September weather forecast and climate
Iroquois Point, HI

Weather in September

September, the first month of the autumn, in Iroquois Point, is also a moderately hot month, with average temperature ranging between max 81.5°F (27.5°C) and min 75.6°F (24.2°C).

Temperature

September is the warmest month, with an average high-temperature of 81.5°F (27.5°C) and an average low-temperature of 75.6°F (24.2°C).

Heat index

In September, the average heat index is calculated to be a hot 86.4°F (30.2°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, metabolic differences, wind), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

Months with the lowest humidity in Iroquois Point are April, May, September and November, with an average relative humidity of 74%.

Rainfall

In Iroquois Point, Hawaii,, it is raining for 17.9 days, with typically 1.22" (31mm) of accumulated precipitation. Throughout the year, there are 197.2 rainfall days, and 14.61" (371mm) of precipitation is accumulated.

Ocean temperature

With an average ocean temperature of 80.4°F (26.9°C), September is the month with the warmest seawater.
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

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

Sunshine

The average sunshine in Iroquois Point is 8.9h.

UV index

Months with the highest UV index are July through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Iroquois Point?

With an average high-temperature of 81.5°F (27.5°C) and an average low-temperature of 75.6°F (24.2°C), September is the warmest month in Iroquois Point, Hawaii.

What is the temperature in September in Iroquois Point?

In September, the average high-temperature is 81.5°F (27.5°C), and the average low-temperature is 75.6°F (24.2°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in September is calculated to be 86.4°F (30.2°C).

What are the least humid months in Iroquois Point?

April, May, September and November, with an average relative humidity of 74%, are the least humid months in Iroquois Point, Hawaii.

What is the average humidity in September in Iroquois Point?

In Iroquois Point, the average relative humidity in September is 74%.

How many days does it rain in September in Iroquois Point?

In Iroquois Point, in September, it is raining for 17.9 days, with typically 1.22" (31mm) of accumulated precipitation.

What month is the ocean warmest in Iroquois Point?

September is the month with the warmest seawater, with an average ocean temperature of 80.4°F (26.9°C).

How warm is the water in September in Iroquois Point?

In Iroquois Point, in September, the average water temperature is 80.4°F (26.9°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Iroquois Point have in September?

The average length of the day in September in Iroquois Point is 12.3h.

How many hours of sunshine does Iroquois Point have in September?

In September, the average sunshine in Iroquois Point, Hawaii, is 8.9h.

What are the months with the highest UV index in Iroquois Point?

July through September, with an average maximum UV index of 7, are months with the highest UV index in Iroquois Point.

What is the UV index intensity in September in Iroquois Point?

The average daily maximum UV index in September in Iroquois Point, Hawaii, is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Iroquois Point, HI

Average temperature in September - Iroquois Point, HI
  • Average high temperature in September: 81.5°F

The warmest month (with the highest average high temperature) is September (81.5°F).
Months with the lowest average high temperature are February and March (75°F).

  • Average low temperature in September: 75.6°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).

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Average pressure in September
Iroquois Point, HI

Average pressure in September - Iroquois Point, HI
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is April (30.06").
Months with the lowest atmospheric pressure are September and October (29.97").

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Average wind speed in September
Iroquois Point, HI

Average wind speed in September - Iroquois Point, HI
  • Average wind speed in September: 9.9mph

The windiest month (with the highest average wind speed) is July (12.1mph).
The calmest month (with the lowest average wind speed) is January (9mph).

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Average humidity in September
Iroquois Point, HI

Average humidity in September - Iroquois Point, HI
  • Average humidity in September: 74%

Months with the highest relative humidity are February and December (76%).
Months with the lowest relative humidity are April, May, September and November (74%).

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Average rainfall in September
Iroquois Point, HI

Average rainfall in September - Iroquois Point, HI
  • Average rainfall in September: 1.22"

The wettest months (with the highest rainfall) are March and October (1.81").
The driest month (with the least rainfall) is July (0.67").

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Average rainfall days in September
Iroquois Point, HI

Average rainfall days in September - Iroquois Point, HI
  • Average rainfall days in September: 17.9 days

Months with the highest number of rainy days are March and October (18 days).
The month with the least rainy days is January (12.6 days).

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Average sea temperature in September
Iroquois Point, HI

Average sea temperature in September - Iroquois Point, HI
  • Average sea temperature in September: 80.4°F

The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

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Average daylight in September /
Average sunshine in September
Iroquois Point, HI

Average daylight in September / Average sunshine in September - Iroquois Point, 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: 8.9h

The month with the most sunshine is June (Average sunshine: 10.8h).
Months with the least sunshine are November and December (Average sunshine: 6.5).

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Average sunshine days in September
Iroquois Point, HI

Average sunshine days in September - Iroquois Point, HI
  • Average sunshine days in September: 6.9 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is October (6.3 days).

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Average UV index in September
Iroquois Point, HI

Average UV index in September - Iroquois Point, HI
  • Average UV index in September: 7

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

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Average cloud cover in September
Iroquois Point, HI

Average cloud cover in September - Iroquois Point, HI
  • Average cloud cover in September: 33

The month with the most cloud cover is March (Cloud cover 40).
Months with the least cloud cover are January and September (Cloud cover 33).

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Average visibility in September
Iroquois Point, HI

Average visibility in September - Iroquois Point, 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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