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Guam Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-10

Guam year round climate

  • Spring (March–May): Average 26.5–28°C. The climate is dry and warm with very low rainfall and abundant sunshine, making it one of the most comfortable seasons. Common activities: Beach activities, snorkeling, diving, exploring island scenery. Recommended attire: Light, breathable short-sleeved shirts, shorts, swimwear, sun protection, sun hat.
  • Summer (June–August): Average 27.5–28.5°C. Temperatures reach their peak, and it is generally hot. Rainfall slightly increases but remains very low, humidity is higher, and the sun is intense. Common activities: Various water sports, beach volleyball, night market experiences, outdoor dining. Recommended attire: Extremely light, breathable cotton and linen clothing, short-sleeved shirts, shorts, swimwear, strong sunscreen.
  • Autumn (September–November): Average 27–28°C. Temperatures remain hot. September is the month with relatively higher rainfall, but overall figures are still very low. Humidity is high, and occasional short showers may occur. Common activities: Diving, golf, shopping, visiting cultural attractions. Recommended attire: Light, breathable clothing, light long-sleeved shirts (for indoor air conditioning), sandals, simple rain gear.
  • Winter (December–February): Average 26–27.5°C. Temperatures are slightly milder. This is the period with the lowest annual rainfall, and the weather is extremely dry and comfortable. Sunshine is abundant, making it the most popular tourist season. Common activities: Relaxing on the beach, exploring historical sites, participating in festive events, seasonal whale watching. Recommended attire: Short-sleeved shirts, shorts, light dresses, light jacket (for mornings and evenings), sun protection.

Guam climatological average

Annual average temperature: approx. 27.4°C / Annual rainfall: approx. 93 mm / Summer humidity: 70-85% / Rainiest month: September

Guam 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 weather for the next seven days

10/10
Saturday
Sunny
28.2°C/26.1°C
10/11
Sunday
Overcast
28.4°C/26.5°C
10/12
Monday
Patchy rain nearby
28.5°C/26.3°C
10/13
Tuesday
Sunny
28.4°C/25.7°C
10/14
Wednesday
Sunny
28.4°C/25.3°C
10/15
Thursday
Sunny
28.2°C/25.6°C
10/16
Friday
Patchy rain nearby
28.3°C/26.1°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 seeking a blend of stunning tropical beaches, diverse water activities like snorkeling and diving, a rich historical background, and a warm, welcoming culture. It provides a relaxing yet convenient tropical escape with accessible public beaches and resort amenities.

Can U.S. citizens travel to Guam?

Yes, U.S. citizens can travel to Guam as it is a U.S. territory. While a passport is not required for U.S. citizens, they must present other forms of identification, such as a government-issued photo ID. It is advisable to carry a copy of your round-trip tickets or confirmed travel itinerary.

Should I consider visiting Guam over Hawaii?

Guam offers a more budget-friendly, serene, and culturally immersive experience with excellent snorkeling conditions and warmer, clearer waters. If you seek a quieter, more authentic island vibe and are mindful of costs, Guam is a great choice. Hawaii, on the other hand, provides a more familiar, convenient, and bustling American experience with more extensive infrastructure and major attractions, but typically at a higher price point.

What is the best time of year to visit Guam?

The ideal time to visit Guam is during the dry season, from December to June. This period offers pleasant, cooler temperatures and minimal rainfall, making it perfect for exploring the island's beautiful beaches and engaging in outdoor activities. The shoulder months of April to June can also be a good option, balancing warm, sunny weather with fewer crowds and potentially better prices.

What are some key attractions in Guam?

Guam boasts several must-see attractions including the pristine white sand beaches like Tumon Beach, the historical Latte Stone Park showcasing ancient Chamorro structures, and the Piti Bomb Holes Marine Preserve for exceptional snorkeling and diving opportunities. Exploring the island's rich World War II history at sites like the Asan Bay Overlook is also highly recommended.