September weather forecast
Hanalei, HI

The vast Taro farm fields in the valley of Hanalei, Hawaii, with beautiful cloudy skies and mountains
The vast Taro farm fields in the valley of Hanalei, Hawaii, with beautiful cloudy skies and mountains

Weather in September

September, the first month of the autumn in Hanalei, is still a warm month, with an average temperature varying between 79.7°F (26.5°C) and 75.9°F (24.4°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 75.9°F (24.4°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In September, in Hanalei, Hawaii, the rain falls for 18.7 days. Throughout September, 1.54" (39mm) of precipitation is accumulated. Throughout the year, in Hanalei, there are 218.4 rainfall days, and 22.13" (562mm) of precipitation is accumulated.

Ocean temperature

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

Daylight

The average length of the day in September in Hanalei is 12h and 16min.
On the first day of the month, sunrise is at 6:20 am and sunset at 6:54 pm. On the last day of September, sunrise is at 6:29 am and sunset at 6:26 pm HST.

Sunshine

In Hanalei, the average sunshine in September is 8.7h.

UV index

The month with the highest UV index in Hanalei is September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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.
[Resources]

FAQ

What is the warmest month in Hanalei?

With an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 75.9°F (24.4°C), September is the warmest month in Hanalei, Hawaii.

What is the temperature in September in Hanalei?

In Hanalei, in September, the average high-temperature is 79.7°F (26.5°C), and the average low-temperature is 75.9°F (24.4°C).

What is the average humidity in September in Hanalei?

In Hanalei, Hawaii, the average relative humidity in September is 76%.

How many days does it rain in September in Hanalei?

In September, in Hanalei, Hawaii, the rain falls for 18.7 days. Throughout September, 1.54" (39mm) of precipitation is accumulated.

When is the ocean warmest in Hanalei?

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

What is the water temperature in September in Hanalei?

In September, the average ocean temperature in Hanalei, Hawaii, is 80.6°F (27°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

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

In September, the average day length is 12h and 16min.

What time are sunrise and sunset in September in Hanalei?

On the first day of September in Hanalei, sunrise is at 6:20 am and sunset at 6:54 pm. On the last day of the month, sunrise is at 6:29 am and sunset at 6:26 pm HST.

How many hours of sunshine does Hanalei have in September?

The average sunshine duration in September is 8.7h.

What is the month with the highest UV index in Hanalei?

The month with the highest UV index in Hanalei is September, with an average maximum UV index of 7.

How high is the UV index in September in Hanalei?

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

Average temperature in September
Hanalei, HI

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

The warmest month (with the highest average high temperature) is September (79.7°F).
The months with the lowest average high temperature are February and March (73.2°F).

  • Average low temperature in September: 75.9°F

The month with the highest average low temperature is September (75.9°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).

[Resources]

Average pressure in September
Hanalei, HI

Average pressure in September - Hanalei, HI
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is April (30.07"Hg).
The months with the lowest atmospheric pressure are September and October (29.98"Hg).

[Resources]

Average wind speed in September
Hanalei, HI

Average wind speed in September - Hanalei, HI
  • Average wind speed in September: 11.1mph

The windiest month (with the highest average wind speed) is July (12.3mph).
The calmest month (with the lowest average wind speed) is January (10mph).

[Resources]

Average humidity in September
Hanalei, HI

Average humidity in September - Hanalei, HI
  • Average humidity in September: 76%

The months with the highest relative humidity are June, July, August, October and December (77%).
The month with the lowest relative humidity is January (75%).

[Resources]

Average rainfall in September
Hanalei, HI

Average rainfall in September - Hanalei, HI
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is March (2.52").
The driest month (with the least rainfall) is April (1.3").

[Resources]

Average rainfall days in September
Hanalei, HI

Average rainfall days in September - Hanalei, HI
  • Average rainfall days in September: 18.7 days

The month with the highest number of rainy days is August (21.1 days).
The month with the least rainy days is January (12.5 days).

[Resources]

Average sea temperature in September
Hanalei, HI

Average sea temperature in September - Hanalei, 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
Hanalei, HI

Average daylight in September / Average sunshine in September - Hanalei, HI
  • Average daylight in September: 12h and 16min

The month with the longest days is June (Average daylight: 13h and 28min).
The month with the shortest days is December (Average daylight: 10h and 48min).

  • Average sunshine in September: 8h and 42min

The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).

[Resources]

Average sunshine days in September
Hanalei, HI

Average sunshine days in September - Hanalei, HI
  • Average sunshine days in September: 5.3 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is August (2.9 days).

[Resources]

Average UV index in September
Hanalei, HI

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

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

[Resources]

Average cloud cover in September
Hanalei, HI

Average cloud cover in September - Hanalei, HI
  • Average cloud cover in September: 38

The month with the most cloud cover is March (Cloud cover 47).
The months with the least cloud cover are January and September (Cloud cover 38).

[Resources]

Average visibility in September
Hanalei, HI

Average visibility in September - Hanalei, 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