September weather forecast and climate
Hana, HI

Weather in September

The first month of the autumn, September, is still a warm month in Hana, Hawaii, with average temperature ranging between max 79°F (26.1°C) and min 76.1°F (24.5°C).

Temperature

September is the warmest month, with an average high-temperature of 79°F (26.1°C) and an average low-temperature of 76.1°F (24.5°C).

Humidity

The average relative humidity is 77%.

Rainfall

September is the month with the least rainfall. Rain falls for 8.1 days and accumulates 0.43" (11mm) of precipitation.

Snowfall

September is the only month when snow falls in Hana. September has the most snowfall days of the year in Hana. Snow falls for 0.1 days.

Ocean temperature

The month with the warmest seawater is September, with an average ocean temperature of 79.3°F (26.3°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In September, the average length of the day is 12.2h.

Sunshine

The average sunshine in Hana, Hawaii, is 9.5h.

UV index

With an average maximum UV index of 7, September is the month with the highest UV index in Hana. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the warmest month in Hana?

The warmest month is September, with an average high-temperature of 79°F (26.1°C) and an average low-temperature of 76.1°F (24.5°C).

What is the average humidity in September in Hana?

In September, the average relative humidity is 77%.

What is the driest month in Hana?

The month with the least rainfall in Hana, Hawaii, is September when the rain falls for 8.1 days and typically collects 0.43" (11mm) of precipitation.

How many days does it rain in September in Hana?

In Hana, Hawaii, in September, during 8.1 rainfall days, 0.43" (11mm) of precipitation is typically accumulated.

What is the snowiest month in Hana?

September has the most snowfall days of the year. Snow falls for 0.1 days.

When does it start to snow in Hana?

September is the first month it typically snows in Hana, Hawaii. Throughout September, there are 0.1 snowfall days.

What is the month with the warmest ocean in Hana?

September is the month with the warmest seawater in Hana, Hawaii, with an average ocean temperature of 79.3°F (26.3°C).

How warm is the water in September in Hana?

In September, the average ocean temperature in Hana is 79.3°F (26.3°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.

What is the average length of the day in September in Hana?

In September, the average length of the day in Hana is 12.2h.

How many hours of sunshine does Hana have in September?

In September, the average sunshine is 9.5h.

When is the highest UV index in Hana?

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

What is the UV index intensity in September in Hana?

In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Hana, HI

Average temperature in September - Hana, HI
  • Average high temperature in September: 26.1°C

The warmest month (with the highest average high temperature) is September (26.1°C).
The month with the lowest average high temperature is March (22.7°C).

  • Average low temperature in September: 24.5°C

The month with the highest average low temperature is September (24.5°C).
The coldest month (with the lowest average low temperature) is March (21°C).

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Average pressure in September
Hana, HI

Average pressure in September - Hana, HI
  • Average pressure in September: 1015mbar

The month with the highest atmospheric pressure is April (1017.8mbar).
The month with the lowest atmospheric pressure is October (1014.9mbar).

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Average wind speed in September
Hana, HI

Average wind speed in September - Hana, HI
  • Average wind speed in September: 20.3km/h

The windiest month (with the highest average wind speed) is June (23.2km/h).
The calmest month (with the lowest average wind speed) is January (17.6km/h).

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Average humidity in September
Hana, HI

Average humidity in September - Hana, HI
  • Average humidity in September: 77%

Months with the highest relative humidity are July and August (78%).
Months with the lowest relative humidity are January and February (76%).

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Average rainfall in September
Hana, HI

Average rainfall in September - Hana, HI
  • Average rainfall in September: 11mm

The wettest month (with the highest rainfall) is October (55mm).
The driest month (with the least rainfall) is September (11mm).

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Average rainfall days in September
Hana, HI

Average rainfall days in September - Hana, HI
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is March (14.1 days).
The month with the least rainy days is September (8.1 days).

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Average snowfall days in September
Hana, HI

Average snowfall days in September - Hana, HI
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is September (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

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Average sea temperature in September
Hana, HI

Average sea temperature in September - Hana, HI
  • Average sea temperature in September: 26.3°C

The best month for swimming (with the highest average sea temperature) is September (26.3°C).
The coldest month (with the lowest average sea temperature) is March (24.1°C).

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

Average daylight in September / Average sunshine in September - Hana, HI
  • Average daylight in September: 12.2h

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: 9.5h

Months with the most sunshine are June and July (Average sunshine: 11.3h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Hana, HI

Average sunshine days in September - Hana, HI
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is November (11.2 days).

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Average UV index in September
Hana, HI

Average UV index in September - Hana, 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
Hana, HI

Average cloud cover in September - Hana, HI
  • Average cloud cover in September: 23

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is September (Cloud cover 23).

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Average visibility in September
Hana, HI

Average visibility in September - Hana, HI
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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