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

September weather forecast and climate
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).
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).
Coldest months (with the lowest average low temperature) are August and September (10°C).

  • Average rainfall in September: 169mm

The wettest month (with the highest rainfall) is August (175mm).
The driest month (with the lowest rainfall) is January (93mm).

  • Average rainfall days in September: 24 days

The month with the highest number of rainy days is August (26 days).
The month with the lowest number of rainy days is February (16 days).

  • Average sea temperature in September: 13°C

Best months for swimming (with the highest average sea temperature) are February and March (18°C).
Coldest months (with the lowest average sea temperature) are August and September (13°C).

  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 14.7h).
The month with shortest days is June (Average daylight: 9.6h).

  • Average sunshine in September: 4h

The month with most sunshine is February (Average sunshine: 5.1h).
The month with least sunshine is June (Average sunshine: 3.3h).

  • Average UV index in September: 5

The month with the highest UV index is January (UV index 12).
Months with the lowest UV index are June and July (UV index 2).

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