September weather forecast
Nuku'alofa, Tonga

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

Nuku'alofa registers an average high-temperature of a still warm 25.3°C (77.5°F) at the commencement of September, closely related to the preceding month. During September, Nuku'alofa's temperature averages to an enjoyable 18.6°C (65.5°F) at night.

Humidity

The average relative humidity in September in Nuku'alofa is 74%.

Rainfall

In Nuku'alofa, in September, it is raining for 13 days, with typically 122mm (4.8") of accumulated precipitation. In Nuku'alofa, during the entire year, the rain falls for 180 days and collects up to 1721mm (67.76") of precipitation.

Sea temperature

The months with the coldest seawater in Nuku'alofa are August and September, with an average sea temperature of 23.8°C (74.8°F).
Note: Factor in your tolerance to cold, the sunshine, the wind, and the air's warmth, and a swim in 23.8°C (74.8°F) might be tempting. It is interesting to note that Olympians compete in 25°C (77°F) to 28°C (82.4°F) water temperatures.

Daylight

In Nuku'alofa, 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, in Nuku'alofa, sunrise is at 06:21 and sunset at 18:39 +13.

Sunshine

The average sunshine in September is 4h.

UV index

In September, the average daily maximum UV index is 10. A UV Index of 8 to 10 symbolizes a very high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: A daily high UV index of 10 in September leads to these guidelines:
Immediate damage can occur to skin and eyes if left unprotected. Always take necessary precautions. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Reduce the risk of sunburn by avoiding prolonged exposure and using sunscreen of at least 30 SPF. Caution! The Sun's UV intensity grows with reflections off sand and water.