September weather forecast
Kihei, HI

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Weather in September

September in Kihei marks the transition from summer to autumn, mirrored in a subtle shift in weather. Though there is a modest increase in rainfall to 0.39" (10mm), September still allows numerous opportunities for outdoor activities. Experiencing a slight drop from the summer heat, the climate remains warm, conducive to enjoying Hawaii's stunning sunsets. The steady days of sunshine enhance the captivating beauty of this month.

Temperature

September is Kihei's warmest month, registering average high temperatures of 79.9°F (26.6°C) and lows of 76.1°F (24.5°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

In Kihei, during September, the rain falls for 8.1 days and regularly aggregates up to 0.39" (10mm) of precipitation. Throughout the year, there are 103.4 rainfall days, and 6.57" (167mm) of precipitation is accumulated.

Ocean temperature

The month with the warmest seawater is September, with an average ocean temperature of 80.1°F (26.7°C).
Note: For any water activity, surface water temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed perfect and extremely pleasing for enduring enjoyment.

Daylight

The average length of the day in September 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 Kihei, sunrise is at 6:16 am and sunset at 6:14 pm HST.

Sunshine

The average sunshine in September is 9.6h.

UV index

July through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.
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Frequently asked questions

What is the hottest time of year in Kihei?

The warmest period in Kihei, Hawaii, tends to be September, when average temperatures fluctuate between a high of 79.9°F (26.6°C) and a low of 76.1°F (24.5°C).

What is the usual temperature for Kihei in September?

During September, Kihei experiences an average high-temperature of 79.9°F (26.6°C) and a low-temperature of 76.1°F (24.5°C).

What is the average humidity in September in Kihei?

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

How much does it rain in Kihei in September?

In Kihei, Hawaii, in September, it is raining for 8.1 days, with typically 0.39" (10mm) of accumulated precipitation.

What is the month with the warmest ocean in Kihei?

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

What is the ocean temperature in September in Kihei?

In September, the average ocean temperature is 80.1°F (26.7°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 Kihei?

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

When are sunrise and sunset in September in Kihei?

On the first day of September in Kihei, 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 Kihei?

The average sunshine duration in September in Kihei, Hawaii, is 9.6h.

When is the highest UV index in Kihei?

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

What is the UV index intensity in September in Kihei?

The average daily maximum UV index in September in Kihei 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
Kihei, HI

Average temperature in September - Kihei, 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
Kihei, HI

Average pressure in September - Kihei, 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
Kihei, HI

Average wind speed in September - Kihei, 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
Kihei, HI

Average humidity in September - Kihei, 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
Kihei, HI

Average rainfall in September - Kihei, 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
Kihei, HI

Average rainfall days in September - Kihei, 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
Kihei, HI

Average sea temperature in September - Kihei, 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
Kihei, HI

Average daylight in September / Average sunshine in September - Kihei, HI
  • Average daylight in September: 12h and 1min

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).

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Average sunshine days in September
Kihei, HI

Average sunshine days in September - Kihei, 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
Kihei, HI

Average UV index in September - Kihei, 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
Kihei, HI

Average cloud cover in September - Kihei, 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
Kihei, HI

Average visibility in September - Kihei, 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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Kihei, Hawaii, USA

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