September weather forecast
Rennell Island, Solomon Islands

September weather on Rennell Island presents a mixed bag of conditions. Matching August rainfall, with 176mm (6.93"), the weather remains pleasantly humid and warm. Stable sea temperatures continue to facilitate water-based recreational activities. The increase in daylight hours aligns with increasing activity on the island. As the UV index levels maximize, it's more important than ever to remember sunscreen.

Temperature

The transition from August to September in Rennell Island sees average high-temperatures adjusting to a still tropical 30°C (86°F), identical to the previous month. The average temperature during September nights dips to a pleasant 22°C (71.6°F).

Rainfall

In Rennell Island, in September, during 14 rainfall days, 176mm (6.93") of precipitation is typically accumulated. Throughout the year, there are 196 rainfall days, and 2764mm (108.82") of precipitation is accumulated.

Sea temperature

June through October, with an average sea temperature of 28°C (82.4°F), are months with the coldest seawater.
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are considered superb and highly pleasant for water activities over extended periods.

Daylight

The average length of the day in September is 12h and 2min.
On the first day of the month, sunrise is at 06:22 and sunset at 18:16. On the last day of September, sunrise is at 06:03 and sunset at 18:15 +11.

Sunshine

The months with the least sunshine are January through July, September and December, with an average of 6h of sunshine.

UV index

January through April, September through December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The daily high UV index of 12 in September translates into this advice:
Take all critical precautions, unprotected skin might burn swiftly. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Apply generously and frequently a broad-spectrum SPF 30+ sunscreen every two hours, or immediately after swimming or any outdoor exercise. Attention! UV radiation is markedly stronger with water and sand reflections.