Guam is the closest U.S. territory to Taiwan, about 3.5 hours by plane. Temperatures are moderate throughout the year, with average temperatures ranging from 25°C to 30°C. The dry season (December to May) is the best time to travel, with clear and sunny days. The rainy season (June to November) is a good time to see coral reefs and marine life. Guam offers a wealth of water activities, cultural experiences and delicious food, perfect for families, girlfriends and couples.
Fish Eye Marine Park Dolphin Watching Half-Day Tour | Guam
We didn't see any dolphins. The next group also had extra tickets, so I think that's why they didn't see any either. Is the 90% chance of seeing them really true? The buffet was delicious and suited to Japanese tastes. The underwater aquarium was fantastic.
Anonymous user
Family
Data source: Meteostat・Last updated: 2025-09
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.
Annual average temperature: approx. 27.4°C / Annual rainfall: approx. 2758 mm / Summer humidity: 75%–85% / Rainiest month: September
| Month | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature | 26.7°C | 26.8°C | 27.1°C | 27.6°C | 28°C | 27.9°C | 27.6°C | 27.5°C | 27.6°C | 27.3°C | 27.8°C | 27.5°C |
| Rainfall (mm) | 188.3 | 75.3 | 79.3 | 143 | 316 | 185.7 | 253.3 | 368.3 | 428.3 | 405.3 | 155 | 161 |
| Date | 11/6Friday | 11/7Saturday | 11/8Sunday | 11/9Monday | 11/10Tuesday | 11/11Wednesday | 11/12Thursday |
|---|---|---|---|---|---|---|---|
| Weather |  Sunny |  Patchy rain nearby | Patchy rain nearby | Patchy rain nearby | Patchy rain nearby | Patchy rain nearby | Patchy rain nearby |
| High | 29.6°C | 29.1°C | 30.3°C | 30.5°C | 30.1°C | 29.8°C | 29.9°C |
| Low | 25.7°C | 25.3°C | 25.8°C | 25.4°C | 26.8°C | 27.1°C | 27.1°C |
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