September weather forecast
Kaunakakai, HI

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Weather in September

September weather in Kaunakakai, Hawaii, echoes August, maintaining both high temperatures and significant daylight hours. Interestingly, the average wind speed drops to 11.8mph (19km/h) from 13.5mph (21.7km/h) in August. This decrease in wind activity contributes to a relaxed and pleasant climate. The warm, steady weather continues to invite outdoor exploration and beach activities. Sea temperature reaches its peak, setting ideal conditions for water-based activities.

Temperature

Temperatures reach their maximum during August and September, recording an average high-temperature of 80.2°F (26.8°C).

Humidity

The average relative humidity in September in Kaunakakai is 75%.

Rainfall

In Kaunakakai, Hawaii, in September, it is raining for 10.1 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 126.4 rainfall days, and 9.84" (250mm) of precipitation is accumulated.

Ocean temperature

The month with the warmest seawater in Kaunakakai, Hawaii, is September, with an average ocean temperature of 80.2°F (26.8°C).
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are ideal for swimming, diving, and other activities, ensuring comfort and enjoyment for lengthened periods.

Daylight

In Kaunakakai, the average length of the day in September is 12h and 15min.
On the first day of the month, sunrise is at 6:11 am and sunset at 6:43 pm. On the last day of September, in Kaunakakai, sunrise is at 6:19 am and sunset at 6:16 pm HST.

Sunshine

The average sunshine in September in Kaunakakai is 9.5h.

UV index

June through October, with an average maximum UV index of 7, are months with the highest UV index in Kaunakakai. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 7 in September translates into this advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the hottest in Kaunakakai?

Temperatures reach their maximum during August and September, recording an average high-temperature of 80.2°F (26.8°C).

What is the usual temperature for Kaunakakai in September?

In Kaunakakai, in September, the average high-temperature is 80.2°F (26.8°C), and the average low-temperature is 77.2°F (25.1°C).

What is the average humidity in September in Kaunakakai?

The average relative humidity in September is 75%.

How many days does it rain in September in Kaunakakai?

In Kaunakakai, Hawaii, in September, it is raining for 10.1 days, with typically 0.75" (19mm) of accumulated precipitation.

What is the month with the warmest ocean in Kaunakakai?

With an average ocean temperature of 80.2°F (26.8°C), September is the month with the warmest seawater.

What is the water temperature in September in Kaunakakai?

In Kaunakakai, the average seawater temperature in September is 80.2°F (26.8°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 Kaunakakai have in September?

The average day length in September is 12h and 15min.

What time are sunrise and sunset in September in Kaunakakai?

In September, on the first day of the month, sunrise is at 6:11 am and sunset at 6:43 pm. On the last day of the month, sunrise is at 6:19 am and sunset at 6:16 pm HST.

How many hours of sunshine does Kaunakakai have in September?

In September, the average sunshine duration in Kaunakakai, Hawaii, is 9.5h.

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

June through October, with an average maximum UV index of 7, are months with the highest UV index in Kaunakakai.

What is the UV index intensity in September in Kaunakakai?

In September, the average daily maximum UV index in Kaunakakai, Hawaii, is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from exposure to Sun's UV rays.

Average temperature in September
Kaunakakai, HI

Average temperature in September - Kaunakakai, HI
  • Average high temperature in September: 80.2°F

The warmest months (with the highest average high temperature) are August and September (80.2°F).
The month with the lowest average high temperature is February (74.3°F).

  • Average low temperature in September: 77.2°F

The months with the highest average low temperature are September and October (77.2°F).
The coldest month (with the lowest average low temperature) is March (71.2°F).

Average pressure in September
Kaunakakai, HI

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

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

Average wind speed in September
Kaunakakai, HI

Average wind speed in September - Kaunakakai, HI
  • Average wind speed in September: 11.8mph

The windiest month (with the highest average wind speed) is July (13.9mph).
The calmest month (with the lowest average wind speed) is January (10.8mph).

Average humidity in September
Kaunakakai, HI

Average humidity in September - Kaunakakai, HI
  • Average humidity in September: 75%

The months with the highest relative humidity are April, May, June, July and August (76%).
The months with the lowest relative humidity are January and November (74%).

Average rainfall in September
Kaunakakai, HI

Average rainfall in September - Kaunakakai, HI
  • Average rainfall in September: 0.75"

The wettest month (with the highest rainfall) is March (1.3").
The driest month (with the least rainfall) is July (0.31").

Average rainfall days in September
Kaunakakai, HI

Average rainfall days in September - Kaunakakai, HI
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is March (13.2 days).
The month with the least rainy days is July (8.5 days).

Average sea temperature in September
Kaunakakai, HI

Average sea temperature in September - Kaunakakai, HI
  • Average sea temperature in September: 80.2°F

The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (75.6°F).

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

Average daylight in September / Average sunshine in September - Kaunakakai, HI
  • Average daylight in September: 12h and 2min

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

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).

Average sunshine days in September
Kaunakakai, HI

Average sunshine days in September - Kaunakakai, HI
  • Average sunshine days in September: 12.7 days

The month with the most sunshine days is July (16.1 days).
The month with the least sunshine days is November (10.8 days).

Average UV index in September
Kaunakakai, HI

Average UV index in September - Kaunakakai, HI
  • Average UV index in September: 7

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

Average cloud cover in September
Kaunakakai, HI

Average cloud cover in September - Kaunakakai, HI
  • Average cloud cover in September: 23

The months with the most cloud cover are February and March (Cloud cover 30).
The month with the least cloud cover is September (Cloud cover 23).

Average visibility in September
Kaunakakai, HI

Average visibility in September - Kaunakakai, 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).

Kaunakakai, Hawaii, USA

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