Avarua District
Cook Islands
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Avarua District, Cook Islands

Aerial view of the coastal Avarua District in the Cook Islands, with clear calm waters and mountains
Aerial view of the coastal Avarua District in the Cook Islands, with clear calm waters and mountains
September, the first month of the spring, in Avarua District, is also a moderately hot month, with average temperature ranging between max 26°C (78.8°F) and min 19°C (66.2°F).

Temperature

In Avarua District, the average high-temperature is essentially the same as in August - a still warm 26°C (78.8°F). In Avarua District, the average low-temperature is 19°C (66.2°F).

Rainfall

In Avarua District, during September, the rain falls for 5 days and regularly aggregates up to 132mm (5.2") of precipitation. Throughout the year, in Avarua District, Cook Islands, there are 114 rainfall days, and 2190mm (86.2") of precipitation is accumulated.

Sea temperature

August and September, with an average sea temperature of 24.5°C (76.1°F), are months with the coldest seawater.
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.5°C (76.1°F) water. (FYI: The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).)

Daylight

In September, the average length of the day is 12h.

Sunshine

In Avarua District, the average sunshine in September is 5h.

UV index

In September, the average daily maximum UV index is 10. A UV Index of 8 to 10 symbolizes a very high health risk from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 10 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in September in Avarua District?

The average high-temperature, in September, in Avarua District, is 26°C (78.8°F), while the average low-temperature is 19°C (66.2°F).

How much does it rain in Avarua District in September?

In September, in Avarua District, Cook Islands, the rain falls for 5 days. Throughout September, 132mm (5.2") of precipitation is accumulated.

When is the sea coldest in Avarua District?

August and September, with an average sea temperature of 24.5°C (76.1°F), are months with the coldest seawater.

How warm is the water in September in Avarua District?

In Avarua District, Cook Islands, the average seawater temperature in September is 24.5°C (76.1°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24.5°C (76.1°F) water may be enjoyable.

How many hours of daylight does Avarua District have in September?

In September, the average length of the day in Avarua District is 12h.

How long on average sun shines in September in Avarua District?

In September, the average sunshine in Avarua District, Cook Islands, is 5h.

What is the UV index intensity in September in Avarua District?

In Avarua District, the average daily maximum UV index in September is 10. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in September - Avarua District, Cook Islands
  • Average high temperature in September: 26°C

Warmest months (with the highest average high temperature) are February and March (29°C).
Months with the lowest average high temperature are July and August (25°C).

  • Average low temperature in September: 19°C

Months with the highest average low temperature are January, February and March (23°C).
Coldest months (with the lowest average low temperature) are July, August and September (19°C).

Average rainfall in September - Avarua District, Cook Islands
  • Average rainfall in September: 132mm

The wettest month (with the highest rainfall) is January (267mm).
The driest month (with the lowest rainfall) is July (102mm).

Average rainfall days in September - Avarua District, Cook Islands
  • Average rainfall days in September: 5 days

Months with the highest number of rainy days are January, February and March (17 days).
The month with the lowest number of rainy days is August (3 days).

Average sea temperature in September - Avarua District, Cook Islands
  • Average sea temperature in September: 24.5°C

The best month for swimming (with the highest average sea temperature) is February (27.8°C).
Coldest months (with the lowest average sea temperature) are August and September (24.5°C).

Average daylight in September / Average sunshine in September - Avarua District, Cook Islands
  • Average daylight in September: 12h

The month with the longest days is December (Average daylight: 13.4h).
The month with shortest days is June (Average daylight: 10.9h).

  • Average sunshine in September: 5h

Months with most sunshine are January, February and March (Average sunshine: 17h).
The month with least sunshine is August (Average sunshine: 3h).

Average UV index in September - Avarua District, Cook Islands
  • Average UV index in September: 10

Months with the highest UV index are January, February, March, October, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 6).