September weather forecastKihei, HI
September
Weather in September
September in Kihei marks the transition from summer to autumn, mirrored in a subtle shift in weather. Though there is a modest increase in rainfall to 0.39" (10mm), September still allows numerous opportunities for outdoor activities. Experiencing a slight drop from the summer heat, the climate remains warm, conducive to enjoying Hawaii's stunning sunsets. The steady days of sunshine enhance the captivating beauty of this month.Temperature
September stands out as Kihei's warmest month, with temperatures ranging between an average high of 79.9°F (26.6°C) and a low of 76.1°F (24.5°C).Humidity
In September, the average relative humidity is 75%.Rainfall
In Kihei, Hawaii, in September, it is raining for 8.1 days, with typically 0.39" (10mm) of accumulated precipitation. In Kihei, during the entire year, the rain falls for 103.4 days and collects up to 6.57" (167mm) of precipitation.Ocean temperature
September is the month with the warmest seawater, with an average ocean temperature of 80.1°F (26.7°C).Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 77°F (25°C) to 84.2°F (29°C), without any unpleasant sensations for prolonged durations.
Daylight
In Kihei, the average length of the day in September is 12h and 15min.On the first day of the month, sunrise is at 6:09 am and sunset at 6:41 pm. On the last day of September, sunrise is at 6:16 am and sunset at 6:14 pm HST.
Sunshine
The average sunshine in September 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 of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In September, an average UV index of 7 transforms into the following instructions:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Heed this! UV intensity is much stronger when reflected off sand and water.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kihei, 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
Kihei, 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
Kihei, 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
Kihei, 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
Kihei, 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
Kihei, 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 sea temperature in September
Kihei, HI
- Average sea temperature in September: 80°F
The best month for swimming (with the highest average sea temperature) is September (80°F).
The coldest month (with the lowest average sea temperature) is March (75.6°F).
Average daylight in September /
Average sunshine in September
Kihei, HI
- Average daylight in September: 12h and 12min
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
Kihei, 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
Kihei, 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
Kihei, 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
Kihei, 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).
