September weather forecast
Roto, Cook Islands

Weather in September

September, the first month of the spring in Roto, is still a warm month, with an average temperature fluctuating between 27.8°C (82°F) and 27.1°C (80.8°F).

Temperature

With an average high-temperature of 27.8°C (82°F) and an average low-temperature of 27.1°C (80.8°F), September is the coldest month.

Heat index

The average heat index in September is evaluated at a tropical 31.2°C (88.2°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, pregnancy, differences in body mass, height, and shape). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The months with the highest humidity in Roto are June through September, with an average relative humidity of 77%.

Rainfall

September is the month with the least rainfall. Rain falls for 21.6 days and accumulates 78mm (3.07") of precipitation.

Daylight

In Roto, the average length of the day in September is 12h and 3min.
On the first day of the month, sunrise is at 07:05 and sunset at 19:00. On the last day of September, in Roto, sunrise is at 06:47 and sunset at 18:58 -10.

Sunshine

The month with the most sunshine is September, with an average of 8.5h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Roto. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Roto?

With an average high-temperature of 27.8°C (82°F) and an average low-temperature of 27.1°C (80.8°F), September is the coldest month in Roto, Cook Islands.

What is the temperature in September in Roto?

In Roto, Cook Islands, in September, the average high-temperature is 27.8°C (82°F), and the average low-temperature is 27.1°C (80.8°F). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 31.2°C (88.2°F).

What are the most humid months in Roto?

June through September, with an average relative humidity of 77%, are most humid months.

What is the average humidity in September in Roto?

The average relative humidity in September in Roto is 77%.

What is the driest month in Roto?

The month with the least rainfall in Roto is September, when the rain falls for 21.6 days and typically collects 78mm (3.07") of precipitation.

How many days does it rain in September in Roto?

In September, in Roto, the rain falls for 21.6 days. Throughout September, 78mm (3.07") of precipitation is accumulated.

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

In Roto, the average day length in September is 12h and 3min.

When is the sunrise / sunset in September in Roto?

On the first day of September, sunrise is at 07:05 and sunset at 19:00. On the last day of the month, sunrise is at 06:47 and sunset at 18:58 -10.

What month has the most sunshine in Roto?

The month with the most sunshine in Roto, Cook Islands, is September, with an average of 8.5h of sunshine.

How many hours of sunshine does Roto have in September?

In Roto, the average sunshine duration in September is 8.5h.

When is the highest UV index in Roto?

The months with the highest UV index are January through December, with an average maximum UV index of 7.

What are the months with the lowest UV index in Roto?

January through December, with an average maximum UV index of 7, are months with the lowest UV index.

What is the UV index reading in September in Roto?

In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.

Average temperature in September
Roto, Cook Islands

Average temperature in September - Roto, Cook Islands
  • Average high temperature in September: 27.8°C

The warmest months (with the highest average high temperature) are March, April and May (29°C).
The month with the lowest average high temperature is September (27.8°C).

  • Average low temperature in September: 27.1°C

The month with the highest average low temperature is April (28.3°C).
The coldest month (with the lowest average low temperature) is August (27°C).

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Average pressure in September
Roto, Cook Islands

Average pressure in September - Roto, Cook Islands
  • Average pressure in September: 1011.5mbar

The months with the highest atmospheric pressure are August and September (1011.5mbar).
The month with the lowest atmospheric pressure is January (1008.1mbar).

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Average wind speed in September
Roto, Cook Islands

Average wind speed in September - Roto, Cook Islands
  • Average wind speed in September: 25km/h

The windiest month (with the highest average wind speed) is August (26km/h).
The calmest month (with the lowest average wind speed) is April (17.4km/h).

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Average humidity in September
Roto, Cook Islands

Average humidity in September - Roto, Cook Islands
  • Average humidity in September: 77%

The months with the highest relative humidity are June, July, August and September (77%).
The month with the lowest relative humidity is December (74%).

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Average rainfall in September
Roto, Cook Islands

Average rainfall in September - Roto, Cook Islands
  • Average rainfall in September: 78mm

The wettest month (with the highest rainfall) is January (268mm).
The driest month (with the least rainfall) is September (78mm).

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Average rainfall days in September
Roto, Cook Islands

Average rainfall days in September - Roto, Cook Islands
  • Average rainfall days in September: 21.6 days

The month with the highest number of rainy days is March (28.7 days).
The month with the least rainy days is September (21.6 days).

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Average daylight in September /
Average sunshine in September
Roto, Cook Islands

Average daylight in September / Average sunshine in September - Roto, Cook Islands
  • Average daylight in September: 12h and 3min

The month with the longest days is December (Average daylight: 12h and 45min).
The month with the shortest days is June (Average daylight: 11h and 30min).

  • Average sunshine in September: 8h and 30min

The month with the most sunshine is September (Average sunshine: 8h and 30min).
The month with the least sunshine is January (Average sunshine: 7h and 36min).

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Average sunshine days in September
Roto, Cook Islands

Average sunshine days in September - Roto, Cook Islands
  • Average sunshine days in September: 5.6 days

The month with the most sunshine days is September (5.6 days).
The month with the least sunshine days is February (0.4 days).

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Average UV index in September
Roto, Cook Islands

Average UV index in September - Roto, Cook Islands
  • Average UV index in September: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

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Average cloud cover in September
Roto, Cook Islands

Average cloud cover in September - Roto, Cook Islands
  • Average cloud cover in September: 41

The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are May and September (Cloud cover 41).

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Average visibility in September
Roto, Cook Islands

Average visibility in September - Roto, Cook Islands
  • Average visibility in September: 10km

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and February (9km).

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