September weather forecastMākaha, HI
September
Weather in September
In Mākaha, Hawaii, September brings the beginning of the fall season and a welcome reduction of the high summer temperatures. With the sea temperature peaking to 80.6°F (27°C), the Pacific waters are at their warmest. Despite the onset of fall, the long daylight hours continue to permit outdoor adventures. The fall equinox in September brings nearly equal hours of day and night, suggesting an appealing weather balance. Furthermore, reduced humidity signals the arrival of the pleasant autumn season.Temperature
The temperatures in Mākaha reach their highest averages in September, with highs of 81.7°F (27.6°C) and lows of 75.7°F (24.3°C).Heat index
September's heat index is calculated to be a hot 86°F (30°C). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Humidity
May and September, with an average relative humidity of 74%, are the least humid months in Mākaha.Rainfall
In September, in Mākaha, the rain falls for 17.4 days. Throughout September, 0.98" (25mm) of precipitation is accumulated. In Mākaha, Hawaii, during the entire year, the rain falls for 190.2 days and collects up to 11.65" (296mm) of precipitation.Ocean temperature
With an average ocean temperature of 80.6°F (27°C), September is the month with the warmest seawater.Note: Engaging in water activities, such as swimming or diving, in temperatures from 77°F (25°C) to 84.2°F (29°C) is very pleasurable for extended periods, without any discomfort.
Daylight
The average length of the day in September is 12h and 16min.On the first day of September in Mākaha, sunrise is at 6:16 am and sunset at 6:48 pm. On the last day of the month, sunrise is at 6:24 am and sunset at 6:21 pm HST.
Sunshine
In Mākaha, Hawaii, the average sunshine in September is 8.6h.UV index
The months with the highest UV index are July and September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, the UV index of 7 transforms into the following advice:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mākaha, 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
Mākaha, 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
Mākaha, 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
Mākaha, 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
Mākaha, 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
Mākaha, 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
Mākaha, HI
- Average sea temperature in September: 80.6°F
The best month for swimming (with the highest average sea temperature) is September (80.6°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight in September /
Average sunshine in September
Mākaha, 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: 8h and 36min
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
Mākaha, 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
Mākaha, 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
Mākaha, 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
Mākaha, 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).
