September weather forecastWaipio Acres, HI
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Waipio Acres, Hawaii, with temperature in the range of an average low of 74.3°F (23.5°C) and an average high of 82.4°F (28°C).Temperature
September ushers in an average high-temperature of a still warm 82.4°F (28°C), aligning closely with the preceding month. During September, Waipio Acres's temperature shows a minor deviation from daytime highs, falling to a steady low-temperature average of 74.3°F (23.5°C).Heat index
The heat index value during September is computed to be a hot 87.8°F (31°C). Continuous activity in exposure could lead to a feeling of fatigue and heat cramps.Heat index guidelines indicate values are for light wind scenarios and shaded regions. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
Humidity
With an average relative humidity of 73%, September is the least humid month.Rainfall
In Waipio Acres, in September, during 23.1 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Waipio Acres, during the entire year, the rain falls for 252.2 days and collects up to 22.09" (561mm) of precipitation.Daylight
The average length of the day in September is 12h and 16min.On the first day of the month, sunrise is at 6:15 am and sunset at 6:47 pm. On the last day of September, in Waipio Acres, Hawaii, sunrise is at 6:23 am and sunset at 6:20 pm HST.
Sunshine
In September, the average sunshine is 7.5h.UV index
March through November, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Waipio Acres, HI
- Average high temperature in September: 82.4°F
The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is February (75.6°F).
- Average low temperature in September: 74.3°F
The month with the highest average low temperature is September (74.3°F).
The coldest month (with the lowest average low temperature) is February (66.7°F).
Average pressure in September
Waipio Acres, 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
Waipio Acres, HI
- Average wind speed in September: 8.5mph
The windiest months (with the highest average wind speed) are June and July (10.2mph).
The calmest month (with the lowest average wind speed) is October (7.6mph).
Average humidity in September
Waipio Acres, HI
- Average humidity in September: 73%
The months with the highest relative humidity are February and December (77%).
The month with the lowest relative humidity is September (73%).
Average rainfall in September
Waipio Acres, HI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is October (2.6").
The driest month (with the least rainfall) is July (1.26").
Average rainfall days in September
Waipio Acres, HI
- Average rainfall days in September: 23.1 days
The month with the highest number of rainy days is August (23.8 days).
The month with the least rainy days is January (16 days).
Average daylight in September /
Average sunshine in September
Waipio Acres, HI
- Average daylight in September: 12h and 18min
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: 7h and 30min
The month with the most sunshine is June (Average sunshine: 8h and 24min).
The month with the least sunshine is November (Average sunshine: 5h and 36min).
Average sunshine days in September
Waipio Acres, HI
- Average sunshine days in September: 3.5 days
The month with the most sunshine days is January (10.8 days).
The month with the least sunshine days is August (3.3 days).
Average UV index in September
Waipio Acres, HI
- Average UV index in September: 6
The months with the highest UV index are March, April, May, June, July, August, September, October and November (UV index 6).
The months with the lowest UV index are January, February and December (UV index 5).
Average cloud cover in September
Waipio Acres, HI
- Average cloud cover in September: 47
The month with the most cloud cover is June (Cloud cover 52).
The month with the least cloud cover is January (Cloud cover 43).
Average visibility in September
Waipio Acres, 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).
