Weather in September
Winter gently gives way to spring in September with sunlight hours slowly gaining some momentum while the temperature begins to climb. A significant characteristic of September's weather is the drop in rainfall to 169mm (6.65") which provides a slight respite after a pronounced wet spell. Besides, the sea temperature remains consistent, aligning with the overall mild weather pattern of this month. The arrival of spring paints the island in shades of pleasantness and calmness, making it a popular choice for multiple outdoor activities.
Note: Caution: 13°C (55.4°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.
On the first day of September in Tristan da Cunha, sunrise is at 07:08 and sunset at 18:28. On the last day of the month, sunrise is at 06:25 and sunset at 18:52 GMT.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Undertake precautions - Guarding against sun damage is counselled. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Temperature
July through September mark Tristan da Cunha's lowest temperatures, averaging a high-temperature of 14°C (57.2°F).Rainfall
In September, the rain falls for 24 days. Throughout September, 169mm (6.65") of precipitation is accumulated. Throughout the year, there are 251 rainfall days, and 1681mm (66.18") of precipitation is accumulated.Sea temperature
August and September, with an average sea temperature of 13°C (55.4°F), are months with the coldest seawater.Note: Caution: 13°C (55.4°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.
Daylight
In Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, the average length of the day in September is 11h and 52min.On the first day of September in Tristan da Cunha, sunrise is at 07:08 and sunset at 18:28. On the last day of the month, sunrise is at 06:25 and sunset at 18:52 GMT.
Sunshine
The average sunshine in September is 4h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Undertake precautions - Guarding against sun damage is counselled. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Updated: Jan 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Tristan da Cunha?
Lowest temperatures in Tristan da Cunha are observed in July through September, averaging a high-temperature of 14°C (57.2°F).
What are the temperatures in Tristan da Cunha in September?
In Tristan da Cunha, in September, the average high-temperature is 14°C (57.2°F), and the average low-temperature is 10°C (50°F).
How much does it rain in Tristan da Cunha in September?
In Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, in September, it is raining for 24 days, with typically 169mm (6.65") of accumulated precipitation.
What are the months with the coldest sea water in Tristan da Cunha?
The months with the coldest seawater are August and September, with an average sea temperature of 13°C (55.4°F).
What is the sea water temperature in September in Tristan da Cunha?
In Tristan da Cunha, in September, the average water temperature is 13°C (55.4°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.
What is the average length of the day in September in Tristan da Cunha?
In Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, the average day length in September is 11h and 52min.
When is the sunrise / sunset in September in Tristan da Cunha?
In September, on the first day of the month, sunrise is at 07:08 and sunset at 18:28. On the last day of the month, in Tristan da Cunha, sunrise is at 06:25 and sunset at 18:52 GMT.
How long on average sun shines in September in Tristan da Cunha?
In Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, the average sunshine duration in September is 4h.
How high is the UV index in September in Tristan da Cunha?
In September, the average daily maximum UV index in Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha, is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average temperature in September
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average high temperature in September: 14°C
The warmest month (with the highest average high temperature) is February (21°C).
The months with the lowest average high temperature are July, August and September (14°C).
- Average low temperature in September: 10°C
The month with the highest average low temperature is February (17°C).
The coldest months (with the lowest average low temperature) are August and September (10°C).
Average rainfall in September
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average rainfall in September: 169mm
The wettest month (with the highest rainfall) is August (175mm).
The driest month (with the least rainfall) is January (93mm).
Average rainfall days in September
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average rainfall days in September: 24 days
The month with the highest number of rainy days is August (26 days).
The month with the least rainy days is February (16 days).
Average sea temperature in September
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average sea temperature in September: 13°C
The best months for swimming (with the highest average sea temperature) are February and March (18°C).
The coldest months (with the lowest average sea temperature) are August and September (13°C).
Average daylight in September /
Average sunshine in September
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average daylight in September: 11h and 5min
The month with the longest days is December (Average daylight: 14h and 42min).
The month with the shortest days is June (Average daylight: 9h and 42min).
- Average sunshine in September: 4h and 0min
The month with the most sunshine is February (Average sunshine: 5h and 6min).
The month with the least sunshine is June (Average sunshine: 3h and 18min).
Average UV index in September
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
- Average UV index in September: 5
The month with the highest UV index is January (UV index 12).
The months with the lowest UV index are June and July (UV index 2).
Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha
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