Guam in August has hot conditions, with highs reaching 28.5°C (83°F) and afternoons the warmest part of the day. Rain falls on about 29 days this month, totalling around 311 mm.
This month falls at the end of Summer.
Temperature
29°C / 27°C
Guam Weather in August 2026
Monthly climate averages for Hagåtña. Based on 10-year ERA5 reanalysis data.
Am Tropical Monsoon
Climate Overview
Monthly August Averages
Feels Like
34°C / 30°C
Rain
29 days · 311 mm
Sunshine
9.4h / day
Humidity
83% — Very Muggy
Wind
23 km/h
Wind Direction
ESE (109°)
Gusts
33 km/h
Daylight
12.6 h
Cloud Cover
89%
Clear Sky Days
0.2
Dew Point
24°C — Oppressive
Moon Phase
Waxing Crescent · 3%
Seasonal Demand
Very Quiet (1/5)
Sun Position
Sunrise 06:10
Daylight 12.6h
Sunset 18:45
What to Expect
Daytime temperatures around 29°C (83°F) are ideal for full-day outdoor exploration. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Rain most often builds later in the day, so mornings are typically the driest window and afternoon showers are more likely.
Weather conditions this month are less ideal compared to other times of the year. Indoor activities or shorter outings may be more comfortable.
Pros
- Abundant sunshine for exploring and outdoor fun
- Quieter period with less favourable weather
Cons
- Frequent rain may disrupt outdoor activities
- High humidity makes the heat feel oppressive
What to Wear
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces. A waterproof jacket and shoes are non-negotiable — showers are frequent.
Packing List
UmbrellaWaterproof jacketWaterproof shoesBreathable clothingSunscreen (SPF 30+)Sun hatSunglasses
Compare Months
January best
Good 
February best
Good March
Fair April
Fair May
Fair June
Wet July
Wet August
Wet September
Wet October
Wet November
Wet December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | Status | Details |
|---|---|---|---|---|---|---|---|
| January best | 28°C / 26°C | 30°C / 27°C | 14days (81 mm) Wet | 10.7h Excellent | 80% Humid | Good | View Details |
| February best | 27°C / 26°C | 29°C / 27°C | 12days (59 mm) Wet | 10.8h Excellent | 79% Humid | Good | View Details |
| March | 27°C / 26°C | 30°C / 28°C | 13days (44 mm) Wet | 11.3h Excellent | 81% Humid | Fair | View Details |
| April | 28°C / 27°C | 32°C / 29°C | 15days (84 mm) Wet | 11.6h Excellent | 82% Humid | Fair | View Details |
| May | 28°C / 27°C | 32°C / 29°C | 17days (117 mm) Wet | 11.9h Excellent | 82% Humid | Fair | View Details |
| June | 28°C / 27°C | 33°C / 30°C | 22days (175 mm) Wet | 11.4h Excellent | 82% Humid | Wet | View Details |
| July | 29°C / 27°C | 33°C / 30°C | 29days (268 mm) Wet | 10.1h Excellent | 84% Humid | Wet | View Details |
| August | 29°C / 27°C | 34°C / 30°C | 29days (311 mm) Wet | 9.4h Good | 83% Humid | Wet | View Details |
| September | 29°C / 27°C | 34°C / 30°C | 28days (333 mm) Wet | 9.1h Good | 83% Humid | Wet | View Details |
| October | 28°C / 27°C | 33°C / 30°C | 29days (409 mm) Wet | 8.8h Good | 84% Humid | Wet | View Details |
| November | 29°C / 27°C | 32°C / 29°C | 25days (184 mm) Wet | 10.3h Excellent | 83% Humid | Wet | View Details |
| December | 28°C / 27°C | 31°C / 29°C | 20days (110 mm) Wet | 10.7h Excellent | 81% Humid | Wet | View Details |
Frequently Asked Questions
August is typically wet for visiting Guam, with average highs of 29°C (83°F) and around 29 rainy days. Guam in August has hot conditions, with highs reaching 28.5°C (83°F) and afternoons the warmest part of the day. Rain fa
Guam typically sees around 29 rainy days in August with 311 mm (12.2 in) of total rainfall. Pack a waterproof jacket.
With highs of 29°C (83°F) and lows of 27°C (80°F) in August, we recommend: Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). Comfortable walking shoes are essential.
August is not the most favourable month weather-wise in Guam. Consider visiting during months with milder temperatures or less rainfall for a better experience.
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