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 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 September, Naalehu experiences a minor shift in meteorological conditions with average high-temperatures marked at a still agreeable 73°F (22.8°C), closely mirroring the climate in August. Naalehu maintains an average low-temperature of 69.8°F (21°C) throughout September's nights.Humidity
The months with the highest humidity in Naalehu are June through September, with an average relative humidity of 81%.Rainfall
The month with the most rainfall is September, when the rain falls for 21.5 days and typically aggregates up to 1.81" (46mm) of precipitation.Daylight
In September, the average length of the day is 12h and 14min.On the first day of September, sunrise is at 6:07 am and sunset at 6:36 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 6:11 pm HST.
Sunshine
The average sunshine in September in Naalehu is 8.7h.UV index
May through October, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What is the average September temperature in Naalehu?
What is the most humid month in Naalehu?
What is the average humidity in September in Naalehu?
What is the rainiest month in Naalehu?
How much does it rain in Naalehu in September?
How many hours of daylight does Naalehu have in September?
When is the sunrise / sunset in September in Naalehu?
How long on average sun shines in September in Naalehu?
When is the highest UV index in Naalehu?
How high is the UV index in September in Naalehu?
Average temperature in September
Naalehu, HI
- Average high temperature in September: 73°F
The warmest months (with the highest average high temperature) are August and October (73.2°F).
The month with the lowest average high temperature is February (68.9°F).
- Average low temperature in September: 69.8°F
The month with the highest average low temperature is October (70°F).
The coldest month (with the lowest average low temperature) is March (64.8°F).
Average pressure in September
Naalehu, HI
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is April (30.04"Hg).
The months with the lowest atmospheric pressure are September and October (29.96"Hg).
Average wind speed in September
Naalehu, HI
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is December (5.3mph).
Average humidity in September
Naalehu, HI
- Average humidity in September: 81%
The months with the highest relative humidity are June, July, August and September (81%).
The month with the lowest relative humidity is February (73%).
Average rainfall in September
Naalehu, HI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is September (1.81").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in September
Naalehu, HI
- Average rainfall days in September: 21.5 days
The month with the highest number of rainy days is August (21.8 days).
The month with the least rainy days is January (10.8 days).
Average daylight in September /
Average sunshine in September
Naalehu, HI
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is May (Average sunshine: 10h and 42min).
The months with the least sunshine are November and December (Average sunshine: 7h and 18min).
Average sunshine days in September
Naalehu, HI
- Average sunshine days in September: 3.5 days
The month with the most sunshine days is January (12.7 days).
The month with the least sunshine days is May (3.2 days).
Average UV index in September
Naalehu, HI
- Average UV index in September: 6
The months with the highest UV index are May, June, July, August, September and October (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 5).
Average cloud cover in September
Naalehu, HI
- Average cloud cover in September: 28
The month with the most cloud cover is June (Cloud cover 31).
The month with the least cloud cover is January (Cloud cover 15).
Average visibility in September
Naalehu, 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).
Naalehu, Hawaii, USA
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