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Guam Island

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Guam Island Weather and climate

Data source：Meteostat
Update date：2025-10

Guam Island year round climate
  • Spring (March–May): Average 26.6–27.9°C, the climate is warm and pleasant, with very little rainfall (approx. 1.8-3.2mm per month), abundant sunshine, making it an excellent time for outdoor activities. Common activities: beach activities, snorkeling, diving, golf, exploring local cultural attractions. Recommended attire: light, breathable summer clothing, swimwear, sun hat, sunglasses, sunscreen.
  • Summer (June–August): Average 27.8–28.3°C, the warmest season of the year, with higher temperatures. Rainfall slightly increases but remains low (approx. 4.2-11.4mm per month), sunshine is still intense, and humidity is higher. Common activities: various water sports, beach volleyball, evening beach strolls. Recommended attire: moisture-wicking light clothing, shorts, T-shirts, sandals, sunscreen.
  • Autumn (September–November): Average 27.2–27.7°C, temperatures slightly drop but remain warm. Rainfall is relatively higher (approx. 9.0-24.1mm per month), September is the rainiest month, with occasional tropical showers that usually do not last too long. Common activities: exploring jungle trails, visiting museums, shopping, experiencing local cuisine. Recommended attire: light clothing, rain gear (light raincoat or foldable umbrella), sandals.
  • Winter (December–February): Average 26.1–27.8°C, temperatures are the lowest of the year but still very warm and comfortable, making it one of the driest seasons of the year (approx. 1.6-3.6mm per month), with abundant sunshine and pleasant sea breezes. Common activities: enjoying the beach, sailing, windsurfing, watching sunsets, participating in festive events. Recommended attire: light summer clothing, thin long-sleeved shirts or blouses for evening sea breezes, beach shoes.
Guam Island climatological average

Annual average temperature: approx. 27.4°C / Annual rainfall: approx. 93 mm / Summer humidity: 75-85% / Rainiest month: September

Guam Island monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
26.7°C
1.8
February
26.1°C
1.6
March
26.6°C
1.8
April
27.3°C
2.8
May
27.9°C
3.2
June
28.3°C
4.2
July
27.8°C
11.2
August
27.9°C
11.4
September
27.7°C
24.1
October
27.2°C
19
November
27.7°C
9
December
27.8°C
3.6
Guam Island weather for the next seven days
11/13
Thursday
Patchy rain nearby
28.9°C/27.2°C
11/14
Friday
Patchy rain nearby
29.2°C/27.1°C
11/15
Saturday
Patchy rain nearby
29.2°C/27.2°C
11/16
Sunday
Moderate rain
29°C/27.5°C
11/17
Monday
Moderate rain
29.1°C/27.4°C
11/18
Tuesday
Patchy rain nearby
28.9°C/27.1°C
11/19
Wednesday
Patchy rain nearby
28.7°C/27.3°C

Guam Island FAQ

Is Guam a good destination for tourists?
Yes, Guam is an excellent destination for tourists seeking a tropical escape. It offers beautiful white sand beaches and warm Pacific waters perfect for relaxation and various water activities like snorkeling and diving. Visitors can also immerse themselves in the rich Indigenous Chamorro culture and learn about the island's significant World War II history.
What are the main safety concerns for travelers in Guam?
While Guam is generally safe, travelers should be aware of potential natural hazards like earthquakes and tsunamis. Additionally, unexploded ordnances from World War II may be present in certain areas, and petty crime such as pickpocketing can occur. Exercising common sense is advised.
When is the best time to visit Guam for ideal weather?
The best months to visit Guam are between December and June, which is the dry season. During this period, you can expect less rain, cooler temperatures, and clear skies, making it perfect for exploring beaches and enjoying outdoor activities.
Why is Guam considered a good place to visit?
Guam is a good place to visit due to its stunning white sand beaches and clear, warm waters, providing a serene environment for relaxation. It's a paradise for water sports enthusiasts with great spots for swimming, snorkeling, and diving. The island also offers a unique cultural experience with its Chamorro heritage and historical sites.
Is it safe to travel to Guam for vacation?
Guam is considered a safe destination for travelers. With a little awareness and common sense, visitors can enjoy their trip to the island. While property crime can be higher than on the U.S. mainland, it is generally a secure place for tourism.