September weather forecastAlofi, Niue
September
Weather in September
September in Alofi marks the advent of a warmer weather trend with minimal rainfall. Slight fluctuations in temperature hint at the return of the warmer months. The city's humidity rebounds to reach 79%, signifying a return to typical tropical weather. Subtle shifts in daylight and sunshine hours are noticeable, suggesting a change in seasons. Modest wind speeds continue to prevail, easing the transition to higher temperatures.Temperature
Alofi's transition from August to September introduces an average high-temperature of a still moderately hot 24.7°C (76.5°F), marking an insignificant variation from the 24.6°C (76.3°F). Alofi sustains a near constant temperature throughout September, with nighttime averages of 23.9°C (75°F).Humidity
January, September and November, with an average relative humidity of 79%, are the most humid months.Rainfall
In Alofi, during September, the rain falls for 17.9 days and regularly aggregates up to 52mm (2.05") of precipitation. In Alofi, during the entire year, the rain falls for 229.1 days and collects up to 1209mm (47.6") of precipitation.Sea temperature
July through October, with an average sea temperature of 25°C (77°F), are months with the coldest seawater.Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.
Daylight
In Alofi, the average length of the day in September is 12h and 0min.On the first day of the month, sunrise is at 06:26 and sunset at 18:12. On the last day of September, sunrise is at 06:01 and sunset at 18:17 -11.
Sunshine
The average sunshine in September in Alofi is 6.7h.UV index
The months with the lowest UV index are June through October, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index, 6 in September, converts into the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat. Be mindful! Sand and water reflections can up the Sun's UV exposure.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Alofi, Niue
- Average high temperature in September: 24.7°C
The warmest month (with the highest average high temperature) is March (28°C).
The month with the lowest average high temperature is August (24.6°C).
- Average low temperature in September: 23.9°C
The month with the highest average low temperature is March (27.2°C).
The coldest month (with the lowest average low temperature) is August (23.4°C).
Average pressure in September
Alofi, Niue
- Average pressure in September: 1015.2mbar
The months with the highest atmospheric pressure are August and September (1015.2mbar).
The month with the lowest atmospheric pressure is January (1008.4mbar).
Average wind speed in September
Alofi, Niue
- Average wind speed in September: 25.4km/h
The windiest month (with the highest average wind speed) is June (27.2km/h).
The calmest month (with the lowest average wind speed) is March (19.8km/h).
Average humidity in September
Alofi, Niue
- Average humidity in September: 79%
The months with the highest relative humidity are January, September and November (79%).
The months with the lowest relative humidity are March, April, June, July and August (77%).
Average rainfall in September
Alofi, Niue
- Average rainfall in September: 52mm
The wettest month (with the highest rainfall) is January (202mm).
The driest month (with the least rainfall) is June (50mm).
Average rainfall days in September
Alofi, Niue
- Average rainfall days in September: 17.9 days
The month with the highest number of rainy days is January (24.4 days).
The month with the least rainy days is November (14.8 days).
Average sea temperature in September
Alofi, Niue
- Average sea temperature in September: 25°C
The best months for swimming (with the highest average sea temperature) are January, February, March and April (28°C).
The coldest months (with the lowest average sea temperature) are July, August, September and October (25°C).
Average daylight in September /
Average sunshine in September
Alofi, Niue
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 18min).
The month with the shortest days is June (Average daylight: 11h and 0min).
- Average sunshine in September: 6h and 42min
The month with the most sunshine is December (Average sunshine: 8h and 30min).
The month with the least sunshine is June (Average sunshine: 5h and 12min).
Average sunshine days in September
Alofi, Niue
- Average sunshine days in September: 5.5 days
The month with the most sunshine days is November (13 days).
The month with the least sunshine days is February (2.9 days).
Average UV index in September
Alofi, Niue
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April, May, November and December (UV index 7).
The months with the lowest UV index are June, July, August, September and October (UV index 6).
Average cloud cover in September
Alofi, Niue
- Average cloud cover in September: 52
The months with the most cloud cover are August and November (Cloud cover 55).
The month with the least cloud cover is March (Cloud cover 47).
Average visibility in September
Alofi, Niue
- 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).
