September weather forecast
Kahului, HI

Weather in September

The first month of the autumn, September, is still a warm month in Kahului, Hawaii, with an average temperature ranging between min 76.1°F (24.5°C) and max 79.9°F (26.6°C).

Temperature

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

Humidity

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

Rainfall

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

Ocean temperature

With an average ocean temperature of 80.1°F (26.7°C), September is the month with the warmest seawater in Kahului.
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 the month, sunrise is at 6:09 am and sunset at 6:41 pm. On the last day of September, in Kahului, sunrise is at 6:16 am and sunset at 6:14 pm HST.

Sunshine

In September, the average sunshine is 9.6h.

UV index

July through October, with an average maximum UV index of 7, are months with the highest UV index in Kahului. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 7 in September transform into the following instructions:
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 reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the warmest month in Kahului?

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

What is the temperature in September in Kahului?

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

What is the average humidity in September in Kahului?

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

How much does it rain in Kahului in September?

In Kahului, Hawaii, during September, the rain falls for 8.1 days and regularly aggregates up to 0.39" (10mm) of precipitation.

When is the ocean warmest in Kahului?

With an average ocean temperature of 80.1°F (26.7°C), September is the month with the warmest seawater in Kahului, Hawaii.

What is the water temperature in September in Kahului?

In September, the average ocean temperature in Kahului, Hawaii, is 80.1°F (26.7°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.

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

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

When is the sunrise / sunset in September in Kahului?

On the first day of September in Kahului, sunrise is at 6:09 am and sunset at 6:41 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 6:14 pm HST.

How long on average sun shines in September in Kahului?

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

When is the highest UV index in Kahului?

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

What is the UV index reading in September in Kahului?

The average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.

Average temperature in September
Kahului, HI

Average temperature in September - Kahului, 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).

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Average pressure in September
Kahului, HI

Average pressure in September - Kahului, 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
Kahului, HI

Average wind speed in September - Kahului, 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).

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Average humidity in September
Kahului, HI

Average humidity in September - Kahului, 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%).

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Average rainfall in September
Kahului, HI

Average rainfall in September - Kahului, 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").

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Average rainfall days in September
Kahului, HI

Average rainfall days in September - Kahului, 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).

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Average sea temperature in September
Kahului, HI

Average sea temperature in September - Kahului, HI
  • Average sea temperature in September: 80°F

The best month for swimming (with the highest average sea temperature) is September (80°F).
The coldest month (with the lowest average sea temperature) is March (75.6°F).

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

Average daylight in September / Average sunshine in September - Kahului, 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 36min

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).

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Average sunshine days in September
Kahului, HI

Average sunshine days in September - Kahului, 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).

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Average UV index in September
Kahului, HI

Average UV index in September - Kahului, 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).

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Average cloud cover in September
Kahului, HI

Average cloud cover in September - Kahului, 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).

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Average visibility in September
Kahului, HI

Average visibility in September - Kahului, 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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