September weather forecastPuunene, HI
September
Weather in September
September bids a slow farewell to the summer in Puunene, embracing the early signs of the approaching fall. The weather continues to remain warm, while rainfall measures equal levels as the preceding months of July and August. The ever-so-slight decrease in temperature implies a gradual shift easing towards a cooler climate. Additionally, wind gusts marginally decrease, hinting at gentler winds in the forthcoming months. As October arrives, a notable drop in temperature is anticipated, along with an increase in rainfall.Temperature
Puunene reaches its highest average temperatures in September, measuring 79.5°F (26.4°C) at the peak and 75.9°F (24.4°C) at the lowest.Humidity
In Puunene, the average relative humidity in September is 76%.Rainfall
In Puunene, in September, during 7.7 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, there are 129.8 rainfall days, and 9.37" (238mm) of precipitation is accumulated.Snowfall
September is the only month when snow falls. The month with the most snowfall days is September, when snow falls for 0.1 days.Daylight
In September, the average length of the day 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
In Puunene, the average sunshine in September is 9.6h.UV index
With an average maximum UV index of 7, September is the month with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: An average UV index of 7 in September transforms into this advice:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Puunene, HI
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is September (79.5°F).
The month with the lowest average high temperature is March (73.8°F).
- Average low temperature in September: 75.9°F
The month with the highest average low temperature is September (75.9°F).
The coldest month (with the lowest average low temperature) is March (70.2°F).
Average pressure in September
Puunene, 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
Puunene, HI
- Average wind speed in September: 12.2mph
The windiest month (with the highest average wind speed) is June (14mph).
The calmest month (with the lowest average wind speed) is January (10.6mph).
Average humidity in September
Puunene, HI
- Average humidity in September: 76%
The months with the highest relative humidity are July and August (77%).
The months with the lowest relative humidity are January, February and March (75%).
Average rainfall in September
Puunene, HI
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is February (1.26").
The driest month (with the least rainfall) is June (0.28").
Average rainfall days in September
Puunene, HI
- Average rainfall days in September: 7.7 days
The month with the highest number of rainy days is March (15.6 days).
The months with the least rainy days are June, August and September (7.7 days).
Average snowfall days in September
Puunene, 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
Puunene, 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 36min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in September
Puunene, HI
- Average sunshine days in September: 16 days
The month with the most sunshine days is July (17.1 days).
The month with the least sunshine days is November (8.9 days).
Average UV index in September
Puunene, 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
Puunene, 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
Puunene, 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).
