September weather forecast and climate
Northern Mariana Islands, USA

Flag of Northern Mariana Islands, USA
Flag of Northern Mariana Islands, USA

Weather in September

September is hot and humid in the Northern Mariana Islands with daily showers in Saipan, Tinian, and Rota. The average precipitation is 10.7" (272mm) in the month, with periods of heavy rain.
The humidity is above 80%, and the average temperatures register between 75°F (23.9°C) and 84°F (28.9°C). The cloud cover is heavy in the absence of the northeasterly trade winds and restricts the sunlight to 5 hours a day. Hurricanes and tropical storms frequently visit the coasts and even raid the interior lands. Green sea turtles are a common nesting species on the soft coastal sands during the rainy months.
Tourist numbers are low during the wet season and open up opportunities for budget travelers. Expect plenty of rain in the forests and on mountain slopes that make paths slippery and muddy. The Northern Mariana Islands wear a cloak of greenery in September.
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