United States (Guam) Guam Weather in December — Climate Guide
December in Guam is very-high
December is very-high for Guam.
Christmas-New Year canonical peak. Korean winter escape.
Travel score
Guam December Weather Stats
Avg High
28°C
Avg Low
24°C
Rainy Days
12
130mm total
Sunshine
7h
Daily avg
Humidity
78%
moderate
UV Index
10
Very high
Wind
15 km/h
Gusts 25
Sea Temp
27°C
perfect
Crowds
Very busy
At attractions
December Sunrise & Sunset
Air Quality
PM2.5
10 μg/m³
PM10
20 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
31°C
Nighttime
24°C
Humidity and wind affect how the actual temperature feels.
Wind
15 km/h
Max gust 25 km/h
Activities Recommended for December
December Travel Pros & Cons
Pros
- Christmas peak
- Korean winter escape
- Climate 24-28°C ideal
Cons
- Hotels surge 2x
December Events & Festivals
- Christmas-New Year peak
Guam in December — Full Picture
Christmas-New Year canonical peak. Korean winter escape.
What to Wear & What to Pack
Tropical dry.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
29.7°C
24.3°C
9/mo
Summer (Jun·Jul·Aug)
30°C
25°C
15/mo
Autumn (Sep·Oct·Nov)
29.7°C
25°C
15.7/mo
Winter (Dec·Jan·Feb)
Current28°C
23.3°C
10.3/mo
Guam Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 28° | 23° | 10d·130mm | 7h | 78% | 11 | Very busy | Peak |
| February (Best) | 28° | 23° | 9d·100mm | 7h | 76% | 11 | Very busy | Peak |
| March (Best) | 29° | 24° | 8d·80mm | 8h | 76% | 12 | Very busy | Peak |
| April (Best) | 30° | 24° | 8d·90mm | 9h | 76% | 12 | Busy | Peak |
| May (Best) | 30° | 25° | 11d·130mm | 8h | 77% | 12 | Very busy | Peak |
| 30° | 25° | 13d·145mm | 7h | 78% | 12 | Busy | Shoulder | |
| 30° | 25° | 15d·200mm | 7h | 79% | 11 | Very busy | Peak | |
| 30° | 25° | 17d·230mm | 6h | 80% | 11 | Very busy | Peak | |
| 30° | 25° | 17d·250mm | 6h | 80% | 11 | Busy | Shoulder | |
| 30° | 25° | 16d·230mm | 7h | 79% | 11 | Busy | Shoulder | |
| November (Best) | 29° | 25° | 14d·175mm | 7h | 78% | 11 | Busy | Shoulder |
| December (Best) | 28° | 24° | 12d·130mm | 7h | 78% | 10 | Very busy | Peak |
View Other Months
Guam December Hotel Picks
Frequently Asked Questions
Is December a good time to visit Guam?
Guam in December is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Guam in December?
Guam December averages a high of 28°C and a low of 24°C.
Does it rain much in Guam in December?
Guam December averages 130mm of rainfall over about 12 rainy days.
What should I wear in Guam in December?
Tropical dry.
What time are sunrise and sunset in Guam in December?
Guam December sunrise is 06:40 and sunset is 18:00, with 11h 20min of daylight.
What's the air quality like in Guam in December?
Guam December air quality (AQI) averages 30, rated Good. PM2.5 averages 10μg/m³.
What activities are recommended in Guam in December?
In December, Guam is great for Tumon Bay illumination, Underwater World, Cocos Island.
Is December peak season in Guam?
Guam December crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Guam
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.