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
September temperatures tend to peak at an average high of 81.7°F (27.6°C) and dip to a low of 75.7°F (24.3°C).Heat index
Throughout September, the heat index is evaluated at a hot 86°F (30°C). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', evaluates the perceived heat by adding the effect of moisture in the air. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Humidity
May and September, with an average relative humidity of 74%, are the least humid months in Waialua.Rainfall
In Waialua, in September, during 17.4 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, in Waialua, there are 190.2 rainfall days, and 11.65" (296mm) of precipitation is accumulated.Ocean temperature
The month with the warmest seawater in Waialua is September, with an average ocean temperature of 80.2°F (26.8°C).Note: For activities such as swimming and diving, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as particularly pleasant and satisfying for prolonged periods without feeling uneasy.
Daylight
In September, the average length of the day is 12h and 16min.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 Waialua, the average sunshine in September is 8.6h.UV index
July and September, with an average maximum UV index of 7, are months with the highest UV index in Waialua. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 7 suggests these recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Heed this! UV intensity is much stronger when reflected off sand and water.
Frequently asked questions
What time of the year is the hottest in Waialua?
What are September temperatures in Waialua?
What is the least humid month in Waialua?
What is the average humidity in September in Waialua?
How much does it rain in Waialua in September?
When is the ocean warmest in Waialua?
What is the ocean temperature in September in Waialua?
How many hours of daylight does Waialua have in September?
When is the sunrise / sunset in September in Waialua?
How long on average sun shines in September in Waialua?
What are the months with the highest UV index in Waialua?
How high is the UV index in September in Waialua?
Average temperature in September
Waialua, HI
- Average high temperature in September: 81.7°F
The warmest month (with the highest average high temperature) is September (81.7°F).
The month with the lowest average high temperature is February (75°F).
- Average low temperature in September: 75.7°F
The months with the highest average low temperature are August and September (75.7°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).
Average pressure in September
Waialua, HI
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The month with the lowest atmospheric pressure is October (29.97"Hg).
Average wind speed in September
Waialua, HI
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is July (11.6mph).
The calmest month (with the lowest average wind speed) is January (9mph).
Average humidity in September
Waialua, HI
- Average humidity in September: 74%
The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are May and September (74%).
Average rainfall in September
Waialua, HI
- Average rainfall in September: 0.98"
The wettest months (with the highest rainfall) are February and October (1.34").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in September
Waialua, HI
- Average rainfall days in September: 17.4 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is January (12.5 days).
Average sea temperature in September
Waialua, HI
- Average sea temperature in September: 80.2°F
The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (75.2°F).
Average daylight in September /
Average sunshine in September
Waialua, 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 48min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).
Average sunshine days in September
Waialua, HI
- Average sunshine days in September: 6.5 days
The month with the most sunshine days is January (12.9 days).
The month with the least sunshine days is September (6.5 days).
Average UV index in September
Waialua, HI
- Average UV index in September: 7
The months with the highest UV index are July and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, August, October, November and December (UV index 6).
Average cloud cover in September
Waialua, HI
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 44).
The months with the least cloud cover are January and September (Cloud cover 37).
Average visibility in September
Waialua, 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).
Waialua, Hawaii, USA
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