September weather forecast
Saipan, Northern Mariana Islands, USA

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Beautiful clear waters and white sandy beaches around the stunning Bird Island in Saipan, Northern Mariana Islands
Beautiful clear waters and white sandy beaches around the stunning Bird Island in Saipan, Northern Mariana Islands

Weather in September

September features substantial yet decreasing rainfall in Saipan with the precipitation level at 11.7" (297mm). Comparing temperatures, lows dip slightly to 75°F (23.9°C), while the maximum soars to a stable 83.7°F (28.7°C). The UV index marches confidently at a value of 12, just as in the previous months. October, however, promises a relief from the monsoonal rains headed Saipan's direction.

Temperature

With the onset of September, a modest change to a still moderately hot 83.8°F (28.8°C) from August's 84°F (28.9°C) is noted in high-temperature. In Saipan, the nighttime temperature shows a slight difference from the daytime high, averaging to a still warm 75°F (23.9°C) during September.

Rainfall

In Saipan, in September, during 19 rainfall days, 11.65" (296mm) of precipitation is typically accumulated. Throughout the year, there are 244 rainfall days, and 83.39" (2118mm) 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.
Note: Surface water temperatures between 77°F (25°C) and 84.2°F (29°C) offer outstanding conditions for any water activity, providing extreme pleasure for extended periods.

Daylight

In September, the average length of the day in Saipan is 12h and 13min.
On the first day of the month, sunrise is at 6:04 am and sunset at 6:29 pm. On the last day of September, sunrise is at 6:06 am and sunset at 6:07 pm ChST.

Sunshine

The months with the least sunshine are August through December, with an average of 5h of sunshine.

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 ultimate health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: An average UV index of 12 in September transforms into this advice:
Ensure every key safety measure. People with light skin might sustain burns in fewer than 5 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Despite the clouds, sunscreen with an SPF of at least 30 should be used liberally and reapplied frequently, especially after a swim or outdoor workout. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.

Frequently asked questions

Is it hot in Saipan during September?

The high-temperature, in September, in Saipan, records 83.8°F (28.8°C), while the low-temperature is 75°F (23.9°C).

How many days does it rain in September?

In Saipan, in September, during 19 rainfall days, 11.65" (296mm) of precipitation is typically accumulated.

What months are the ocean warmest?

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

What is the ocean temperature in September in Saipan?

In Saipan, Northern Mariana Islands, the average seawater temperature in September is 84.2°F (29°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Saipan have in September?

In Saipan, the average day length in September is 12h and 13min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:04 am and sunset at 6:29 pm. On the last day of the month, sunrise is at 6:06 am and sunset at 6:07 pm ChST.

What is the month with the least sunshine in Saipan?

August through December, with an average of 5h of sunshine, are months with the least sunshine.

How long on average sun shines in September?

In September, the average sunshine duration is 5h.

When is the highest UV index?

February through September, with an average maximum UV index of 12, are months with the highest UV index.

How high is the UV index in September?

In Saipan, the average daily maximum UV index in September is 12. A UV Index reading of 11, and higher, represents an extreme health vulnerability from unsafe exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Saipan, Northern Mariana Islands, USA

Average temperature in September - Saipan, Northern Mariana Islands, USA
  • Average high temperature in September: 83.8°F

The warmest month (with the highest average high temperature) is June (85°F).
The month with the lowest average high temperature is February (79.7°F).

  • Average low temperature in September: 75°F

The month with the highest average low temperature is May (75.5°F).
The coldest month (with the lowest average low temperature) is February (72.9°F).

Average rainfall in September
Saipan, Northern Mariana Islands, USA

Average rainfall in September - Saipan, Northern Mariana Islands, USA
  • Average rainfall in September: 11.7"

The wettest month (with the highest rainfall) is August (12.4").
The driest month (with the least rainfall) is March (2.4").

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

Average rainfall days in September - Saipan, Northern Mariana Islands, USA
  • Average rainfall days in September: 19 days

The months with the highest number of rainy days are January and December (23 days).
The month with the least rainy days is June (17 days).

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

Average sea temperature in September - Saipan, 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
Saipan, Northern Mariana Islands, USA

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

The month with the longest days is June (Average daylight: 13h and 0min).
The month with the shortest days is December (Average daylight: 11h and 12min).

  • Average sunshine in September: 5h

The months with the most sunshine are March, April, May and June (Average sunshine: 7h).
The months with the least sunshine are August, September, October, November and December (Average sunshine: 5h).

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

Average UV index in September - Saipan, 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 months with the lowest UV index are November and December (UV index 9).

Saipan, Northern Mariana Islands, USA

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