September weather forecastWaikapu, HI
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Waikapu, Hawaii, with an average temperature fluctuating between 76.1°F (24.5°C) and 79.9°F (26.6°C).Temperature
Waikapu's warmest month, September, registers temperatures that range from a high of 79.9°F (26.6°C) to a low of 76.1°F (24.5°C).Humidity
In Waikapu, the average relative humidity in September is 75%.Rainfall
In Waikapu, during September, the rain falls for 8.1 days and regularly aggregates up to 0.39" (10mm) of precipitation. In Waikapu, during the entire year, the rain falls for 103.4 days and collects up to 6.57" (167mm) of precipitation.Daylight
The average length of the day in September is 12h and 15min.On the first day of the month, sunrise is at 6:10 am and sunset at 6:41 pm. On the last day of September, sunrise is at 6:17 am and sunset at 6:14 pm HST.
Sunshine
In September, the average sunshine is 9.6h.UV index
The months with the highest UV index are July through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, a daily UV index of 7 turns into the following recommendations:
Shield from overexposure. Defense against sun-related harm is required. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Waikapu, HI
- Average high temperature in September: 79.9°F
The warmest month (with the highest average high temperature) is September (79.9°F).
The month with the lowest average high temperature is February (73.9°F).
- Average low temperature in September: 76.1°F
The month with the highest average low temperature is October (76.5°F).
The coldest months (with the lowest average low temperature) are February and March (70.7°F).
Average pressure in September
Waikapu, HI
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in September
Waikapu, HI
- Average wind speed in September: 11.9mph
The windiest month (with the highest average wind speed) is June (13.6mph).
The calmest month (with the lowest average wind speed) is January (10.4mph).
Average humidity in September
Waikapu, HI
- Average humidity in September: 75%
The months with the highest relative humidity are July and August (76%).
The months with the lowest relative humidity are January and February (74%).
Average rainfall in September
Waikapu, HI
- Average rainfall in September: 0.39"
The wettest months (with the highest rainfall) are March and December (0.87").
The driest month (with the least rainfall) is June (0.2").
Average rainfall days in September
Waikapu, HI
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is June (6.6 days).
Average daylight in September /
Average sunshine in September
Waikapu, 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: 9h and 36min
The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in September
Waikapu, HI
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is June (19.9 days).
The month with the least sunshine days is March (15.2 days).
Average UV index in September
Waikapu, HI
- Average UV index in September: 7
The months with the highest UV index are July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, November and December (UV index 6).
Average cloud cover in September
Waikapu, HI
- Average cloud cover in September: 21
The month with the most cloud cover is March (Cloud cover 30).
The months with the least cloud cover are June and September (Cloud cover 21).
Average visibility in September
Waikapu, 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).
