September weather forecastKaaawa, HI
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Kaaawa, Hawaii, with temperature in the range of an average high of 81°F (27.2°C) and an average low of 76.3°F (24.6°C).Temperature
August and September bring Kaaawa's highest average temperatures, reaching a high of 81°F (27.2°C).Heat index
The heat index for September is estimated at a hot 86°F (30°C). With extended exposure and activity, one might feel exhausted and experience heat cramps.Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. 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 vital to babies and toddlers. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
Humidity
January, May, June, September and November, with an average relative humidity of 75%, are the least humid months.Rainfall
In Kaaawa, in September, it is raining for 14.5 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, in Kaaawa, Hawaii, there are 187.1 rainfall days, and 15.83" (402mm) of precipitation is accumulated.Ocean temperature
September is the month with the warmest seawater, with an average ocean temperature of 80.1°F (26.7°C).Note: For engaging in any water activities, temperatures from 77°F (25°C) to 84.2°F (29°C) are viewed as outstanding and exceptionally pleasing for prolonged durations.
Daylight
In Kaaawa, the average length of the day in September is 12h and 16min.On the first day of September in Kaaawa, sunrise is at 6:14 am and sunset at 6:47 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 6:19 pm HST.
Sunshine
In September, the average sunshine is 9h.UV index
The months with the highest UV index are July through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 7 in September translates into these instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Warning! Sand and water reflections boost the intensity of UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kaaawa, HI
- Average high temperature in September: 81°F
The warmest months (with the highest average high temperature) are August and September (81°F).
The month with the lowest average high temperature is February (74.3°F).
- Average low temperature in September: 76.3°F
The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is February (69.6°F).
Average pressure in September
Kaaawa, 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
Kaaawa, HI
- Average wind speed in September: 11.4mph
The windiest month (with the highest average wind speed) is July (13.5mph).
The calmest month (with the lowest average wind speed) is January (10.3mph).
Average humidity in September
Kaaawa, HI
- Average humidity in September: 75%
The months with the highest relative humidity are February, March, April, July, August, October and December (76%).
The months with the lowest relative humidity are January, May, June, September and November (75%).
Average rainfall in September
Kaaawa, HI
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.71").
Average rainfall days in September
Kaaawa, HI
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is March (18.3 days).
The month with the least rainy days is June (13.5 days).
Average sea temperature in September
Kaaawa, HI
- Average sea temperature in September: 80.1°F
The best month for swimming (with the highest average sea temperature) is September (80.1°F).
The coldest month (with the lowest average sea temperature) is March (75°F).
Average daylight in September /
Average sunshine in September
Kaaawa, 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 48min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in September
Kaaawa, HI
- Average sunshine days in September: 11.2 days
The month with the most sunshine days is June (12.2 days).
The month with the least sunshine days is April (6.5 days).
Average UV index in September
Kaaawa, HI
- Average UV index in September: 7
The months with the highest UV index are July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, October, November and December (UV index 6).
Average cloud cover in September
Kaaawa, HI
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in September
Kaaawa, 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).
