September weather forecast
Poipu, HI

Weather in September

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

Temperature

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.

Humidity

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

Rainfall

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

Daylight

In Poipu, the average length of the day in September is 12h and 16min.
On the first day of September, sunrise is at 6:21 am and sunset at 6:54 pm. On the last day of the month, sunrise is at 6:28 am and sunset at 6:26 pm HST.

Sunshine

In Poipu, Hawaii, the average sunshine in September is 8.7h.

UV index

The month with the highest UV index is September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. 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.
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FAQ

What is the warmest month in Poipu?

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).

What is the temperature in September in Poipu?

The average high-temperature, in September, is 79.7°F (26.5°C), while the average low-temperature is 75.9°F (24.4°C).

What is the average humidity in September in Poipu?

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

How much does it rain in Poipu in September?

In Poipu, Hawaii, in September, it is raining for 18.7 days, with typically 1.54" (39mm) of accumulated precipitation.

How many hours of daylight does Poipu have in September?

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

What time are sunrise and sunset in September in Poipu?

In September, on the first day of the month, sunrise is at 6:21 am and sunset at 6:54 pm. On the last day of the month, in Poipu, sunrise is at 6:28 am and sunset at 6:26 pm HST.

How long on average sun shines in September in Poipu?

The average sunshine duration in September in Poipu is 8.7h.

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

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

What is the UV index reading in September in Poipu?

The average daily maximum UV index in September in Poipu, Hawaii, is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to Sun's UV rays.

Average temperature in September
Poipu, HI

Average temperature in September - Poipu, 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).

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Average pressure in September
Poipu, HI

Average pressure in September - Poipu, 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).

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Average wind speed in September
Poipu, HI

Average wind speed in September - Poipu, 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
Poipu, HI

Average humidity in September - Poipu, 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%).

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Average rainfall in September
Poipu, HI

Average rainfall in September - Poipu, 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
Poipu, HI

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

Average daylight in September / Average sunshine in September - Poipu, HI
  • Average daylight in September: 12h and 16min

The month with the longest days is June (Average daylight: 13h and 27min).
The month with the shortest days is December (Average daylight: 10h and 49min).

  • Average sunshine in September: 8h and 42min

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).

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Average sunshine days in September
Poipu, HI

Average sunshine days in September - Poipu, 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
Poipu, HI

Average UV index in September - Poipu, 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).

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Average cloud cover in September
Poipu, HI

Average cloud cover in September - Poipu, 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).

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Average visibility in September
Poipu, HI

Average visibility in September - Poipu, 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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