September weather forecastHana, HI
September
Weather in September
September in Hana signifies the culmination of the temperate escalation. This month keeps up with the consistent rise in sea temperature and concurrent drop in rainfall. Moving away from the uniform humidity of the preceding months, September marks a slide down to 77%. A minor drop in wind speed is also discernible, signaling a slowdown in the yearly wind cycle. The maximum sea temperature for the year is noted this month, tapping at 79.3°F (26.3°C).Temperature
Hana's warmest month, September, registers temperatures that range from a high of 79°F (26.1°C) to a low of 76.1°F (24.5°C).Humidity
In Hana, the average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall in Hana. Rain falls for 8.1 days and accumulates 0.43" (11mm) of precipitation.Snowfall
The only month with snowfall is September. The month with the most snowfall days in Hana is September, when snow falls for 0.1 days.Ocean temperature
The month with the warmest seawater in Hana is September, with an average ocean temperature of 79.3°F (26.3°C).Note: Water temperature ranging from 77°F (25°C) to 84.2°F (29°C) is seen as very warm and delightful by everyone. During these temperatures, water activities become enjoyable, without causing discomfort for extended periods.
Daylight
The average length of the day in September is 12h and 15min.On the first day of the month, sunrise is at 6:08 am and sunset at 6:39 pm. On the last day of September, in Hana, sunrise is at 6:14 am and sunset at 6:12 pm HST.
Sunshine
The average sunshine in September is 9.5h.UV index
September is the month with the highest UV index, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index, 7 in September, converts into the following recommendations:
Fend off overexposure. Sun protection is vital. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hana, 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
Hana, 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
Hana, 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
Hana, 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
Hana, 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
Hana, 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
Hana, 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
Hana, HI
- Average sea temperature in September: 79.3°F
The best month for swimming (with the highest average sea temperature) is September (79.3°F).
The coldest month (with the lowest average sea temperature) is March (75.5°F).
Average daylight in September /
Average sunshine in September
Hana, HI
- Average daylight in September: 12h and 12min
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 30min
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
Hana, 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
Hana, 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
Hana, 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
Hana, 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).
