September weather forecastRota, Northern Mariana Islands, USA

Weather in September

September signifies the continuation of the rainy season with rainfall averages of 13.6" (345mm). The combination of shorter daylight hours and reduced sunshine hours compared to previous months points to a gradual transition towards less sunny days. Seas remain warm, bearing testament to Rota's tropical climate. With the slight decrease in daylight hours, activities may need some adjustment to fit into the shorter timescales. This period remains monsoon-like with a consistent high UV index, necessitating appropriate measures to manage sun exposure effectively.

Temperature

Rota sees its peak of temperatures during April through November, with an average high-temperature of 87.8°F (31°C).

Rainfall

In Rota, during September, the rain falls for 20 days and regularly aggregates up to 13.58" (345mm) of precipitation. Throughout the year, in Rota, there are 247 rainfall days, and 94.29" (2395mm) of precipitation is accumulated.

Ocean temperature

June through November, with an average ocean temperature of 84.2°F (29°C), are months with the warmest seawater in Rota.
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

The average length of the day in September is 12h and 13min.
On the first day of September in Rota, sunrise is at 6:07 am and sunset at 6:30 pm. On the last day of the month, sunrise is at 6:08 am and sunset at 6:09 pm ChST.

Sunshine

In September, the average sunshine is 5h.

UV index

February through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an excessive health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In September, a daily maximum UV index of 12 leads to the following instructions:
Employ every crucial safety step. Those with fair skin could experience burns in a matter of minutes. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Every two hours, apply and reapply an SPF 30+ broad-spectrum sunscreen, especially after swimming or engaging in outdoor activities. Heads up! UV intensity is amplified by reflections from water and sand.