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

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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

Weather shifts brought about by the new year usher in a warm start to January in Saint Helena Island, Ascension, and Tristan da Cunha. Beachgoers appreciate the warmer conditions and may witness dramatic but brief rainy spells. Although less sunlight is visible in January compared to December, the UV index remains at its highest at 12, necessitating protective measures against the sun. There is an expected rainfall amount of up to 53mm (2.09"). This pattern of warm and wet weather sets a distinctive tone for the island's version of summertime.

Temperature

The commencement of January introduces an average high-temperature of a still agreeable 22°C (71.6°F), closely mirroring the preceding month. In January, Saint Helena Island experiences a marginal drop in temperature, with averages of 18°C (64.4°F) at night.

Rainfall

In Saint Helena Island, during January, the rain falls for 14 days and regularly aggregates up to 53mm (2.09") of precipitation. Throughout the year, there are 170 rainfall days, and 748mm (29.45") of precipitation is accumulated.

Sea temperature

In January, the average sea temperature is 23°C (73.4°F).
Note: Swimming in 23°C (73.4°F) water can be enjoyable based on one's cold tolerance and conditions like sunshine, wind, and ambient temperature. (Olympic swimmers compete in waters between 25°C (77°F) and 28°C (82.4°F).)

Daylight

The average length of the day in January is 12h and 57min.
On the first day of January in Saint Helena Island, sunrise is at 05:54 and sunset at 18:57. On the last day of the month, sunrise is at 06:11 and sunset at 19:00 GMT.

Sunshine

In Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, the average sunshine in January is 14h.

UV index

The months with the highest UV index in Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, are January through March, October through December, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an excessive health risk from unsafe exposure to UV radiation for the average person.
Note: In January, a daily maximum UV index of 12 leads to the following instructions:
Enforce every key safety measure. Those with light skin might get burns in a matter of minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Avoid direct sun exposure for long periods, especially if prone to burns. Always apply a sunscreen with at least a 30 SPF. Attention! The combination of sand and water reflections enhances UV ray intensity.

Frequently asked questions

What is the average January temperature in Saint Helena Island?

The high-temperature during January is 22°C (71.6°F) and the low-temperature is 18°C (64.4°F).

How many days does it rain in January in Saint Helena Island?

In Saint Helena Island, in January, it is raining for 14 days, with typically 53mm (2.09") of accumulated precipitation.

What is the water temperature in January in Saint Helena Island?

In Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, the average seawater temperature in January is 23°C (73.4°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23°C (73.4°F) water.

What is the average length of the day in January in Saint Helena Island?

In January, the average day length in Saint Helena Island is 12h and 57min.

What time are sunrise and sunset in January in Saint Helena Island?

In January, on the first day of the month, sunrise is at 05:54 and sunset at 18:57. On the last day of the month, in Saint Helena Island, sunrise is at 06:11 and sunset at 19:00 GMT.

How long on average sun shines in January in Saint Helena Island?

In January, the average sunshine duration in Saint Helena Island is 14h.

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 is the UV index reading in January in Saint Helena Island?

In Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha, the average daily maximum UV index in January is 12. A UV Index of 11, and more, symbolizes an ultimate hazard to health from exposure to the Sun's UV radiation.
Average rainfall days
Average daylight
Average sunshine
Average UV index

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

Average temperature in January - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in January: 22°C

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).

  • Average low temperature in January: 18°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).

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

Average rainfall in January - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in January: 53mm

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

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

Average rainfall days in January - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall days in January: 14 days

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).

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

Average sea temperature in January - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha
  • Average sea temperature in January: 23°C

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

Average daylight in January / Average sunshine in January - Saint Helena Island, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in January: 13h and 0min

The month with the longest days is December (Average daylight: 13h and 6min).
The month with the shortest days is June (Average daylight: 11h and 12min).

  • Average sunshine in January: 14h

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).

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

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

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).

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

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