Northern Mariana Islands Weather & Climate: Monthly Averages

Monthly climate averages for Northern Mariana Islands, temperatures, rainfall and the best time to visit.

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Garapan Saipan Rota

Climate overview of Northern Mariana Islands

The Northern Mariana Islands have a tropical rainforest climate, where there is a dry season and a wet period with significant amounts of rainfall. The dry season begins in December and continues into June. During this period, there is less precipitation than during the rainy season, which lasts from July through November. The months of August and September are the wettest months of the year, averaging 300 mm (12 in) to almost 400 mm (16 in).

The Northern Mariana Islands lie in an area where tropical cyclones can occur. These form over the Pacific Ocean in the second half of the year and can occasionally come near the Northern Mariana Islands. The hurricane season is approximately from June to December, but cyclones can occur outside of this period. The winds during cyclones can be enormously powerful, with devastating consequences.

The best time to go to the Northern Mariana Islands is from January to May. These are the months with the least amounts of rain and the smallest chance of hurricanes.

Explore Northern Mariana Islands by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Garapan Saipan Rota

Day temperature (°C)

Monthly rainfall (mm)

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Climate map

Average daily temperature, monthly rainfall & sunshine hours across cities.

Avg day temp (°C)

0° 32°

Regional climate differences

Explore the climate diversity across Northern Mariana Islands.

Saipan

26°C (79°F) – 30°C (86°F)

1894 mm (75 in) / year

Based on Garapan

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Average daytime and nighttime temperatures, yearly rainfall and sunshine.


Garapan	28°C (82°F) – 30°C (86°F)	26°C (79°F) – 27°C (81°F)	1894 mm (75 in)	—
Saipan	28°C (82°F) – 30°C (86°F)	26°C (79°F) – 27°C (81°F)	1897 mm (75 in)	—
Rota	28°C (82°F) – 30°C (86°F)	26°C (79°F) – 27°C (81°F)	2033 mm (80 in)	—

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FAQ

What is the best time to visit Northern Mariana Islands?

The warmest month in Garapan is June, with daytime highs of 30°C (86°F). Garapan is the sunniest destination, with 0 hours of sunshine in January. Explore Northern Mariana Islands weather by month for a detailed breakdown.

What temperatures can I expect in Northern Mariana Islands?

Garapan is the warmest destination, reaching 30°C (86°F) in June with nights around 27°C (81°F). Garapan is the coolest, with February daytime highs of just 28°C (82°F) and nights dropping to 26°C (79°F). Temperatures are relatively stable throughout the year. See the city comparison for a full overview.

How much rain does Northern Mariana Islands get?

Rainfall varies across Northern Mariana Islands. Rota is the wettest, receiving 2033 mm (80 in) per year, with August the wettest month at 358 mm (14 in). Garapan is the driest at 1894 mm (75 in) per year. Use the climate map to explore rainfall patterns across regions.

How sunny is Northern Mariana Islands?

Garapan is the sunniest destination in Northern Mariana Islands, enjoying 0 hours of sunshine per year, with January the brightest month at 0 hours. Overcast skies are common, especially during winter months. Compare sunshine across cities in the charts above.

What is the climate like across Northern Mariana Islands?

Garapan has warm summers reaching 30°C (86°F) in June and warm winters dropping to 28°C (82°F), with 0 hours of sunshine and 1894 mm (75 in) of rain per year. Saipan has warm summers reaching 30°C (86°F) in June and warm winters dropping to 28°C (82°F), with 0 hours of sunshine and 1897 mm (75 in) of rain per year. Rota has warm summers reaching 30°C (86°F) in June and warm winters dropping to 28°C (82°F), with 0 hours of sunshine and 2033 mm (80 in) of rain per year. Explore the climate charts and comparison table for more cities.