September weather forecast
Papaikou, HI

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Weather in September

September, the first month of the autumn in Papaikou, is also a moderately hot month, with an average temperature fluctuating between 75.2°F (24°C) and 70°F (21.1°C).

Temperature

Papaikou notes an average high-temperature of a still moderately hot 75.2°F (24°C) in September, displaying minor variation from August. September nights witness a slight temperature decrease, averaging at an agreeable 70°F (21.1°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Papaikou, during September, the rain falls for 19.2 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Papaikou, during the entire year, the rain falls for 227.7 days and collects up to 27.83" (707mm) of precipitation.

Ocean temperature

September is the month with the warmest seawater in Papaikou, with an average ocean temperature of 79.3°F (26.3°C).
Note: Swimming, diving, and other water activities in the temperature range of 77°F (25°C) to 84.2°F (29°C) are perceived as very enjoyable and comfortable for prolonged durations.

Daylight

In Papaikou, the average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 6:05 am and sunset at 6:35 pm. On the last day of September, in Papaikou, sunrise is at 6:11 am and sunset at 6:08 pm HST.

Sunshine

In September, the average sunshine is 8.8h.

UV index

The months with the highest UV index are May through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Note! The Sun's UV radiation gets intensified with the reflection from sand and water.
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Frequently asked questions

What is the temperature in September in Papaikou?

Papaikou in September has an average high-temperature of 75.2°F (24°C) and an average low-temperature of 70°F (21.1°C).

What is the average humidity in September in Papaikou?

In Papaikou, Hawaii, the average relative humidity in September is 79%.

How many days does it rain in September in Papaikou?

In Papaikou, in September, it is raining for 19.2 days, with typically 1.81" (46mm) of accumulated precipitation.

What month is the ocean warmest in Papaikou?

September is the month with the warmest seawater, with an average ocean temperature of 79.3°F (26.3°C).

How warm is the water in September in Papaikou?

In Papaikou, in September, the average water temperature is 79.3°F (26.3°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Papaikou have in September?

In Papaikou, the average day length in September is 12h and 14min.

What time are sunrise and sunset in September in Papaikou?

In September, on the first day of the month, sunrise is at 6:05 am and sunset at 6:35 pm. On the last day of the month, in Papaikou, sunrise is at 6:11 am and sunset at 6:08 pm HST.

How many hours of sunshine does Papaikou have in September?

In Papaikou, Hawaii, the average sunshine duration in September is 8.8h.

What are the months with the highest UV index in Papaikou?

The months with the highest UV index are May through December, with an average maximum UV index of 6.

What is the UV index intensity in September in Papaikou?

The average daily maximum UV index in September in Papaikou is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Papaikou, HI

Average temperature in September - Papaikou, HI
  • Average high temperature in September: 75.2°F

The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is March (69.6°F).

  • Average low temperature in September: 70°F

The month with the highest average low temperature is September (70°F).
The coldest month (with the lowest average low temperature) is March (64°F).

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Average pressure in September
Papaikou, HI

Average pressure in September - Papaikou, HI
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

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Average wind speed in September
Papaikou, HI

Average wind speed in September - Papaikou, HI
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is August (7.6mph).
The calmest month (with the lowest average wind speed) is October (6.7mph).

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Average humidity in September
Papaikou, HI

Average humidity in September - Papaikou, HI
  • Average humidity in September: 79%

The month with the highest relative humidity is March (80%).
The months with the lowest relative humidity are January, May, June and July (78%).

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Average rainfall in September
Papaikou, HI

Average rainfall in September - Papaikou, HI
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is February (3.78").
The driest month (with the least rainfall) is June (1.1").

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Average rainfall days in September
Papaikou, HI

Average rainfall days in September - Papaikou, HI
  • Average rainfall days in September: 19.2 days

The month with the highest number of rainy days is March (22.9 days).
The month with the least rainy days is January (13.3 days).

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Average sea temperature in September
Papaikou, HI

Average sea temperature in September - Papaikou, HI
  • Average sea temperature in September: 79.3°F

The best month for swimming (with the highest average sea temperature) is September (79.3°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

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Average daylight in September /
Average sunshine in September
Papaikou, HI

Average daylight in September / Average sunshine in September - Papaikou, HI
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in September
Papaikou, HI

Average sunshine days in September - Papaikou, HI
  • Average sunshine days in September: 2.5 days

The month with the most sunshine days is January (12.1 days).
The month with the least sunshine days is August (1.8 days).

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Average UV index in September
Papaikou, HI

Average UV index in September - Papaikou, HI
  • Average UV index in September: 6

The months with the highest UV index are May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March and April (UV index 5).

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Average cloud cover in September
Papaikou, HI

Average cloud cover in September - Papaikou, HI
  • Average cloud cover in September: 29

The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is January (Cloud cover 26).

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Average visibility in September
Papaikou, HI

Average visibility in September - Papaikou, HI
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Papaikou, Hawaii, USA

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