September weather forecast
Rota, Northern Mariana Islands, USA

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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.

Frequently asked questions

What time of the year is the hottest in Rota?

Rota's warmest period falls in April through November, when the average high-temperatures ascend to 87.8°F (31°C).

How hot is it in Rota in September?

Rota in September has an average high-temperature of 87.8°F (31°C) and an average low-temperature of 77°F (25°C).

How much does it rain in Rota in September?

In Rota, Northern Mariana Islands, during September, the rain falls for 20 days and regularly aggregates up to 13.58" (345mm) of precipitation.

What are the months with the warmest ocean in Rota?

The months with the warmest seawater in Rota are June through November, with an average ocean temperature of 84.2°F (29°C).

How warm is the water in September in Rota?

In September, the average ocean temperature is 84.2°F (29°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Rota have in September?

The average day length in September is 12h and 13min.

When are sunrise and sunset in September in Rota?

In September, on the first day of the month, 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.

How long on average sun shines in September in Rota?

The average sunshine duration in September is 5h.

When is the highest UV index in Rota?

February through September, with an average maximum UV index of 12, are months with the highest UV index in Rota, Northern Mariana Islands.

How high is the UV index in September in Rota?

The average daily maximum UV index in September in Rota, Northern Mariana Islands, is 12. A UV Index of 11, and more, symbolizes an excessive health risk from unprotected exposure to UV radiation.
Average low temperature
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Rota, Northern Mariana Islands, USA

Average temperature in September - Rota, Northern Mariana Islands, USA
  • Average high temperature in September: 88°F

The warmest months (with the highest average high temperature) are April, May, June, July, August, September, October and November (88°F).
The month with the lowest average high temperature is January (84°F).

  • Average low temperature in September: 77°F

The months with the highest average low temperature are May, June, July, August, September, October and November (77°F).
The coldest months (with the lowest average low temperature) are January, February, March, April and December (75°F).

Average rainfall in September
Rota, Northern Mariana Islands, USA

Average rainfall in September - Rota, Northern Mariana Islands, USA
  • Average rainfall in September: 13.6"

The wettest month (with the highest rainfall) is August (14.4").
The driest month (with the least rainfall) is March (3.5").

Average rainfall days in September
Rota, Northern Mariana Islands, USA

Average rainfall days in September - Rota, Northern Mariana Islands, USA
  • Average rainfall days in September: 20 days

The month with the highest number of rainy days is August (23 days).
The month with the least rainy days is April (18 days).

Average sea temperature in September
Rota, Northern Mariana Islands, USA

Average sea temperature in September - Rota, Northern Mariana Islands, USA
  • Average sea temperature in September: 84°F

The best months for swimming (with the highest average sea temperature) are June, July, August, September, October and November (84°F).
The coldest months (with the lowest average sea temperature) are February and March (81°F).

Average daylight in September /
Average sunshine in September
Rota, Northern Mariana Islands, USA

Average daylight in September / Average sunshine in September - Rota, Northern Mariana Islands, USA
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

  • Average sunshine in September: 5h

The months with the most sunshine are March, April, May and June (Average sunshine: 7h).
The month with the least sunshine is October (Average sunshine: 4h).

Average UV index in September
Rota, Northern Mariana Islands, USA

Average UV index in September - Rota, Northern Mariana Islands, USA
  • Average UV index in September: 12

The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).

Rota, Northern Mariana Islands, USA

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