Alamagan at a Glance
When to Go
Best Time to Visit Alamagan
Best visited in the dry season for safer sea travel; always plan for sudden weather changes and limited facilities.
Dry season
December-June · 25-30°C (77-86°F)
Calmer seas and more reliable small-boat access; still remote and weather-dependent.
Wet season
July-November · 26-31°C (79-88°F)
Higher rainfall and hurricane risk; sea conditions often make landings impossible.
Weather & Climate near Alamagan
Climate
Tropical climate with consistently warm temperatures year-round. Temperatures range from 21°C to 30°C. Abundant rainfall (1811 mm/year), wettest in September.
Air Quality:
AQI 12
Good
Temperature & Rainfall
Temperature Range
30°
Warmest Month
21°
Coldest Month
Monthly Conditions
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | - | 22° - 27° | 24° | 107 mm | - | - | 6.3 m/s | - | - |
| February | - | 21° - 26° | 24° | 77 mm | - | - | 6.0 m/s | - | - |
| March | - | 22° - 27° | 25° | 71 mm | - | - | 6.2 m/s | - | - |
| April | - | 23° - 28° | 26° | 85 mm | - | - | 6.1 m/s | - | - |
| May | - | 24° - 29° | 27° | 93 mm | - | - | 5.1 m/s | - | - |
| June | - | 25° - 30° | 27° | 105 mm | - | - | 5.0 m/s | - | - |
| July | - | 25° - 30° | 27° | 221 mm | - | - | 4.5 m/s | - | - |
| August | - | 25° - 30° | 27° | 263 mm | - | - | 4.7 m/s | - | - |
| September | - | 25° - 30° | 27° | 278 mm | - | - | 4.4 m/s | - | - |
| October | - | 25° - 29° | 27° | 232 mm | - | - | 5.0 m/s | - | - |
| November | - | 24° - 29° | 26° | 157 mm | - | - | 5.5 m/s | - | - |
| December | - | 23° - 27° | 25° | 122 mm | - | - | 6.1 m/s | - | - |
Getting There & Around
How to Get to Alamagan
Alamagan is reached by charter or supply vessels from Saipan; no regular public transport exists. Travel is weather-dependent and can take several hours. Landing sites are limited and often rough; visitors must coordinate with local authorities and experienced skippers.
Tips for Visiting Alamagan
- Alamagan is remote and uninhabited - organize transport with experienced local boat operators from Saipan and plan for rough seas.
- Bring ample supplies and reliable communication equipment; there are no visitor facilities.
- Respect the island's natural environment; it's part of the Northern Mariana Islands' protected areas and has nesting seabirds.