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

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Weather in January

Gentle whispers of warm air hover over Ascension Island marking the start of a new year. Compared to December, January weather sees a negligible increase in temperature from 28°C (82.4°F) to 30°C (86°F) as the highest value recorded for the day. Expect cooler evenings with an inviting sea breeze that’s perfect for strolling under the starlit sky. The sun shines generously during this period and occasional light rain showers happen to quench the thirst of the ground. As February approaches, ocean temperatures rise steadily, setting the stage for wonderful coastal activities.

Temperature

The onset of January manifests an average high-temperature of a tropical 30°C (86°F), demonstrating a minor variation from the preceding month. Ascension Island, during the month of January, experiences an average low-temperature of 23°C (73.4°F).

Heat index

In January, the heat index is calculated to be a fiery hot 35°C (95°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The most humid month in Ascension Island is January, with an average relative humidity of 70%.

Rainfall

The months with the least rainfall are January, November and December Rain falls for 2 days and accumulates 4mm (0.16") of rain.

Sea temperature

In Ascension Island, the average seawater temperature in January is 26°C (78.8°F).
Note: Between 25°C (77°F) and 29°C (84.2°F), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.

Daylight

In Ascension Island, the average length of the day in January is 12h and 31min.
On the first day of the month, sunrise is at 06:43 and sunset at 19:18. On the last day of January, in Ascension Island, sunrise is at 06:57 and sunset at 19:24 GMT.

Sunshine

The average sunshine in January is 7.4h.

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 of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for average individuals.
Note: In January, the maximum UV index of 12 suggests this advice:
Ensure all key precautions. Defense against sun exposure is critical. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Even on overcast days, ensure the application and frequent reapplication of sunscreen with at least an SPF 30, especially post swim or outdoor exercise. Be alert! The reflection of water and sand augments UV radiation intensity.
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Frequently asked questions

How hot is it in Ascension Island in January?

In Ascension Island, in January, the average high-temperature is 30°C (86°F), and the average low-temperature is 23°C (73.4°F). In January, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, is calculated to be 35°C (95°F).

What is the most humid month in Ascension Island?

With an average relative humidity of 70%, January is the most humid month in Ascension Island, Saint Helena, Ascension and Tristan da Cunha.

What is the average humidity in January in Ascension Island?

The average relative humidity in January in Ascension Island is 70%.

What is the driest month in Ascension Island?

The months with the least rainfall in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, are January, November and December Rain falls for 2 days and accumulates 4mm (0.16") of rain.

How much does it rain in Ascension Island in January?

In January, in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, the rain falls for 2 days. Throughout January, 4mm (0.16") of precipitation is accumulated.

What is the sea water temperature in January in Ascension Island?

In January, the average sea temperature in Ascension Island is 26°C (78.8°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in January in Ascension Island?

In January, the average day length in Ascension Island is 12h and 31min.

When are sunrise and sunset in January in Ascension Island?

On the first day of January, sunrise is at 06:43 and sunset at 19:18. On the last day of the month, sunrise is at 06:57 and sunset at 19:24 GMT.

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

The average sunshine duration in January is 7.4h.

When is the highest UV index in Ascension Island?

The months with the highest UV index are January through April, September through December, with an average maximum UV index of 12.

How high is the UV index in January in Ascension Island?

In January, the average daily maximum UV index in Ascension Island, Saint Helena, Ascension and Tristan da Cunha, is 12. A UV Index value of 11, and more, symbolizes an extreme health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

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

Average temperature in January - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in January: 30°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 January: 23°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 January
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average humidity in January - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average humidity in January: 70%

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

Average rainfall in January - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in January: 4mm

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

Average rainfall days in January - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall days in January: 2 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 January
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average sea temperature in January - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average sea temperature in January: 26°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 January /
Average sunshine in January
Ascension Island, Saint Helena, Ascension and Tristan da Cunha

Average daylight in January / Average sunshine in January - Ascension Island, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in January: 12h and 3min

The month with the longest days is December (Average daylight: 12h and 36min).
The month with the shortest days is June (Average daylight: 11h and 42min).

  • Average sunshine in January: 7h and 2min

The months with the most sunshine are March and April (Average sunshine: 8h and 54min).
The month with the least sunshine is October (Average sunshine: 5h and 12min).

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

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

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