Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In Lanai City, Hawaii, the peak temperatures are generally noted in September, averaging a high of 81°F (27.2°C) and a low of 77.4°F (25.2°C).Heat index
Throughout September, the heat index is estimated at a tropical 86°F (30°C). With ongoing exposure and activity, one might experience weariness, and heat cramps could ensue.Heat index data is primarily for areas with shade and subjected to light winds. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', is a composite of temperature and humidity figures to convey how warm it feels. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Humidity
In Lanai City, the average relative humidity in September is 74%.Rainfall
In Lanai City, Hawaii, in September, during 7.1 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Lanai City, during the entire year, the rain falls for 98.9 days and collects up to 7.64" (194mm) of precipitation.Snowfall
The only month with snowfall in Lanai City is September. September has the most snowfall days of the year in Lanai City. Snow falls for 0.1 days.Ocean temperature
September and October, with an average ocean temperature of 80.6°F (27°C), are months with the warmest seawater.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 September, the average length of the day is 12h and 15min.On the first day of the month, sunrise is at 6:11 am and sunset at 6:43 pm. On the last day of September, sunrise is at 6:18 am and sunset at 6:16 pm HST.
Sunshine
In September, the average sunshine is 9.8h.UV index
May through October, with an average maximum UV index of 7, are months with the highest UV index in Lanai City. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the ordinary person.Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the hottest time of year in Lanai City?
What are the temperatures in Lanai City in September?
What is the average humidity in September in Lanai City?
How much does it rain in Lanai City in September?
When does it snow the most in Lanai City?
When does it start to snow in Lanai City?
What are the months with the warmest ocean in Lanai City?
What is the water temperature in September in Lanai City?
What is the average length of the day in September in Lanai City?
When is the sunrise / sunset in September in Lanai City?
How many hours of sunshine does Lanai City have in September?
What are the months with the highest UV index in Lanai City?
What is the UV index reading in September in Lanai City?
Average temperature in September
Lanai City, HI
- Average high temperature in September: 81°F
The warmest month (with the highest average high temperature) is September (81°F).
The month with the lowest average high temperature is February (74.8°F).
- Average low temperature in September: 77.4°F
The months with the highest average low temperature are August and October (77.5°F).
The coldest month (with the lowest average low temperature) is March (71.6°F).
Average pressure in September
Lanai City, HI
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is April (30.05"Hg).
The month with the lowest atmospheric pressure is October (29.96"Hg).
Average wind speed in September
Lanai City, HI
- Average wind speed in September: 9.7mph
The windiest months (with the highest average wind speed) are March and November (10.9mph).
The calmest month (with the lowest average wind speed) is October (9mph).
Average humidity in September
Lanai City, HI
- Average humidity in September: 74%
The month with the highest relative humidity is July (75%).
The months with the lowest relative humidity are January and November (73%).
Average rainfall in September
Lanai City, HI
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is March (1.26").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Lanai City, HI
- Average rainfall days in September: 7.1 days
The month with the highest number of rainy days is March (12.7 days).
The month with the least rainy days is July (4.7 days).
Average snowfall days in September
Lanai City, HI
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).
Average sea temperature in September
Lanai City, HI
- Average sea temperature in September: 81°F
The best months for swimming (with the highest average sea temperature) are September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).
Average daylight in September /
Average sunshine in September
Lanai City, HI
- Average daylight in September: 12h and 2min
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 5min
The month with the most sunshine is June (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).
Average sunshine days in September
Lanai City, HI
- Average sunshine days in September: 21.5 days
The month with the most sunshine days is July (25.6 days).
The month with the least sunshine days is February (12.7 days).
Average UV index in September
Lanai City, HI
- Average UV index in September: 7
The months with the highest UV index are May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, November and December (UV index 6).
Average cloud cover in September
Lanai City, HI
- Average cloud cover in September: 18
The month with the most cloud cover is March (Cloud cover 27).
The month with the least cloud cover is September (Cloud cover 18).
Average visibility in September
Lanai City, 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).
Lanai City, Hawaii, USA
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