September weather forecast
Avarua District, Cook Islands

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The coastal Avarua District in the Cook Islands, with clear calm waters and mountains
The coastal Avarua District in the Cook Islands, with clear calm waters and mountains

Weather in September

In September, the Avarua District weather displays warming signs with a slight increase in average temperatures. Moderately dry conditions resume with rainfall back down to 132mm (5.2"). More daylight hours allow for enhanced viewing of the exotic locale. The hours of sunshine equal the number of rainy days in September. Therefore, the weather conditions facilitate a fair balance between humid and dry experiences.

Temperature

The unfolding of September in Avarua District shows an average high-temperature of a still warm 26°C (78.8°F), indicating a slight variance from August's 25°C (77°F). In September, the average low-temperature in Avarua District records at a comfortable 19°C (66.2°F) during the nights.

Rainfall

In Avarua District, during September, the rain falls for 5 days and regularly aggregates up to 132mm (5.2") of precipitation. In Avarua District, during the entire year, the rain falls for 114 days and collects up to 2190mm (86.22") of precipitation.

Sea temperature

August and September, with an average sea temperature of 24.5°C (76.1°F), are months with the coldest seawater.
Note: People sensitive to cold might find swimming in 24.5°C (76.1°F) challenging. However, conditions like sunshine, wind, and ambient temperature play a significant role in the overall comfort. Wetsuits, while optional, might be beneficial.

Daylight

In September, the average length of the day in Avarua District is 11h and 59min.
On the first day of September, sunrise is at 06:47 and sunset at 18:30. On the last day of the month, sunrise is at 06:20 and sunset at 18:37 -10.

Sunshine

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

UV index

The average daily maximum UV index in September in Avarua District, Cook Islands, is 10. A UV Index of 8 to 10 symbolizes a very high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 10 in September translates into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Sunscreen with a sun protection factor of no less than 30 should be used liberally and reapplied frequently on overcast days, including after every swim or outdoor activity. Take heed! Reflections of sand and water make the Sun's UV rays stronger.

Frequently asked questions

What is the temperature in September in Avarua District?

In Avarua District, 26°C (78.8°F) is the average high-temperature and 19°C (66.2°F) is the average low-temperature during September.

How much does it rain in Avarua District in September?

In Avarua District, in September, it is raining for 5 days, with typically 132mm (5.2") of accumulated precipitation.

When is the sea coldest in Avarua District?

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

How warm is the water in September in Avarua District?

In Avarua District, in September, the average water temperature is 24.5°C (76.1°F). 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.

What is the average length of the day in September in Avarua District?

The average day length in September in Avarua District is 11h and 59min.

When is the sunrise / sunset in September in Avarua District?

On the first day of September, sunrise is at 06:47 and sunset at 18:30. On the last day of the month, sunrise is at 06:20 and sunset at 18:37 -10.

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

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

How high is the UV index in September in Avarua District?

The average daily maximum UV index in September in Avarua District, Cook Islands, is 10. A UV Index reading of 8 to 10 represents a very high hazard to health from exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Avarua District, Cook Islands

Average temperature in September - Avarua District, Cook Islands
  • Average high temperature in September: 26°C

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

  • Average low temperature in September: 19°C

The months with the highest average low temperature are January, February and March (23°C).
The 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 - Avarua District, Cook Islands
  • Average rainfall in September: 132mm

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

Average rainfall days in September
Avarua District, Cook Islands

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

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

Average sea temperature in September
Avarua District, Cook Islands

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).
The 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 / Average sunshine in September - Avarua District, Cook Islands
  • Average daylight in September: 12h and 0min

The month with the longest days is December (Average daylight: 13h and 24min).
The month with the shortest days is June (Average daylight: 10h and 54min).

  • Average sunshine in September: 5h

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

Average UV index in September
Avarua District, Cook Islands

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

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

Avarua District, Cook Islands

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