September weather forecastKawaihae, HI
September
Weather in September
September reminisces the summer warmth with temperatures from 59°F (15°C) to 66.4°F (19.1°C) in Kawaihae. A significant hike in rainfall to 3.31" (84mm) does herald the advent of fall. With humidity peaking at 84%, showers render the weather pleasantly muggy. Visitors may relish the sea temperatures lingering around 79.6°F (26.4°C), providing continued opportunities to explore the Hawaiian waters. Despite the increased rainfall, the weather largely remains pleasant making September a sought-after time for visiting.Temperature
September's average high-temperature stands at a still enjoyable 66.4°F (19.1°C), showing little deviation from August's 67.5°F (19.7°C). September nights document an average temperature reading of 59°F (15°C).Humidity
September and October, with an average relative humidity of 84%, are the most humid months in Kawaihae.Rainfall
In Kawaihae, in September, it is raining for 27.3 days, with typically 3.31" (84mm) of accumulated precipitation. In Kawaihae, during the entire year, the rain falls for 280.8 days and collects up to 33.9" (861mm) of precipitation.Ocean temperature
September is the month with the warmest seawater in Kawaihae, with an average ocean temperature of 79.5°F (26.4°C).Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.
Daylight
In Kawaihae, the average length of the day in September is 12h and 14min.On the first day of September in Kawaihae, sunrise is at 6:07 am and sunset at 6:38 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:11 pm HST.
Sunshine
The average sunshine in September in Kawaihae is 7.7h.UV index
The months with the highest UV index are May through October, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: In September, a daily UV index of 5 turns into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Notice! Sand and water reflections contribute to a stronger UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kawaihae, HI
- Average high temperature in September: 66.4°F
The warmest month (with the highest average high temperature) is August (67.5°F).
The month with the lowest average high temperature is March (61.9°F).
- Average low temperature in September: 59°F
The month with the highest average low temperature is September (59°F).
The coldest month (with the lowest average low temperature) is February (52°F).
Average pressure in September
Kawaihae, 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
Kawaihae, HI
- Average wind speed in September: 4.6mph
The windiest months (with the highest average wind speed) are July and August (5.5mph).
The calmest months (with the lowest average wind speed) are January, May and October (4.5mph).
Average humidity in September
Kawaihae, HI
- Average humidity in September: 84%
The months with the highest relative humidity are September and October (84%).
The month with the lowest relative humidity is February (78%).
Average rainfall in September
Kawaihae, HI
- Average rainfall in September: 3.31"
The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is June (1.57").
Average rainfall days in September
Kawaihae, HI
- Average rainfall days in September: 27.3 days
The month with the highest number of rainy days is September (27.3 days).
The month with the least rainy days is January (17.1 days).
Average sea temperature in September
Kawaihae, HI
- Average sea temperature in September: 79.6°F
The best month for swimming (with the highest average sea temperature) is September (79.6°F).
The coldest month (with the lowest average sea temperature) is March (75.8°F).
Average daylight in September /
Average sunshine in September
Kawaihae, HI
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in September: 7h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in September
Kawaihae, HI
- Average sunshine days in September: 0.8 days
The month with the most sunshine days is January (9.7 days).
The month with the least sunshine days is September (0.8 days).
Average UV index in September
Kawaihae, HI
- Average UV index in September: 5
The months with the highest UV index are May, June, July, August, September and October (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 4).
Average cloud cover in September
Kawaihae, HI
- Average cloud cover in September: 43
The months with the most cloud cover are April and September (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 29).
Average visibility in September
Kawaihae, 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).
