United States (Guam) Guam Weather in August — Climate Guide
August in Guam is very-high
August is very-high for Guam.
Korean summer break + typhoon season peak.
Travel score
Guam August Weather Stats
Avg High
30°C
Avg Low
25°C
Rainy Days
17
230mm total
Sunshine
6h
Daily avg
Humidity
80%
high
UV Index
11
Extreme
Wind
18 km/h
Gusts 40
Sea Temp
29°C
perfect
Crowds
Very busy
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
10 μg/m³
PM10
20 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
34°C
Nighttime
26°C
Humidity and wind affect how the actual temperature feels.
Wind
18 km/h
Max gust 40 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Korean summer break
- Sea 29°C
Cons
- Rainy 17 days
- Typhoon peak Aug-Oct
- Hotels surge
August Events & Festivals
- Korean summer break continued
- Typhoon season
Guam in August — Full Picture
Korean summer break + typhoon season peak.
What to Wear & What to Pack
Hot tropical + typhoon.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
29.7°C
24.3°C
9/mo
Summer (Jun·Jul·Aug)
Current30°C
25°C
15/mo
Autumn (Sep·Oct·Nov)
29.7°C
25°C
15.7/mo
Winter (Dec·Jan·Feb)
28°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 August Hotel Picks
Frequently Asked Questions
Is August a good time to visit Guam?
Guam in August is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Guam in August?
Guam August averages a high of 30°C and a low of 25°C.
Does it rain much in Guam in August?
Guam August averages 230mm of rainfall over about 17 rainy days.
What should I wear in Guam in August?
Hot tropical + typhoon.
What time are sunrise and sunset in Guam in August?
Guam August sunrise is 06:30 and sunset is 18:35, with 12h 5min of daylight.
What's the air quality like in Guam in August?
Guam August air quality (AQI) averages 30, rated Good. PM2.5 averages 10μg/m³.
What activities are recommended in Guam in August?
In August, Guam is great for Tumon Bay, Indoor cultural, Korean BBQ.
Is August peak season in Guam?
Guam August 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.