United States (Guam) Guam Weather in January — Climate Guide
January in Guam is very-high
January is very-high for Guam.
Dry peak + Korean Lunar New Year peak. Korean winter escape.
Travel score
Guam January Weather Stats
Avg High
28°C
Avg Low
23°C
Rainy Days
10
130mm total
Sunshine
7h
Daily avg
Humidity
78%
moderate
UV Index
11
Extreme
Wind
15 km/h
Gusts 25
Sea Temp
27°C
perfect
Crowds
Very busy
At attractions
January 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
23°C
Humidity and wind affect how the actual temperature feels.
Wind
15 km/h
Max gust 25 km/h
Activities Recommended for January
January Travel Pros & Cons
Pros
- Climate 23-28°C ideal
- Sunny 80%
- Korean winter escape
Cons
- Hotels surge 2x
- Some rain
January Events & Festivals
- Christmas-New Year extended
- Korean Lunar New Year
Guam in January — Full Picture
Dry peak + Korean Lunar New Year peak. Korean winter escape.
What to Wear & What to Pack
Tropical dry. Swimsuit + cover-up + reef-safe SPF 50.
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 January Hotel Picks
Frequently Asked Questions
Is January a good time to visit Guam?
Guam in January is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Guam in January?
Guam January averages a high of 28°C and a low of 23°C.
Does it rain much in Guam in January?
Guam January averages 130mm of rainfall over about 10 rainy days.
What should I wear in Guam in January?
Tropical dry. Swimsuit + cover-up + reef-safe SPF 50.
What time are sunrise and sunset in Guam in January?
Guam January sunrise is 06:50 and sunset is 18:10, with 11h 20min of daylight.
What's the air quality like in Guam in January?
Guam January air quality (AQI) averages 30, rated Good. PM2.5 averages 10μg/m³.
What activities are recommended in Guam in January?
In January, Guam is great for Tumon Bay, Underwater World, Cocos Island.
Is January peak season in Guam?
Guam January 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.