September weather forecastVolcano, HI
September
Weather in September
As September rolls in, the weather findings for Volcano, Hawaii point towards a slight decrease in rainfall to 1.81" (46mm). The high temperatures persist from August, with the sunshine duration slightly reduced, signaling the onset of Fall. The evening breeze maintains a cool and pleasant atmosphere with consistent wind speeds. The increasing cloud cover, steady pressure, and UV index indicate a slow shift towards the milder autumn months. The stable visibility offers uninterrupted views of the vibrant fall foliage that starts to appear around Volcano.Temperature
The transition into September in Volcano shows a subtle variation to a still moderately hot 75.2°F (24°C) from August's 75.4°F (24.1°C) in the average high-temperature. In September, a low-temperature average of 70°F (21.1°C) is characteristic of Volcano, marking a minor shift from daytime temperatures.Humidity
In September, the average relative humidity is 79%.Rainfall
In September, the rain falls for 19.2 days. Throughout September, 1.81" (46mm) of precipitation is accumulated. In Volcano, during the entire year, the rain falls for 227.7 days and collects up to 27.83" (707mm) of precipitation.Daylight
In Volcano, the average length of the day in September is 12h and 14min.On the first day of September, sunrise is at 6:05 am and sunset at 6:35 pm. On the last day of the month, sunrise is at 6:11 am and sunset at 6:09 pm HST.
Sunshine
In September, the average sunshine is 8.8h.UV index
The months with the highest UV index are May through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. 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. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Volcano, HI
- Average high temperature in September: 75.2°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is March (69.6°F).
- Average low temperature in September: 70°F
The month with the highest average low temperature is September (70°F).
The coldest month (with the lowest average low temperature) is March (64°F).
Average pressure in September
Volcano, HI
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in September
Volcano, HI
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is August (7.6mph).
The calmest month (with the lowest average wind speed) is October (6.7mph).
Average humidity in September
Volcano, HI
- Average humidity in September: 79%
The month with the highest relative humidity is March (80%).
The months with the lowest relative humidity are January, May, June and July (78%).
Average rainfall in September
Volcano, HI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is February (3.78").
The driest month (with the least rainfall) is June (1.1").
Average rainfall days in September
Volcano, HI
- Average rainfall days in September: 19.2 days
The month with the highest number of rainy days is March (22.9 days).
The month with the least rainy days is January (13.3 days).
Average daylight in September /
Average sunshine in September
Volcano, HI
- Average daylight in September: 12h and 12min
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 48min
The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in September
Volcano, HI
- Average sunshine days in September: 2.5 days
The month with the most sunshine days is January (12.1 days).
The month with the least sunshine days is August (1.8 days).
Average UV index in September
Volcano, HI
- Average UV index in September: 6
The months with the highest UV index are May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March and April (UV index 5).
Average cloud cover in September
Volcano, HI
- Average cloud cover in September: 29
The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is January (Cloud cover 26).
Average visibility in September
Volcano, 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).
