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 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
September, on average, is the warmest month, registering a high temperature of 79°F (26.1°C) and a low of 76.1°F (24.5°C).Humidity
In Keoneoio, the average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall. Rain falls for 8.1 days and accumulates 0.43" (11mm) of precipitation.Snowfall
September is the only month when snow falls in Keoneoio. September has the most snowfall days of the year. Snow falls for 0.1 days.Daylight
In Keoneoio, 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 6:40 pm. On the last day of September, in Keoneoio, sunrise is at 6:16 am and sunset at 6:14 pm HST.
Sunshine
In Keoneoio, the average sunshine in September is 9.5h.UV index
The month with the highest UV index in Keoneoio is September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Frequently asked questions
What time of the year is the hottest in Keoneoio?
What is the temperature in September in Keoneoio?
What is the average humidity in September in Keoneoio?
What is the driest month in Keoneoio?
How much does it rain in Keoneoio in September?
When does it snow the most in Keoneoio?
When does it start to snow in Keoneoio?
How many hours of daylight does Keoneoio have in September?
When is the sunrise / sunset in September in Keoneoio?
How long on average sun shines in September in Keoneoio?
What is the month with the highest UV index in Keoneoio?
What is the UV index reading in September in Keoneoio?
Average temperature in September
Keoneoio, HI
- Average high temperature in September: 79°F
The warmest month (with the highest average high temperature) is September (79°F).
The month with the lowest average high temperature is March (72.9°F).
- Average low temperature in September: 76.1°F
The month with the highest average low temperature is September (76.1°F).
The coldest month (with the lowest average low temperature) is March (69.8°F).
Average pressure in September
Keoneoio, 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
Keoneoio, HI
- Average wind speed in September: 12.6mph
The windiest month (with the highest average wind speed) is June (14.4mph).
The calmest month (with the lowest average wind speed) is January (10.9mph).
Average humidity in September
Keoneoio, HI
- Average humidity in September: 77%
The months with the highest relative humidity are July and August (78%).
The months with the lowest relative humidity are January and February (76%).
Average rainfall in September
Keoneoio, HI
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is October (2.17").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in September
Keoneoio, HI
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is March (14.1 days).
The month with the least rainy days is September (8.1 days).
Average snowfall days in September
Keoneoio, 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 daylight in September /
Average sunshine in September
Keoneoio, HI
- Average daylight in September: 12h and 1min
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 3min
The months with the most sunshine are June and July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Keoneoio, HI
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is November (11.2 days).
Average UV index in September
Keoneoio, HI
- Average UV index in September: 7
The month with the highest UV index is September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 6).
Average cloud cover in September
Keoneoio, HI
- Average cloud cover in September: 23
The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is September (Cloud cover 23).
Average visibility in September
Keoneoio, 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).
Keoneoio, Hawaii, USA
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