September weather forecast
Wailuku, HI

englishespañol中文
Share

Weather in September

In September, Wailuku experiences similar weather to August, with a small decrease in temperatures and steady rainfall. The month's noteworthy pattern is the slight decrease in rainfall to 0.39" (10mm) over an average of 8.1 days. Despite the approach of fall, Wailuku remains warm and welcoming, continuing to attract tourists.

Temperature

Wailuku registers the highest average temperatures during the month of September, with peaks of 79.9°F (26.6°C) and lows of 76.1°F (24.5°C).

Humidity

In Wailuku, the average relative humidity in September is 75%.

Rainfall

In September, the rain falls for 8.1 days. Throughout September, 0.39" (10mm) of precipitation is accumulated. In Wailuku, during the entire year, the rain falls for 103.4 days and collects up to 6.57" (167mm) of precipitation.

Daylight

The average length of the day in September in Wailuku is 12h and 15min.
On the first day of September, sunrise is at 6:10 am and sunset at 6:41 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 6:14 pm HST.

Sunshine

In Wailuku, the average sunshine in September is 9.6h.

UV index

The months with the highest UV index in Wailuku, Hawaii, are July through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.
Note: A daily high UV index of 7 in September leads to these guidelines:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
[Resources]

Frequently asked questions

What is the warmest month in Wailuku?

September is the warmest month, with the temperature often reaching an average high of 79.9°F (26.6°C) and an average low of 76.1°F (24.5°C).

What is the average September temperature in Wailuku?

The high-temperature, in September, in Wailuku, is 79.9°F (26.6°C), while the low-temperature averages to 76.1°F (24.5°C).

What is the average humidity in September in Wailuku?

In Wailuku, the average relative humidity in September is 75%.

How much does it rain in Wailuku in September?

In Wailuku, in September, during 8.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

How many hours of daylight does Wailuku have in September?

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

What time are sunrise and sunset in September in Wailuku?

On the first day of September in Wailuku, Hawaii, sunrise is at 6:10 am and sunset at 6:41 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 6:14 pm HST.

How many hours of sunshine does Wailuku have in September?

In September, the average sunshine duration in Wailuku is 9.6h.

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

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

What is the UV index intensity in September in Wailuku?

In Wailuku, Hawaii, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.

Average temperature in September
Wailuku, HI

Average temperature in September - Wailuku, HI
  • Average high temperature in September: 79.9°F

The warmest month (with the highest average high temperature) is September (79.9°F).
The month with the lowest average high temperature is February (73.9°F).

  • Average low temperature in September: 76.1°F

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

[Resources]

Average pressure in September
Wailuku, HI

Average pressure in September - Wailuku, 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).

[Resources]

Average wind speed in September
Wailuku, HI

Average wind speed in September - Wailuku, HI
  • Average wind speed in September: 11.9mph

The windiest month (with the highest average wind speed) is June (13.6mph).
The calmest month (with the lowest average wind speed) is January (10.4mph).

[Resources]

Average humidity in September
Wailuku, HI

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

The months with the highest relative humidity are July and August (76%).
The months with the lowest relative humidity are January and February (74%).

[Resources]

Average rainfall in September
Wailuku, HI

Average rainfall in September - Wailuku, HI
  • Average rainfall in September: 0.39"

The wettest months (with the highest rainfall) are March and December (0.87").
The driest month (with the least rainfall) is June (0.2").

[Resources]

Average rainfall days in September
Wailuku, HI

Average rainfall days in September - Wailuku, HI
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is June (6.6 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Wailuku, 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 4min

The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

[Resources]

Average sunshine days in September
Wailuku, HI

Average sunshine days in September - Wailuku, HI
  • Average sunshine days in September: 17.3 days

The month with the most sunshine days is June (19.9 days).
The month with the least sunshine days is March (15.2 days).

[Resources]

Average UV index in September
Wailuku, HI

Average UV index in September - Wailuku, 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
Wailuku, HI

Average cloud cover in September - Wailuku, HI
  • Average cloud cover in September: 21

The month with the most cloud cover is March (Cloud cover 30).
The months with the least cloud cover are June and September (Cloud cover 21).

[Resources]

Average visibility in September
Wailuku, HI

Average visibility in September - Wailuku, 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]

Wailuku, Hawaii, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location