Alamagan

Island Volcanic island in Northern Mariana Islands

A volcanic island in the Northern Mariana chain, Alamagan has steep slopes, limited habitation and seabird colonies; access is by private boat or research expeditions rather than regular ferries.

Main image
Alamagan
17.5950, 145.8220

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.

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.

Temperature & Rainfall
Temperature Range
30°
Warmest Month
21°
Coldest Month
Monthly Conditions

January

January is warm with highs of 27°C and lows of 22°C. Significant rainfall (107 mm) and breezy conditions.

Comfort

24°
Feels Like Warm
24°C
Temperature
22° 27°

Weather

107 mm
Rainfall
6.3 m/s
Wind
Breezy

February

February is mild with highs of 26°C and lows of 21°C. Moderate rainfall (77 mm) and breezy conditions.

Comfort

24°
Feels Like Mild
24°C
Temperature
21° 26°

Weather

77 mm
Rainfall
6.0 m/s
Wind
Breezy

March

March is warm with highs of 27°C and lows of 22°C. Moderate rainfall (71 mm) and breezy conditions.

Comfort

25°
Feels Like Warm
25°C
Temperature
22° 27°

Weather

71 mm
Rainfall
6.2 m/s
Wind
Breezy

April

April is warm with highs of 28°C and lows of 23°C. Regular rainfall (85 mm) and breezy conditions.

Comfort

26°
Feels Like Warm
26°C
Temperature
23° 28°

Weather

85 mm
Rainfall
6.1 m/s
Wind
Breezy

May

May is warm with highs of 29°C and lows of 24°C. Regular rainfall (93 mm).

Comfort

27°
Feels Like Warm
27°C
Temperature
24° 29°

Weather

93 mm
Rainfall
5.1 m/s
Wind
Light Breeze

June

June is the warmest month with highs of 30°C and lows of 25°C. Significant rainfall (105 mm).

Comfort

27°
Feels Like Warm
27°C
Temperature
25° 30°

Weather

105 mm
Rainfall
5.0 m/s
Wind
Light Breeze

July

July is warm with highs of 30°C and lows of 25°C. Heavy rain (221 mm).

Comfort

27°
Feels Like Warm
27°C
Temperature
25° 30°

Weather

221 mm
Rainfall
4.5 m/s
Wind
Light Breeze

August

August is warm with highs of 30°C and lows of 25°C. Heavy rain (263 mm).

Comfort

27°
Feels Like Warm
27°C
Temperature
25° 30°

Weather

263 mm
Rainfall
4.7 m/s
Wind
Light Breeze

September

September is warm with highs of 30°C and lows of 25°C. The wettest month with heavy rain (278 mm).

Comfort

27°
Feels Like Warm
27°C
Temperature
25° 30°

Weather

278 mm
Rainfall
4.4 m/s
Wind
Light Breeze

October

October is warm with highs of 29°C and lows of 24°C. Heavy rain (232 mm).

Comfort

27°
Feels Like Warm
27°C
Temperature
25° 29°

Weather

232 mm
Rainfall
5.0 m/s
Wind
Light Breeze

November

November is warm with highs of 28°C and lows of 24°C. Significant rainfall (157 mm).

Comfort

26°
Feels Like Warm
26°C
Temperature
24° 29°

Weather

157 mm
Rainfall
5.5 m/s
Wind
Light Breeze

December

December is warm with highs of 27°C and lows of 23°C. Significant rainfall (122 mm) and breezy conditions.

Comfort

25°
Feels Like Warm
25°C
Temperature
23° 27°

Weather

122 mm
Rainfall
6.1 m/s
Wind
Breezy

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