September weather forecast
Waikapu, HI

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Weather in September

September, the first month of the autumn in Waikapu, is still a warm month, with temperature in the range of an average high of 79.9°F (26.6°C) and an average low of 76.1°F (24.5°C).

Temperature

In Waikapu, temperatures reach their average annual highs in September, measuring 79.9°F (26.6°C) and a minimum average of 76.1°F (24.5°C).

Humidity

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

Rainfall

In Waikapu, in September, during 8.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Waikapu, 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 Waikapu is 12h and 15min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:41 pm. On the last day of September, in Waikapu, sunrise is at 6:17 am and sunset at 6:14 pm HST.

Sunshine

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

UV index

The months with the highest UV index are July through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
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Frequently asked questions

What is the warmest month in Waikapu?

September is the warmest month in Waikapu, 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 Waikapu?

Waikapu in September has 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 average humidity in September in Waikapu?

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

How many days does it rain in September in Waikapu?

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

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

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

When is the sunrise / sunset in September in Waikapu?

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

How many hours of sunshine does Waikapu have in September?

The average sunshine duration in September in Waikapu is 9.6h.

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

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

How high is the UV index in September in Waikapu?

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

Average temperature in September
Waikapu, HI

Average temperature in September - Waikapu, 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
Waikapu, HI

Average pressure in September - Waikapu, 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
Waikapu, HI

Average wind speed in September - Waikapu, 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
Waikapu, HI

Average humidity in September - Waikapu, 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
Waikapu, HI

Average rainfall in September - Waikapu, 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
Waikapu, HI

Average rainfall days in September - Waikapu, 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 daylight in September /
Average sunshine in September
Waikapu, HI

Average daylight in September / Average sunshine in September - Waikapu, 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).

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Average sunshine days in September
Waikapu, HI

Average sunshine days in September - Waikapu, 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
Waikapu, HI

Average UV index in September - Waikapu, 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
Waikapu, HI

Average cloud cover in September - Waikapu, 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
Waikapu, HI

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

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