Arutanga
Cook Islands
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Arutanga, Cook Islands

The first month of the spring, September, is still a warm month in Arutanga, Cook Islands, with average temperature varying between 28°C (82.4°F) and 21°C (69.8°F).
The ideal sea water temperature of 26°C (78.8°F) and only 5 rainfall days, with 90mm (3.5") of accumulated rainfall, make September the best time for swimming and other water activities.

Temperature

In September, the average high-temperature is essentially the same as in August - a still moderately hot 28°C (82.4°F). In Arutanga, in September, the average low-temperature is 21°C (69.8°F).

Rainfall

In Arutanga, during September, the rain falls for 5 days and regularly aggregates up to 90mm (3.5") of precipitation. In Arutanga, during the entire year, the rain falls for 114 days and collects up to 1984mm (78.1") of precipitation.

Sea temperature

Months with the coldest seawater are July through October, with an average sea temperature of 26°C (78.8°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

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

Sunshine

The average sunshine in September is 5h.

UV index

In September, the average daily maximum UV index is 11. A UV Index of 11, and more, symbolizes an extreme threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 11 in September interpret into the following advice:
Practice all essential precautions. Protection against sun damage is crucial. 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 Arutanga?

In Arutanga, Cook Islands, in September, the average high-temperature is 28°C (82.4°F), and the average low-temperature is 21°C (69.8°F).

How many days does it rain in September in Arutanga?

In September, the rain falls for 5 days. Throughout September, 90mm (3.5") of precipitation is accumulated.

When is the sea coldest in Arutanga?

Through and October, with an average sea temperature of 26°C (78.8°F).

What is the water temperature in September in Arutanga?

In Arutanga, Cook Islands, the average seawater temperature in September is 26°C (78.8°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in September in Arutanga?

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

How many hours of sunshine does Arutanga have in September?

In September, the average sunshine in Arutanga is 5h.

How high is the UV index in September in Arutanga?

The average daily maximum UV index in September in Arutanga is 11. A UV Index of 11, and more, symbolizes an extreme health vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Arutanga, Cook Islands
  • Average high temperature in September: 28°C

Warmest months (with the highest average high temperature) are January, February and March (30°C).
Months with the lowest average high temperature are July and August (27°C).

  • Average low temperature in September: 21°C

Months with the highest average low temperature are January, February and March (24°C).
Coldest months (with the lowest average low temperature) are July, August and September (21°C).

Average rainfall in September - Arutanga, Cook Islands
  • Average rainfall in September: 90mm

The wettest month (with the highest rainfall) is January (251mm).
The driest month (with the lowest rainfall) is July (81mm).

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

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

Average sea temperature in September - Arutanga, Cook Islands
  • Average sea temperature in September: 26°C

Best months for swimming (with the highest average sea temperature) are January, February, March and April (28°C).
Coldest months (with the lowest average sea temperature) are July, August, September and October (26°C).

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

The month with the longest days is December (Average daylight: 13.3h).
The month with shortest days is June (Average daylight: 11h).

  • Average sunshine in September: 5h

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

Average UV index in September - Arutanga, Cook Islands
  • Average UV index in September: 11

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