Map from Google - Northern_Mariana_Islands
The climate of the Northern Mariana Islands, U.S. territory in the Pacific Ocean, is tropical
, hot and humid throughout the year, with a relatively cool and dry season from December to June, and a warmer and rainy season from July to November.
are stable throughout the year, especially in the southern islands (which are the only inhabited ones), where the daytime average goes from 28/29 °C in the coolest period, to 30/31 °C in the warmest. The heat is sultry but tempered by the trade winds.
Here are the average temperatures of the capital Saipan.
Average temperatures - Saipan
is abundant, so that it reaches 2,400 millimetres per year in the southernmost island (Rota), and 2,000 mm in Saipan and Tinian. The wettest months are August, September and October, with more than 250 mm per month, while in the least rainy months, from February to May, from 70 to 100 mm of rain per month fall.
Here is the average precipitation in Saipan.
Average precipitation - Saipan
The other islands, located north of the three permanently inhabited ones, are gradually cooler in winter, and generally drier throughout the year, although along the windward slopes, exposed to the north-east trade winds (being volcanic islands, with some elevations in the interior), the rains may become locally more abundant.
The amount of sunshine
is never excellent, because there's always the chance to see some cloudiness, which can develop and lead to thunderstorms, but it's never bad either, because even in the rainiest months, between showers, the sun comes out.
The Northern Mariana Islands are located in the path of typhoons
, the tropical cyclones of south-east Asia, towards which they normally move after passing over the islands. The period in which they typically occur is from mid-May to mid-November, although at times they have passed at other periods, in April (typhoon Isa in 1997, Kong-rey in 2007), December (Pongsona in 2002), and even January (Roy in 1988).
The sea temperature is warm enough for swimming all year round: it drops to 27 °C in February and March.
Sea temperature - Saipan
When to go
The best time to visit the Northern Marianas runs from January to April
, being the least warm and rainy, and even outside the typhoon season. February and March are the best months of all.
is warm all year round.
What to pack
All year round, light clothes, of natural fibres, sun hat, a scarf for the breeze, a light sweatshirt for the evening, light raincoat or umbrella.
For the reef, equipment for snorkeling, water shoes or rubber soled shoes.