September weather forecast
Kalaoa, HI

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Weather in September

September marks the descent from the highs of summer. While it keeps up with August's heat, it brings in slightly more rain, hinting at the transition to autumn. Though October sees a further dip in temperature, it follows September's lead in terms of rainfall. The weather in Kalaoa at this time of the year still resembles the summer months but with signs of the upcoming cooler autumn. It's a blend of seasonal changes that allows a unique mix of warm days and slightly cooler nights.

Temperature

During September, Kalaoa records an average high-temperature of a still moderately hot 78.3°F (25.7°C), marking a slight divergence from August's 78.4°F (25.8°C). Kalaoa's temperature during September nights registers a minor decrease to an average low of 74.8°F (23.8°C).

Humidity

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

Rainfall

In Kalaoa, in September, it is raining for 13.4 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 136 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of September in Kalaoa, sunrise is at 6:08 am and sunset at 6:38 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:12 pm HST.

Sunshine

In Kalaoa, the average sunshine in September is 9.5h.

UV index

January through December, with an average maximum UV index of 6, are months with the highest UV index in Kalaoa. January through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: In September, the UV index of 6 transforms into the following advice:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
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Frequently asked questions

What are the temperatures in Kalaoa in September?

Kalaoa in September has an average high-temperature of 78.3°F (25.7°C) and an average low-temperature of 74.8°F (23.8°C).

What is the average humidity in September in Kalaoa?

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

How many days does it rain in September in Kalaoa?

In Kalaoa, Hawaii, in September, it is raining for 13.4 days, with typically 0.75" (19mm) of accumulated precipitation.

How many hours of daylight does Kalaoa have in September?

In September, the average day length is 12h and 14min.

What time are sunrise and sunset in September in Kalaoa?

In September, on the first day of the month, sunrise is at 6:08 am and sunset at 6:38 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:12 pm HST.

How many hours of sunshine does Kalaoa have in September?

The average sunshine duration in September in Kalaoa, Hawaii, is 9.5h.

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

January through December, with an average maximum UV index of 6, are months with the highest UV index in Kalaoa, Hawaii.

When is the lowest UV index in Kalaoa?

The months with the lowest UV index are January through December, with an average maximum UV index of 6.

What is the UV index intensity in September in Kalaoa?

The average daily maximum UV index in September in Kalaoa, Hawaii, is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Kalaoa, HI

Average temperature in September - Kalaoa, HI
  • Average high temperature in September: 78.3°F

The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is February (73.2°F).

  • Average low temperature in September: 74.8°F

The months with the highest average low temperature are August, September and October (74.8°F).
The coldest month (with the lowest average low temperature) is March (69.4°F).

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Average pressure in September
Kalaoa, HI

Average pressure in September - Kalaoa, HI
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is April (30.04"Hg).
The months with the lowest atmospheric pressure are September and October (29.96"Hg).

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Average wind speed in September
Kalaoa, HI

Average wind speed in September - Kalaoa, HI
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is February (6.2mph).
The calmest month (with the lowest average wind speed) is July (5mph).

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Average humidity in September
Kalaoa, HI

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

The months with the highest relative humidity are June, July and August (77%).
The month with the lowest relative humidity is February (71%).

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Average rainfall in September
Kalaoa, HI

Average rainfall in September - Kalaoa, HI
  • Average rainfall in September: 0.75"

The wettest month (with the highest rainfall) is February (0.98").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in September
Kalaoa, HI

Average rainfall days in September - Kalaoa, HI
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is February (8.1 days).

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

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

The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 7h and 24min).

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Average sunshine days in September
Kalaoa, HI

Average sunshine days in September - Kalaoa, HI
  • Average sunshine days in September: 8.3 days

The month with the most sunshine days is January (14.5 days).
The month with the least sunshine days is October (6.8 days).

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Average UV index in September
Kalaoa, HI

Average UV index in September - Kalaoa, HI
  • Average UV index in September: 6

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

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Average cloud cover in September
Kalaoa, HI

Average cloud cover in September - Kalaoa, HI
  • Average cloud cover in September: 18

The months with the most cloud cover are April, May and June (Cloud cover 21).
The month with the least cloud cover is January (Cloud cover 12).

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Average visibility in September
Kalaoa, HI

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

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