September weather forecast
Kapalua, HI

Weather in September

The first month of the autumn, September, is also a moderately hot month in Kapalua, Hawaii, with temperature in the range of an average low of 76.3°F (24.6°C) and an average high of 79.7°F (26.5°C).

Temperature

September is the warmest month, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 76.3°F (24.6°C).

Humidity

The months with the lowest humidity are January through March, September and November, with an average relative humidity of 75%.

Rainfall

In Kapalua, during September, the rain falls for 8.5 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, there are 112.6 rainfall days, and 7.91" (201mm) of precipitation is accumulated.

Ocean temperature

The months with the warmest seawater in Kapalua are September and October, with an average ocean temperature of 80.6°F (27°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In September, the average length of the day is 12h and 15min.
On the first day of September, sunrise is at 6:10 am and sunset at 6:42 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 6:15 pm HST.

Sunshine

In September, the average sunshine is 9.4h.

UV index

The months with the highest UV index are July through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
[Resources]

FAQ

What is the warmest month in Kapalua?

September is the warmest month in Kapalua, Hawaii, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 76.3°F (24.6°C).

What is the temperature in September in Kapalua?

In September, the average high-temperature is 79.7°F (26.5°C), and the average low-temperature is 76.3°F (24.6°C).

What is the least humid month in Kapalua?

January through March, September and November, with an average relative humidity of 75%, are the least humid months in Kapalua.

What is the average humidity in September in Kapalua?

The average relative humidity in September is 75%.

How many days does it rain in September in Kapalua?

In Kapalua, in September, it is raining for 8.5 days, with typically 0.43" (11mm) of accumulated precipitation.

What are the months with the warmest ocean in Kapalua?

September and October, with an average ocean temperature of 80.6°F (27°C), are months with the warmest seawater.

What is the water temperature in September in Kapalua?

In Kapalua, Hawaii, in September, the average water temperature is 80.6°F (27°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

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

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

When are sunrise and sunset in September in Kapalua?

In September, on the first day of the month, sunrise is at 6:10 am and sunset at 6:42 pm. On the last day of the month, in Kapalua, Hawaii, sunrise is at 6:17 am and sunset at 6:15 pm HST.

How long on average sun shines in September in Kapalua?

In Kapalua, Hawaii, the average sunshine duration in September is 9.4h.

When is the highest UV index in Kapalua?

July through October, with an average maximum UV index of 7, are months with the highest UV index in Kapalua, Hawaii.

What is the UV index intensity in September in Kapalua?

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

Average temperature in September
Kapalua, HI

Average temperature in September - Kapalua, HI
  • Average high temperature in September: 79.7°F

The warmest month (with the highest average high temperature) is September (79.7°F).
The month with the lowest average high temperature is February (73.9°F).

  • Average low temperature in September: 76.3°F

The months with the highest average low temperature are August and October (76.5°F).
The coldest month (with the lowest average low temperature) is March (70.7°F).

[Resources]

Average pressure in September
Kapalua, HI

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

The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

[Resources]

Average wind speed in September
Kapalua, HI

Average wind speed in September - Kapalua, 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 (10.6mph).

[Resources]

Average humidity in September
Kapalua, HI

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

The month with the highest relative humidity is July (77%).
The months with the lowest relative humidity are January, February, March, September and November (75%).

[Resources]

Average rainfall in September
Kapalua, HI

Average rainfall in September - Kapalua, HI
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is March (1.1").
The driest month (with the least rainfall) is July (0.35").

[Resources]

Average rainfall days in September
Kapalua, HI

Average rainfall days in September - Kapalua, HI
  • Average rainfall days in September: 8.5 days

The month with the highest number of rainy days is March (13.4 days).
The month with the least rainy days is November (7.7 days).

[Resources]

Average sea temperature in September
Kapalua, HI

Average sea temperature in September - Kapalua, HI
  • Average sea temperature in September: 81°F

The best months for swimming (with the highest average sea temperature) are September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).

[Resources]

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

Average daylight in September / Average sunshine in September - Kapalua, HI
  • Average daylight in September: 12h and 15min

The month with the longest days is June (Average daylight: 13h and 23min).
The month with the shortest days is December (Average daylight: 10h and 53min).

  • Average sunshine in September: 9h and 24min

The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

[Resources]

Average sunshine days in September
Kapalua, HI

Average sunshine days in September - Kapalua, HI
  • Average sunshine days in September: 18.3 days

The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is March (12.6 days).

[Resources]

Average UV index in September
Kapalua, HI

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

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

[Resources]

Average cloud cover in September
Kapalua, HI

Average cloud cover in September - Kapalua, HI
  • Average cloud cover in September: 25

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is September (Cloud cover 25).

[Resources]

Average visibility in September
Kapalua, HI

Average visibility in September - Kapalua, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location