Climate in Northern Mariana Islands

Northern Mariana Islands has a highly diverse climate, with major differences between regions. Annual temperatures range from lows of -1°C in the coldest regions to highs of 31°C in the warmest areas. Rainfall is fairly uniform nationwide at around 121mm per year. The warmest areas are warm year-round while the coldest regions remain cool, making Northern Mariana Islands a country of sharp climate contrasts.

Temperature patterns across Northern Mariana Islands vary by region, with distinct differences between areas. The Central is the warmest part of the country, with peak temperatures reaching 31°C and an annual average of 21°C. Cooler conditions are found in the Central, where winter lows drop to -1°C and an annual average of 4°C. This 18°C difference in annual averages between regions means travellers can experience vastly different conditions depending on which part of Northern Mariana Islands they visit. Regional temperature differences remain relatively consistent across seasons, with around 19°C of variation in both summer and winter. For example, San Jose Village in the Tinian Municipality averages 21°C annually, while Saipan in the Saipan Municipality averages 4°C.

Rainfall is relatively uniform across Northern Mariana Islands, with most regions receiving around 121mm per year. The Central receives the most rainfall, at approximately 132mm annually. The Central is the driest, with around 110mm per year. Most regions experience a winter-dominant rainfall pattern, with considerably more precipitation falling during the colder months. The Central sees the most snowfall, with up to 7cm annually, while other parts of the country receive little to none. Rainfall is similar across regions, so travellers can expect comparable conditions regardless of which part of Northern Mariana Islands they visit.