Saint Helena Island
Saint Helena, Ascension and Tristan da Cunha
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha

January, the same as December, in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, is an agreeable summer month, with average temperature fluctuating between 22°C (71.6°F) and 18°C (64.4°F). In January, the average high-temperature is practically the same as in December - a still pleasant 22°C (71.6°F). Weather in January »

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

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 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 March »

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

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

The first month of the winter, June, is still a comfortable month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with temperature in the range of an average high of 19°C (66.2°F) and an average low of 16°C (60.8°F). Weather in June »

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

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

The first month of the spring, September, is also an enjoyable month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with average temperature fluctuating between 18°C (64.4°F) and 15°C (59°F). In September, the average high-temperature is relatively the same as in August - a still enjoyable 18°C (64.4°F). Weather in September »

October, the same as September, is another enjoyable spring month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with average temperature fluctuating between 15°C (59°F) and 18°C (64.4°F). In Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, the average high-temperature remains equal as in September - a still comfortable 18°C (64.4°F). Weather in October »

The last month of the spring, November, is also an enjoyable month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with temperature in the range of an average high of 19°C (66.2°F) and an average low of 15°C (59°F). Weather in November »

The first month of the summer, December, is an agreeable month in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, with average temperature fluctuating between 16°C (60.8°F) and 20°C (68°F). In December, the average high-temperature is almost the same as in November - a pleasant 20°C (68°F). Weather in December »

How many days does it rain in Saint Helena Island?

In Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, during the entire year, the rain falls for 170 days and collects up to 748mm (29.45") of precipitation.

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

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 in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, are February and March, with an average high-temperature of 23°C (73.4°F).

What are the months with the warmest sea water in Saint Helena Island?

Months with the warmest seawater in Saint Helena Island 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 in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha. 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 11.2h of daylight, June has the shortest days of the year.

What are the months with the most sunshine in Saint Helena Island?

Months with the most sunshine in Saint Helena Island are June and July, with an average of 16h of sunshine.

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

With an average maximum UV index of 7, June is the month with the lowest UV index in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha.

What is the coldest month in Saint Helena Island?

The coldest month 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.

What month is the sea coldest in Saint Helena Island?

The month with the coldest seawater in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, is October, with an average sea temperature of 20°C (68°F).

What is the driest month in Saint Helena Island?

The month with the least rainfall is November when the rain falls for 13 days and typically collects 30mm (1.18") of precipitation.

When are the longest days in Saint Helena Island?

The month with the longest days in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, is December, with an average of 13.1h of daylight.
Average temperature - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha
Average rainfall - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha
Average rainfall days - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha

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

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).

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

The month with the longest days is December (Average daylight: 13.1h).
The month with the shortest days is June (Average daylight: 11.2h).

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

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

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).