September weather forecastLahaina, HI
September
Weather in September
September is renowned for boasting the highest temperatures of the year in Lahaina, averaging at a top figure of 79.7°F (26.5°C). This heat harmonizes with the prolonged daylight hours, making the month ideal for sunbathers. Simultaneously, sea temperatures also peak and stay invitingly warm. Cloud cover sees a certain decrease, ensuring clearer skies. Overall, September experiences a consolidation of the summer's warmth, before a gradual transition into the fall.Temperature
In Lahaina, September records the highest average temperatures, peaking at 79.7°F (26.5°C) and reaching a low of 76.3°F (24.6°C).Humidity
The months with the lowest humidity are January through March, September and November, with an average relative humidity of 75%.Rainfall
In September, the rain falls for 8.5 days. Throughout September, 0.43" (11mm) of precipitation is accumulated. Throughout the year, there are 112.6 rainfall days, and 7.91" (201mm) of precipitation is accumulated.Ocean temperature
The month with the warmest seawater in Lahaina, Hawaii, is September, with an average ocean temperature of 80.2°F (26.8°C).Note: For any water activity, the surface water temperatures in the range of 77°F (25°C) to 84.2°F (29°C) are deemed excellent and incredibly pleasant for longer durations.
Daylight
The average length of the day in September is 12h and 15min.On the first day of September in Lahaina, Hawaii, sunrise is at 6:10 am and sunset at 6:42 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 6:15 pm HST.
Sunshine
In September, the average sunshine in Lahaina, Hawaii, is 9.4h.UV index
July through October, with an average maximum UV index of 7, are months with the highest UV index in Lahaina. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 7 during September morphs into the following directions:
Fend off overexposure. Sun protection is vital. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Watch out! Reflections from sand and water can surge UV radiation exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Lahaina, HI
- Average high temperature in September: 79.7°F
The warmest month (with the highest average high temperature) is September (79.7°F).
The month with the lowest average high temperature is February (73.9°F).
- Average low temperature in September: 76.3°F
The months with the highest average low temperature are August and October (76.5°F).
The coldest month (with the lowest average low temperature) is March (70.7°F).
Average pressure in September
Lahaina, 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
Lahaina, HI
- Average wind speed in September: 11.8mph
The windiest month (with the highest average wind speed) is July (13.9mph).
The calmest month (with the lowest average wind speed) is January (10.6mph).
Average humidity in September
Lahaina, HI
- Average humidity in September: 75%
The month with the highest relative humidity is July (77%).
The months with the lowest relative humidity are January, February, March, September and November (75%).
Average rainfall in September
Lahaina, HI
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is March (1.1").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Lahaina, HI
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is March (13.4 days).
The month with the least rainy days is November (7.7 days).
Average sea temperature in September
Lahaina, HI
- Average sea temperature in September: 80.2°F
The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (76°F).
Average daylight in September /
Average sunshine in September
Lahaina, 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 24min
The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Lahaina, HI
- Average sunshine days in September: 18.3 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is March (12.6 days).
Average UV index in September
Lahaina, 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
Lahaina, HI
- Average cloud cover in September: 25
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is September (Cloud cover 25).
Average visibility in September
Lahaina, 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).
