September weather forecast
Waikapu, HI

Weather in September

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

Temperature

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

Humidity

In September, the average relative humidity is 75%.

Rainfall

In Waikapu, during 8.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, there are 103.4 rainfall days, and 6.57" (167mm) of precipitation is accumulated.

Daylight

In Waikapu, Hawaii, the average length of the day in September is 12.3h.

Sunshine

In Waikapu, 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. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. A wide-brim hat offers excellent sun protection for 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.
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FAQ

What is the warmest month in Waikapu?

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

What is the average humidity in September in Waikapu?

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

How much does it rain in Waikapu in September?

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?

In Waikapu, Hawaii, the average length of the day in September is 12.3h.

How long on average sun shines in September in Waikapu?

The average sunshine in September in Waikapu, Hawaii, is 9.6h.

What is the month 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.

What is the UV index reading in September in Waikapu?

The average daily maximum UV index in September in Waikapu is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from the 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"

The month with the highest atmospheric pressure is April (30.05").
Months with the lowest atmospheric pressure are September and October (29.97").

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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%

Months with the highest relative humidity are July and August (76%).
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: 12.3h

The month with the longest days is June (Average daylight: 13.4h).
The month with the shortest days is December (Average daylight: 10.9h).

  • Average sunshine in September: 9.6h

The month with the most sunshine is June (Average sunshine: 11.5h).
The month with the least sunshine is December (Average sunshine: 7h).

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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

Months with the highest UV index are July, August, September and October (UV index 7).
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).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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