sea temperature) is October (20°C).

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

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

The month with the longest days is December (Average daylight: 13h and 4min).
The month with the shortest days is June (Average daylight: 11h and 12min).

The months with the most sunshine are June and July (Average sunshine: 16h).
The months with the least sunshine are September and December (Average sunshine: 12h).

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

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

The months with the highest UV index are January, February, March, October, November and December (UV index 12).
The month with the lowest UV index is June (UV index 7).

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