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Guam

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Guam Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Guam year round climate

  • Spring (March–May): Average 27.1–28.0°C, warm and humid climate, rainfall gradually increases. Common activities: scuba diving, snorkeling, beach activities. Recommended clothing: light short-sleeved clothing, shorts, swimwear, sun protection clothing.
  • Summer (June–August): Average 27.5–27.9°C, hot and humid, frequent rainfall, occasional tropical storms. Common activities: water sports, beach leisure, exploring the island interior. Recommended clothing: light and breathable clothing, shorts, sandals, sunscreen.
  • Autumn (September–November): Average 27.3–27.8°C, the climate remains warm and humid, with higher rainfall, peak of the rainy season. Common activities: viewing tropical plants, visiting historical sites, enjoying a relaxing island life. Recommended clothing: light and breathable clothing, rain gear.
  • Winter (December–February): Average 26.7–27.5°C, the climate is relatively drier, with less rainfall, but still warm and humid. Common activities: scuba diving, snorkeling, beach leisure. Recommended clothing: light long-sleeved clothing, long pants or shorts.

Guam climatological average

Annual average temperature: approx. 27.4°C / Annual rainfall: approx. 2758 mm / Summer humidity: 75%–85% / Rainiest month: September

Guam monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
26.7°C
188.3
February
26.8°C
75.3
March
27.1°C
79.3
April
27.6°C
143
May
28°C
316
June
27.9°C
185.7
July
27.6°C
253.3
August
27.5°C
368.3
September
27.6°C
428.3
October
27.3°C
405.3
November
27.8°C
155
December
27.5°C
161

Guam weather for the next seven days

9/16
Wednesday
Light rain shower
28.9°C/27.3°C
9/17
Thursday
Patchy rain nearby
29.2°C/27°C
9/18
Friday
Patchy rain nearby
29.3°C/27.5°C
9/19
Saturday
Light rain shower
29.5°C/27.6°C
9/20
Sunday
Patchy rain nearby
29.7°C/27.2°C
9/21
Monday
Patchy rain nearby
29.4°C/27.2°C
9/22
Tuesday
Light rain shower
28.5°C/27°C

Guam Frequently Asked Questions and Useful Information for Travel

Is Guam a good destination for tourists?

Yes, Guam is an excellent destination for tourists, offering a captivating mix of beautiful tropical beaches, exciting water activities like snorkeling and diving, a rich historical tapestry, and a warm, welcoming culture. It provides a relaxed yet convenient tropical getaway with accessible public beaches and resort amenities.

Can U.S. citizens travel to Guam?

Yes, U.S. citizens can travel to Guam because it is a U.S. territory. While U.S. citizens do not need a passport to travel to Guam, they are required to present other forms of identification, such as a government-issued photo ID.

What is the best time of year to visit Guam?

The best months to visit Guam are from December to June, which is the dry season. During this period, you'll experience pleasant, cooler temperatures and fewer rain showers, making it ideal for exploring the island's beaches and attractions.

What makes Guam's snorkeling and diving so special?

Guam's waters are known for their exceptional clarity and warmth, offering fantastic opportunities for snorkeling and diving. Popular spots like the Piti Bomb Holes Reserve provide vibrant marine life and fascinating underwater landscapes, making it a paradise for water enthusiasts.

What kind of cultural experiences can I expect in Guam?

Visitors to Guam can immerse themselves in the Indigenous Chamorro culture, learning about its unique traditions, language, and history. The island also holds significant historical importance, particularly its role during World War II, offering a deep dive into its past.