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

September 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
September, the first month of the spring, in Jamestown, is also an agreeable month, with temperature in the range of an average high of 22°C (71.6°F) and an average low of 17°C (62.6°F).

Temperature

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

Rainfall

In September, in Jamestown, the rain falls for 2 days. Throughout September, 5mm (0.2") of precipitation is accumulated. Throughout the year, in Jamestown, there are 40.7 rainfall days, and 113mm (4.4") of precipitation is accumulated.

Daylight

The average length of the day in September in Jamestown, Saint Helena, Ascension and Tristan da Cunha, is 12h.

What is the coldest month in Jamestown?

The coldest months in Jamestown, Saint Helena, Ascension and Tristan da Cunha, are July through September, with an average high-temperature of 22°C (71.6°F).

What is the temperature in September in Jamestown?

The average high-temperature, in September, is 22°C (71.6°F), while the average low-temperature is 17°C (62.6°F).

How much does it rain in Jamestown in September?

In Jamestown, Saint Helena, Ascension and Tristan da Cunha, in September, during 2 rainfall days, 5mm (0.2") of precipitation is typically accumulated.

How many hours of daylight does Jamestown have in September?

The average length of the day in September in Jamestown is 12h.
Average temperature in September - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in September: 22°C

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).

  • Average low temperature in September: 17°C

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

Average rainfall in September - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in September: 5mm

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

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

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

Average daylight in September - Jamestown, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in September: 12h

The month with the longest days is December (Average daylight: 13.1h).
The month with shortest days is June (Average daylight: 11.2h).