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

The valley town of Jamestown in Saint Helena, with a view of mountain slopes on both sides
The valley town of Jamestown in Saint Helena, with a view of mountain slopes on both sides

Weather in January

January, like December, in Jamestown, Saint Helena, Ascension and Tristan da Cunha, is another warm summer month, with average temperature ranging between min 21°C (69.8°F) and max 27°C (80.6°F). In January, the average high-temperature marginally rises, from 24°C (75.2°F) in December, to a still moderately hot 27°C (80.6°F). Weather in January »

Weather in February

The last month of the summer, February, is also a moderately hot month in Jamestown, Saint Helena, Ascension and Tristan da Cunha, with average temperature ranging between max 27°C (80.6°F) and min 21°C (69.8°F). In Jamestown, the average high-temperature remains the same as in January - a still moderately hot 27°C (80.6°F). Weather in February »

Weather in March

The first month of the autumn, March, is also a moderately hot month in Jamestown, Saint Helena, Ascension and Tristan da Cunha, with average temperature varying between 28°C (82.4°F) and 22°C (71.6°F). With an average high-temperature of 28°C (82.4°F) and an average low-temperature of 22°C (71.6°F), March is the warmest month. Weather in March »

Weather in April

April, like March, in Jamestown, Saint Helena, Ascension and Tristan da Cunha, is a moderately hot autumn month, with average temperature fluctuating between 21°C (69.8°F) and 27°C (80.6°F). In April, the average high-temperature is practically the same as in March - a still moderately hot 27°C (80.6°F). Weather in April »

Weather in May

May, the last month of the autumn, in Jamestown, is another warm month, with average temperature ranging between min 19°C (66.2°F) and max 24°C (75.2°F). In May, the average high-temperature slightly decreases, from 27°C (80.6°F) in April, to a still moderately hot 24°C (75.2°F). Weather in May »

Weather in June

June, the first month of the winter, in Jamestown, is also a moderately hot month, with average temperature varying between 23°C (73.4°F) and 18°C (64.4°F). In Jamestown, the average high-temperature in June is almost the same as in May - a still warm 23°C (73.4°F). Weather in June »

Weather in July

July, like June, is an agreeable winter month in Jamestown, Saint Helena, Ascension and Tristan da Cunha, with average temperature varying between 22°C (71.6°F) and 17°C (62.6°F). The coldest months are July through September, with an average high-temperature of 22°C (71.6°F). Weather in July »

Weather in August

August, the last month of the winter, in Jamestown, is also an agreeable month, with temperature in the range of an average low of 17°C (62.6°F) and an average high of 22°C (71.6°F). The coldest months are July through September, with an average high-temperature of 22°C (71.6°F). Weather in August »

Weather in September

The first month of the spring, September, is also an agreeable month in Jamestown, Saint Helena, Ascension and Tristan da Cunha, with average temperature varying between 22°C (71.6°F) and 17°C (62.6°F). July through September, with an average high-temperature of 22°C (71.6°F), are the coldest months. Weather in September »

Weather in October

October is a warm spring month in Jamestown, Saint Helena, Ascension and Tristan da Cunha, with average temperature fluctuating between 23°C (73.4°F) and 18°C (64.4°F). In October, the average high-temperature is relatively the same as in September - a moderately hot 23°C (73.4°F). Weather in October »

Weather in November

The last month of the spring, November, is another warm month in Jamestown, Saint Helena, Ascension and Tristan da Cunha, with average temperature fluctuating between 23°C (73.4°F) and 18°C (64.4°F). In November, the average high-temperature remains the same as in October - a still warm 23°C (73.4°F). Weather in November »

Weather in December

December, the first month of the summer, in Jamestown, is still a warm month, with average temperature ranging between max 24°C (75.2°F) and min 19°C (66.2°F). In Jamestown, the average high-temperature is essentially the same as in November - a still moderately hot 24°C (75.2°F). Weather in December »
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FAQ

How much does it rain in Jamestown?

In Jamestown, Saint Helena, Ascension and Tristan da Cunha, during the entire year, the rain falls for 40.7 days and collects up to 113mm (4.45") of precipitation.

What is the warmest month in Jamestown?

With an average high-temperature of 28°C (82.4°F) and an average low-temperature of 22°C (71.6°F), March is the warmest month.

What is the rainiest month in Jamestown?

The month with the most rainfall is March when the rain falls for 5 days and typically aggregates up to 20mm (0.79") of precipitation.

What is the month with the shortest days in Jamestown?

June has the shortest days of the year in Jamestown, Saint Helena, Ascension and Tristan da Cunha, with an average of 11.2h of daylight.

What are the coldest months in Jamestown?

July through September, with an average high-temperature of 22°C (71.6°F), are the coldest months in Jamestown.

What is the driest month in Jamestown?

The only month without rainfall is November.

When does it rain in Jamestown?

Months with rainfall are January through October and December.

When are the longest days in Jamestown?

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

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

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

The warmest month (with the highest average high temperature) is March (28°C).
Months with the lowest average high temperature are July, August and September (22°C).

The month with the highest average low temperature is March (22°C).
The coldest months (with the lowest average low temperature) are July, August and September (17°C).

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

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

The wettest month (with the highest rainfall) is March (20mm).
The driest month (with the least rainfall) is November (0mm).

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

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

The month with the highest number of rainy days is July (8 days).
The month with the least rainy days is November (0 days).

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Average daylight
Jamestown, Saint Helena, Ascension and Tristan da Cunha

Average daylight - Jamestown, 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).

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