September weather forecast
Kilauea, HI

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Weather in September

September, the first month of the autumn in Kilauea, is also a moderately hot month, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 75.9°F (24.4°C).

Temperature

Kilauea registers the highest average temperatures during the month of September, with peaks of 79.7°F (26.5°C) and lows of 75.9°F (24.4°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Kilauea, in September, during 18.7 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. Throughout the year, there are 218.4 rainfall days, and 22.13" (562mm) of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 16min.
On the first day of the month, sunrise is at 6:20 am and sunset at 6:53 pm. On the last day of September, sunrise is at 6:29 am and sunset at 6:25 pm HST.

Sunshine

In September, the average sunshine is 8.7h.

UV index

September is the month with the highest UV index in Kilauea, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Ward off overexposure. Defence against solar harm is crucial. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.

Frequently asked questions

What is the warmest month?

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

What is the usual temperature for Kilauea in September?

In Kilauea, 79.7°F (26.5°C) is the average high-temperature and 75.9°F (24.4°C) is the average low-temperature during September.

What is the average humidity in September?

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

How much does it rain in September?

In Kilauea, during September, the rain falls for 18.7 days and regularly aggregates up to 1.54" (39mm) of precipitation.

What is the average length of the day in September?

In September, the average day length is 12h and 16min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:20 am and sunset at 6:53 pm. On the last day of the month, sunrise is at 6:29 am and sunset at 6:25 pm HST.

How many hours of sunshine does Kilauea have in September?

In September, the average sunshine duration is 8.7h.

What is the month with the highest UV index?

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

What is the UV index intensity in September in Kilauea?

In Kilauea, Hawaii, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Kilauea, HI

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

The warmest month (with the highest average high temperature) is September (79.7°F).
The 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).

Average pressure in September
Kilauea, HI

Average pressure in September - Kilauea, HI
  • Average pressure in September: 29.98"Hg

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

Average wind speed in September
Kilauea, HI

Average wind speed in September - Kilauea, 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).

Average humidity in September
Kilauea, HI

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

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

Average rainfall in September
Kilauea, HI

Average rainfall in September - Kilauea, 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").

Average rainfall days in September
Kilauea, HI

Average rainfall days in September - Kilauea, 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).

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

Average daylight in September / Average sunshine in September - Kilauea, HI
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 30min).
The month with the shortest days is December (Average daylight: 10h and 48min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).

Average sunshine days in September
Kilauea, HI

Average sunshine days in September - Kilauea, 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).

Average UV index in September
Kilauea, HI

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

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

Average cloud cover in September
Kilauea, HI

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

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

Average visibility in September
Kilauea, HI

Average visibility in September - Kilauea, 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).

Kilauea, Hawaii, USA

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