September weather forecastNuku'alofa, Tonga
September
Weather in September
September in Nuku'alofa witnesses the commencement of a mild climb in temperatures. The effect of this slow ascend is visible with a high of 25.3°C (77.5°F). It records a minor surge in rainfall compared to August, indicating the progressive shift towards the wetter seasons. The daylight duration extends noticeably, shedding more light on the island's beauty. The sea temperature mimics the air's warming trend, appealing to those wanting to paddle amid the turquoise waves.Temperature
September registers an average high-temperature of a still warm 25.3°C (77.5°F), slightly varied from August's 24.8°C (76.6°F). During September, Nuku'alofa experiences a consistent low-temperature average of 18.6°C (65.5°F).Humidity
In September, the average relative humidity is 74%.Rainfall
In Nuku'alofa, during September, the rain falls for 13 days and regularly aggregates up to 122mm (4.8") of precipitation. Throughout the year, there are 180 rainfall days, and 1721mm (67.76") of precipitation is accumulated.Sea temperature
The months with the coldest seawater are August and September, with an average sea temperature of 23.8°C (74.8°F).Note: If someone is sensitive to cold, the enjoyment of swimming in 23.8°C (74.8°F) water hinges on factors like sunshine, wind, and the current air temperature. (For context: Olympic swimming competitions are held in water temperatures of 25°C (77°F) to 28°C (82.4°F).)
Daylight
The average length of the day in September is 11h and 59min.On the first day of the month, sunrise is at 06:49 and sunset at 18:32. On the last day of September, sunrise is at 06:21 and sunset at 18:39 +13.
Sunshine
In Nuku'alofa, the average sunshine in September is 4h.UV index
The average daily maximum UV index in September is 10. A UV Index of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In September, a regular UV index of 10 translates into these guidelines:
Always stay safe. Unprotected skin and eyes can get damaged rapidly. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Combat sunburn and harmful sun radiation by consistently applying sunscreen with at least 30 SPF. Notice! The reflection of water and sand increases the UV radiation significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nuku'alofa, Tonga
- Average high temperature in September: 25.3°C
The warmest month (with the highest average high temperature) is February (29.9°C).
The month with the lowest average high temperature is August (24.8°C).
- Average low temperature in September: 18.6°C
The month with the highest average low temperature is February (23.7°C).
The coldest month (with the lowest average low temperature) is July (18.1°C).
Average humidity in September
Nuku'alofa, Tonga
- Average humidity in September: 74%
The month with the highest relative humidity is March (79%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
Nuku'alofa, Tonga
- Average rainfall in September: 122mm
The wettest month (with the highest rainfall) is February (210mm).
The driest months (with the least rainfall) are June and July (95mm).
Average rainfall days in September
Nuku'alofa, Tonga
- Average rainfall days in September: 13 days
The months with the highest number of rainy days are February and March (19 days).
The month with the least rainy days is October (11 days).
Average sea temperature in September
Nuku'alofa, Tonga
- Average sea temperature in September: 23.8°C
The best month for swimming (with the highest average sea temperature) is March (28.1°C).
The coldest months (with the lowest average sea temperature) are August and September (23.8°C).
Average daylight in September /
Average sunshine in September
Nuku'alofa, Tonga
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 24min).
The month with the shortest days is June (Average daylight: 10h and 54min).
- Average sunshine in September: 4h
The months with the most sunshine are January and March (Average sunshine: 18h).
The month with the least sunshine is August (Average sunshine: 3h).
Average UV index in September
Nuku'alofa, Tonga
- Average UV index in September: 10
The months with the highest UV index are January, February, March, November and December (UV index 12).
The months with the lowest UV index are June and July (UV index 6).
