September weather forecast
Maunaloa, HI

Weather in September

September, the first month of the autumn in Maunaloa, is also a moderately hot month, with an average temperature ranging between max 80.2°F (26.8°C) and min 77.2°F (25.1°C).

Temperature

The warmest months are August and September, with an average high-temperature of 80.2°F (26.8°C).

Humidity

The average relative humidity in September in Maunaloa is 75%.

Rainfall

In September, the rain falls for 10.1 days. Throughout September, 0.75" (19mm) of precipitation is accumulated. In Maunaloa, during the entire year, the rain falls for 126.4 days and collects up to 9.84" (250mm) of precipitation.

Ocean temperature

The months with the warmest seawater in Maunaloa are September and October, with an average ocean temperature of 80.6°F (27°C).
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

In September, the average length of the day is 12h and 15min.
On the first day of the month, sunrise is at 6:12 am and sunset at 6:44 pm. On the last day of September, sunrise is at 6:19 am and sunset at 6:17 pm HST.

Sunshine

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

UV index

June through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the 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 sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What are the warmest months in Maunaloa?

August and September, with an average high-temperature of 80.2°F (26.8°C), are warmest months in Maunaloa.

What is the average humidity in September in Maunaloa?

The average relative humidity in September in Maunaloa is 75%.

How much does it rain in Maunaloa in September?

In Maunaloa, Hawaii, in September, it is raining for 10.1 days, with typically 0.75" (19mm) of accumulated precipitation.

What are the months with the warmest ocean in Maunaloa?

September and October, with an average ocean temperature of 80.6°F (27°C), are months with the warmest seawater in Maunaloa.

What is the ocean temperature in September in Maunaloa?

In September, the average ocean temperature in Maunaloa is 80.6°F (27°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Maunaloa have in September?

In September, the average day length in Maunaloa is 12h and 15min.

When is the sunrise / sunset in September in Maunaloa?

In September, on the first day of the month, sunrise is at 6:12 am and sunset at 6:44 pm. On the last day of the month, in Maunaloa, sunrise is at 6:19 am and sunset at 6:17 pm HST.

How many hours of sunshine does Maunaloa have in September?

In Maunaloa, the average sunshine duration in September is 9.5h.

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

June through October, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index intensity in September in Maunaloa?

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

Average temperature in September
Maunaloa, HI

Average temperature in September - Maunaloa, HI
  • Average high temperature in September: 80.2°F

The warmest months (with the highest average high temperature) are August and September (80.2°F).
The month with the lowest average high temperature is February (74.3°F).

  • Average low temperature in September: 77.2°F

The months with the highest average low temperature are September and October (77.2°F).
The coldest month (with the lowest average low temperature) is March (71.2°F).

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Average pressure in September
Maunaloa, HI

Average pressure in September - Maunaloa, HI
  • Average pressure in September: 29.97"Hg

The months with the highest atmospheric pressure are March and April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

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Average wind speed in September
Maunaloa, HI

Average wind speed in September - Maunaloa, HI
  • Average wind speed in September: 11.8mph

The windiest month (with the highest average wind speed) is July (13.9mph).
The calmest month (with the lowest average wind speed) is January (10.8mph).

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Average humidity in September
Maunaloa, HI

Average humidity in September - Maunaloa, HI
  • Average humidity in September: 75%

The months with the highest relative humidity are April, May, June, July and August (76%).
The months with the lowest relative humidity are January and November (74%).

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Average rainfall in September
Maunaloa, HI

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

The wettest month (with the highest rainfall) is March (1.3").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in September
Maunaloa, HI

Average rainfall days in September - Maunaloa, HI
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is March (13.2 days).
The month with the least rainy days is July (8.5 days).

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Average sea temperature in September
Maunaloa, HI

Average sea temperature in September - Maunaloa, HI
  • Average sea temperature in September: 81°F

The best months for swimming (with the highest average sea temperature) are September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).

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

Average daylight in September / Average sunshine in September - Maunaloa, HI
  • Average daylight in September: 12h and 15min

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 52min).

  • Average sunshine in September: 9h and 30min

The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).

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Average sunshine days in September
Maunaloa, HI

Average sunshine days in September - Maunaloa, HI
  • Average sunshine days in September: 12.7 days

The month with the most sunshine days is July (16.1 days).
The month with the least sunshine days is November (10.8 days).

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Average UV index in September
Maunaloa, HI

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

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

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Average cloud cover in September
Maunaloa, HI

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

The months with the most cloud cover are February and March (Cloud cover 30).
The month with the least cloud cover is September (Cloud cover 23).

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Average visibility in September
Maunaloa, HI

Average visibility in September - Maunaloa, 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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