Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Nānākuli sees the highest average temperatures during the months of August and September, peaking at 81.7°F (27.6°C).Heat index
The average heat index in September is evaluated at a hot 86°F (30°C). Enduring exposure and continuous activity might cause a feeling of tiredness and induce heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Humidity
January, April through June, August through November, with an average relative humidity of 74%, are the least humid months in Nānākuli.Rainfall
In September, in Nānākuli, the rain falls for 18.9 days. Throughout September, 1.26" (32mm) of precipitation is accumulated. Throughout the year, in Nānākuli, there are 196.3 rainfall days, and 14.72" (374mm) of precipitation is accumulated.Ocean temperature
With an average ocean temperature of 80.6°F (27°C), September is the month with the warmest seawater in Nānākuli, Hawaii.Note: For activities in the water such as swimming or diving, temperatures from 77°F (25°C) to 84.2°F (29°C) are considered optimal for prolonged enjoyment without discomfort.
Daylight
The average length of the day in September is 12h and 15min.On the first day of September, sunrise is at 6:16 am and sunset at 6:48 pm. On the last day of the month, sunrise is at 6:23 am and sunset at 6:20 pm HST.
Sunshine
In September, the average sunshine in Nānākuli is 9.1h.UV index
June through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 7 transforms into these recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Notice! Sand and water reflections contribute to a stronger UV exposure.
Frequently asked questions
What is the warmest month in Nānākuli?
What are the temperatures in Nānākuli in September?
What are the least humid months in Nānākuli?
What is the average humidity in September in Nānākuli?
How many days does it rain in September in Nānākuli?
What is the month with the warmest ocean in Nānākuli?
What is the water temperature in September in Nānākuli?
How many hours of daylight does Nānākuli have in September?
When is the sunrise / sunset in September in Nānākuli?
How many hours of sunshine does Nānākuli have in September?
When is the highest UV index in Nānākuli?
What is the UV index reading in September in Nānākuli?
Average temperature in September
Nānākuli, HI
- Average high temperature in September: 81.7°F
The warmest months (with the highest average high temperature) are August and September (81.7°F).
The month with the lowest average high temperature is February (75°F).
- Average low temperature in September: 75.9°F
The months with the highest average low temperature are August and September (75.9°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).
Average pressure in September
Nānākuli, HI
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in September
Nānākuli, HI
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is July (11.6mph).
The calmest month (with the lowest average wind speed) is October (8.8mph).
Average humidity in September
Nānākuli, HI
- Average humidity in September: 74%
The month with the highest relative humidity is December (76%).
The months with the lowest relative humidity are January, April, May, June, August, September, October and November (74%).
Average rainfall in September
Nānākuli, HI
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is March (1.81").
The driest month (with the least rainfall) is July (0.67").
Average rainfall days in September
Nānākuli, HI
- Average rainfall days in September: 18.9 days
The month with the highest number of rainy days is September (18.9 days).
The month with the least rainy days is January (13.8 days).
Average sea temperature in September
Nānākuli, HI
- Average sea temperature in September: 80.6°F
The best month for swimming (with the highest average sea temperature) is September (80.6°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight in September /
Average sunshine in September
Nānākuli, HI
- Average daylight in September: 12h and 2min
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 54min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is November (Average sunshine: 6h and 36min).
Average sunshine days in September
Nānākuli, HI
- Average sunshine days in September: 6.6 days
The month with the most sunshine days is January (11.8 days).
The month with the least sunshine days is November (6.4 days).
Average UV index in September
Nānākuli, HI
- Average UV index in September: 7
The months with the highest UV index are June, July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, October, November and December (UV index 6).
Average cloud cover in September
Nānākuli, HI
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 38).
The months with the least cloud cover are January and September (Cloud cover 32).
Average visibility in September
Nānākuli, 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).
Nānākuli, Hawaii, USA
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