September weather forecast
Wailua, HI

Weather in September

The first month of the autumn, September, is still a warm month in Wailua, Hawaii, with average temperature varying between 75.9°F (24.4°C) and 79.7°F (26.5°C).

Temperature

The warmest month is September, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 75.9°F (24.4°C).

Humidity

In September, the average relative humidity in Wailua is 76%.

Rainfall

In Wailua, it is raining for 18.7 days, with typically 1.54" (39mm) of accumulated precipitation. In Wailua, during the entire year, the rain falls for 218.4 days and collects up to 22.13" (562mm) of precipitation.

Ocean temperature

With an average ocean temperature of 80.2°F (26.8°C), September is the month with the warmest seawater in Wailua.
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

The average length of the day in Wailua is 12.3h.

Sunshine

The average sunshine in Wailua is 8.7h.

UV index

September is the month with the highest UV index in Wailua, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 7 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Wailua?

With an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 75.9°F (24.4°C), September is the warmest month.

What is the average humidity in September in Wailua?

The average relative humidity in September in Wailua is 76%.

How many days does it rain in September in Wailua?

In Wailua, Hawaii, in September, during 18.7 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

What month is the ocean warmest in Wailua?

September is the month with the warmest seawater in Wailua, Hawaii, with an average ocean temperature of 80.2°F (26.8°C).

What is the water temperature in September in Wailua?

In September, the average ocean temperature in Wailua, Hawaii, is 80.2°F (26.8°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.

How many hours of daylight does Wailua have in September?

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

How many hours of sunshine does Wailua have in September?

The average sunshine in September is 8.7h.

What is the month with the highest UV index in Wailua?

The month with the highest UV index is September, with an average maximum UV index of 7.

How high is the UV index in September in Wailua?

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

Average temperature in September
Wailua, HI

Average temperature in September - Wailua, HI
  • Average high temperature in September: 79.7°F

The warmest month (with the highest average high temperature) is September (79.7°F).
Months with the lowest average high temperature are February and March (73.2°F).

  • Average low temperature in September: 75.9°F

The month with the highest average low temperature is September (75.9°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).

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Average pressure in September
Wailua, HI

Average pressure in September - Wailua, HI
  • Average pressure in September: 29.98"

The month with the highest atmospheric pressure is April (30.07").
Months with the lowest atmospheric pressure are September and October (29.98").

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Average wind speed in September
Wailua, HI

Average wind speed in September - Wailua, HI
  • Average wind speed in September: 11.1mph

The windiest month (with the highest average wind speed) is July (12.3mph).
The calmest month (with the lowest average wind speed) is January (10mph).

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Average humidity in September
Wailua, HI

Average humidity in September - Wailua, HI
  • Average humidity in September: 76%

Months with the highest relative humidity are June, July, August, October and December (77%).
The month with the lowest relative humidity is January (75%).

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Average rainfall in September
Wailua, HI

Average rainfall in September - Wailua, HI
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is March (2.52").
The driest month (with the least rainfall) is April (1.3").

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Average rainfall days in September
Wailua, HI

Average rainfall days in September - Wailua, HI
  • Average rainfall days in September: 18.7 days

The month with the highest number of rainy days is August (21.1 days).
The month with the least rainy days is January (12.5 days).

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Average sea temperature in September
Wailua, HI

Average sea temperature in September - Wailua, HI
  • Average sea temperature in September: 80.2°F

The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (74.8°F).

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

Average daylight in September / Average sunshine in September - Wailua, HI
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.5h).
The month with the shortest days is December (Average daylight: 10.8h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is June (Average sunshine: 9.7h).
The month with the least sunshine is November (Average sunshine: 6.2h).

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Average sunshine days in September
Wailua, HI

Average sunshine days in September - Wailua, HI
  • Average sunshine days in September: 5.3 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is August (2.9 days).

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Average UV index in September
Wailua, HI

Average UV index in September - Wailua, HI
  • Average UV index in September: 7

The month with the highest UV index is September (UV index 7).
Months with the lowest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 6).

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Average cloud cover in September
Wailua, HI

Average cloud cover in September - Wailua, HI
  • Average cloud cover in September: 38

The month with the most cloud cover is March (Cloud cover 47).
Months with the least cloud cover are January and September (Cloud cover 38).

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Average visibility in September
Wailua, HI

Average visibility in September - Wailua, 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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