September weather forecast
Koror, Palau

Weather in September

The first month of the autumn, September, is still a warm month in Koror, Palau, with average temperature fluctuating between 28°C (82.4°F) and 28.8°C (83.8°F).

Temperature

In Koror, the average high-temperature in September is practically the same as in August - a still warm 28.8°C (83.8°F). In Koror, the average low-temperature is 28°C (82.4°F).

Heat index

The average heat index is calculated to be a tropical 33.4°C (92.1°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, wind, pregnancy). 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Koror, during 23.4 rainfall days, 182mm (7.17") of precipitation is typically accumulated. Throughout the year, there are 303.8 rainfall days, and 2074mm (81.65") of precipitation is accumulated.

Sea temperature

April through December, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Koror.
Note: 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.

Daylight

In September, the average length of the day in Koror is 12.2h.

Sunshine

In Koror, the average sunshine in September is 8.5h.

UV index

Months with the lowest UV index in Koror are January, September and November, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Koror?

The average high-temperature, in September, in Koror, Palau, is 28.8°C (83.8°F), while the average low-temperature is 28°C (82.4°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is calculated to be 33.4°C (92.1°F).

What is the average humidity in September in Koror?

In Koror, Palau, the average relative humidity in September is 76%.

How much does it rain in Koror in September?

In September, in Koror, the rain falls for 23.4 days. Throughout September, 182mm (7.17") of precipitation is accumulated.

What months are the sea warmest in Koror?

April through December, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater.

How warm is the water in September in Koror?

In September, the average sea temperature in Koror, Palau, is 29°C (84.2°F). 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.

How many hours of daylight does Koror have in September?

In September, the average length of the day in Koror is 12.2h.

How many hours of sunshine does Koror have in September?

The average sunshine in September is 8.5h.

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

January, September and November, with an average maximum UV index of 6, are months with the lowest UV index in Koror.

What is the UV index reading in September in Koror?

In Koror, Palau, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Koror, Palau

Average temperature in September - Koror, Palau
  • Average high temperature in September: 28.8°C

The warmest month (with the highest average high temperature) is May (29.3°C).
Months with the lowest average high temperature are February and March (28.3°C).

  • Average low temperature in September: 28°C

The month with the highest average low temperature is November (28.4°C).
The coldest month (with the lowest average low temperature) is February (27.5°C).

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Average pressure in September
Koror, Palau

Average pressure in September - Koror, Palau
  • Average pressure in September: 1009mbar

Months with the highest atmospheric pressure are February and March (1009.6mbar).
The month with the lowest atmospheric pressure is December (1007.9mbar).

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Average wind speed in September
Koror, Palau

Average wind speed in September - Koror, Palau
  • Average wind speed in September: 19.6km/h

The windiest month (with the highest average wind speed) is February (24.5km/h).
The calmest month (with the lowest average wind speed) is June (13.5km/h).

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Average humidity in September
Koror, Palau

Average humidity in September - Koror, Palau
  • Average humidity in September: 76%

Months with the highest relative humidity are January, February, March and April (78%).
The month with the lowest relative humidity is June (75%).

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Average rainfall in September
Koror, Palau

Average rainfall in September - Koror, Palau
  • Average rainfall in September: 182mm

The wettest month (with the highest rainfall) is June (209mm).
The driest month (with the least rainfall) is March (119mm).

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Average rainfall days in September
Koror, Palau

Average rainfall days in September - Koror, Palau
  • Average rainfall days in September: 23.4 days

Months with the highest number of rainy days are January and December (27.8 days).
The month with the least rainy days is September (23.4 days).

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Average sea temperature in September
Koror, Palau

Average sea temperature in September - Koror, Palau
  • Average sea temperature in September: 29°C

The best months for swimming (with the highest average sea temperature) are April, May, June, July, August, September, October, November and December (29°C).
The coldest months (with the lowest average sea temperature) are January, February and March (28°C).

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Average daylight in September /
Average sunshine in September
Koror, Palau

Average daylight in September / Average sunshine in September - Koror, Palau
  • Average daylight in September: 12.2h

Months with the longest days are May, June and July (Average daylight: 12.5h).
Months with the shortest days are January and December (Average daylight: 11.7h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is May (Average sunshine: 9.7h).
The month with the least sunshine is December (Average sunshine: 6.1h).

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Average sunshine days in September
Koror, Palau

Average sunshine days in September - Koror, Palau
  • Average sunshine days in September: 5.7 days

The month with the most sunshine days is August (5.9 days).
Months with the least sunshine days are February and December (1.6 days).

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Average UV index in September
Koror, Palau

Average UV index in September - Koror, Palau
  • Average UV index in September: 6

Months with the highest UV index are February, March, April, May, June, July, August, October and December (UV index 7).
Months with the lowest UV index are January, September and November (UV index 6).

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Average cloud cover in September
Koror, Palau

Average cloud cover in September - Koror, Palau
  • Average cloud cover in September: 48

The month with the most cloud cover is July (Cloud cover 49).
The month with the least cloud cover is March (Cloud cover 43).

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Average visibility in September
Koror, Palau

Average visibility in September - Koror, Palau
  • Average visibility in September: 9km

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

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