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
September
Weather in September
Temperature
With average high temperatures of 24.7°C (76.5°F) and lows of 23.9°C (75°F), September is the coldest month.Humidity
September through November, with an average relative humidity of 79%, are the most humid months.Rainfall
In September, in Koloa, the rain falls for 15 days. Throughout September, 44mm (1.73") of precipitation is accumulated. In Koloa, during the entire year, the rain falls for 227.2 days and collects up to 1333mm (52.48") of precipitation.Daylight
The average length of the day in September is 12h and 1min.On the first day of the month, sunrise is at 06:42 and sunset at 18:28. On the last day of September, in Koloa, sunrise is at 06:17 and sunset at 18:33 +13.
Sunshine
With an average of 6.6h of sunshine, September has the least sunshine of the year in Koloa, Tonga.UV index
The months with the lowest UV index are May through November, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 6 during September leads to these instructions:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Koloa?
What are September temperatures in Koloa?
What is the most humid month in Koloa?
What is the average humidity in September in Koloa?
How many days does it rain in September in Koloa?
How many hours of daylight does Koloa have in September?
When are sunrise and sunset in September in Koloa?
What is the month with the least sunshine in Koloa?
How many hours of sunshine does Koloa have in September?
What are the months with the lowest UV index in Koloa?
How high is the UV index in September in Koloa?
Average temperature in September
Koloa, Tonga
- Average high temperature in September: 24.7°C
The warmest month (with the highest average high temperature) is February (28.3°C).
The month with the lowest average high temperature is September (24.7°C).
- Average low temperature in September: 23.9°C
The month with the highest average low temperature is February (27.3°C).
The coldest month (with the lowest average low temperature) is July (23.7°C).
Average pressure in September
Koloa, Tonga
- Average pressure in September: 1014.8mbar
The months with the highest atmospheric pressure are August and September (1014.8mbar).
The month with the lowest atmospheric pressure is January (1007.8mbar).
Average wind speed in September
Koloa, Tonga
- Average wind speed in September: 25.7km/h
The windiest month (with the highest average wind speed) is June (27km/h).
The calmest month (with the lowest average wind speed) is March (20.2km/h).
Average humidity in September
Koloa, Tonga
- Average humidity in September: 79%
The months with the highest relative humidity are September, October and November (79%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Koloa, Tonga
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is January (275mm).
The driest month (with the least rainfall) is August (42mm).
Average rainfall days in September
Koloa, Tonga
- Average rainfall days in September: 15 days
The months with the highest number of rainy days are February and March (24.3 days).
The month with the least rainy days is August (14.6 days).
Average daylight in September /
Average sunshine in September
Koloa, Tonga
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 12min).
The month with the shortest days is June (Average daylight: 11h and 0min).
- Average sunshine in September: 6h and 4min
The month with the most sunshine is December (Average sunshine: 8h and 12min).
The month with the least sunshine is September (Average sunshine: 6h and 36min).
Average sunshine days in September
Koloa, Tonga
- Average sunshine days in September: 10.3 days
The month with the most sunshine days is August (11.8 days).
The month with the least sunshine days is February (2.3 days).
Average UV index in September
Koloa, Tonga
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April and December (UV index 7).
The months with the lowest UV index are May, June, July, August, September, October and November (UV index 6).
Average cloud cover in September
Koloa, Tonga
- Average cloud cover in September: 53
The month with the most cloud cover is October (Cloud cover 55).
The month with the least cloud cover is March (Cloud cover 46).
Average visibility in September
Koloa, Tonga
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
