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🇬🇺 Guam

Flag of GuamNational Flag

Geography & Borders

This country has no land borders.

Introduction & Background

Guam (/ˈɡwɑːm/ⓘ; Template:Lang-ch Template:IPA-ch) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean.45 It is the westernmost point and territory of the United States (reckoned from the geographic center of the U.S.); its capital Hagåtña (144°45'00"E) lies further west than Melbourne, Australia (144°57'47"E). In Oceania, Guam is the largest and southernmost of the Mariana Islands and the largest island in Micronesia. Guam's capital is Hagåtña, and the most populous village is Dededo.

People born on Guam are American citizens but have no vote in the United States presidential elections while residing on Guam and Guam delegates to the United States House of Representatives have no vote on the floor. Indigenous Guamanians are the Chamoru, historically known as the Chamorro, who are related to the Austronesian peoples of Indonesia, the Philippines, Malaysia, Taiwan, Micronesia, and Polynesia. As of 2022, Guam's population is 168,801. Chamoros are the largest ethnic group, but a minority on the multi-ethnic island. The territory spans 210 square miles (540km2; 130,000 acres) and has a population density of 775 per square mile (299/km2). The Chamoro people settled the island approximately 3,500 years ago. Portuguese explorer Ferdinand Magellan, while in the service of Spain, was the first European to visit the island on March 6, 1521. Guam was colonized by Spain in 1668. Between the 16th and 18th centuries, Guam was an important stopover for the Spanish Manila Galleons. During the Spanish–American War, the United States captured Guam on June 21, 1898. Under the Treaty of Paris, signed December 10, 1898, Spain ceded Guam to the U.S. effective April 11, 1899.

Key Information
AttributeDetails
Official Name
Guam
Capital
Hagåtña
Continent
Oceania
Region / Subregion
Oceania / Micronesia
Population
153,836
Area
549 km²
Languages
Chamorro, English, Spanish
Currencies
United States dollar ($) [USD]
Cost of Living
50 / 100 (Moderate)
Price per Coffee
$2.50
Price per Meal
$11.25
Timezones
UTC+10:00 (CHST)
Bounding Box
Min: (13.36° N, 144.68° E)
Max: (13.57° N, 144.89° E)
Climate
Temperate
Terrain
Vast dry deserts and plains, volcanic islands with rugged mountains, and coral atolls

Geography & Climate

Climate, weather, and air quality data are based on historical records for the coordinates of the capital city, Hagatna.

Temperature (2025)

20°30°
Jan
27.3° / 29°
Feb
26.6° / 28.5°
Mar
26.8° / 28.5°
Apr
27° / 28.9°
May
27.2° / 29.2°
Jun
26.8° / 29.1°
Jul
26.7° / 29°
Aug
26.2° / 29°
Sep
26.2° / 28.6°
Oct
26.5° / 29.2°
Nov
27.5° / 29.5°
Dec
27.1° / 29.1°

Precipitation & Snow (2025)

43Jan
37Feb
58Mar
32Apr
94May
480Jun
459Jul
357Aug
465Sep
368Oct
209Nov
110Dec
Rain (mm) Snow (cm)

Atmospheric Pressure (2025)

1010.9+0.3Jan
1012.1+1.5Feb
1011.7+1.1Mar
1011.4+0.8Apr
1011+0.4May
1010.8+0.2Jun
1009.3-1.3Jul
1010.4-0.2Aug
1010.9+0.3Sep
1010.2-0.4Oct
1009.3-1.3Nov
1009.6-1Dec

Thunderstorm Days (2025)

0Jan
0Feb
0Mar
0Apr
0May
0Jun
0Jul
0Aug
0Sep
0Oct
0Nov
0Dec

Wind Speed (2025)

Jan
32.8
Feb
35.3
Mar
31.5
Apr
27.7
May
27.2
Jun
25.1
Jul
27.8
Aug
26.3
Sep
26.2
Oct
28.2
Nov
35.5
Dec
31.5

Air Quality — Monthly Averages (2025)

MetricJanFebMarAprMayJunJulAugSepOctNovDec
PM2.5 μg/m³6.97.27.36.14.93.94.23.433.85.56.1
PM10 μg/m³10.911.411.79.98.16.16.45.34.768.99.7
O₃ μg/m³5871.95648.736.431.128.52624.933.337.357.4
NO₂ μg/m³0.10.10.10.10.10.10.10.10.10.10.10.1
SO₂ μg/m³0.40.40.20.20.10.10.10.10.10.10.20.3
CO μg/m³99150126126110918582798795110

Pollen Levels — Monthly (2025)

Pollen data is negligible or unavailable for this location.

⛰️ Highest Elevation

Mount Lamlam
▲
Mount Lamlam406 m / 1,332 ft
📷 Unknown

  • Map Locations: Google Maps | OpenStreetMap

People & Society

Total Population166,506Density: 308.34 / km²
Annual Growth Rate+0.8%Moderate Growth
Life Expectancy77.21 yrsAverage lifespan at birth
Fertility Rate2.78Births per woman



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