Guam weather in August

Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average

Guam August weather at a glance

D Challenging 😓

In August, Guam averages 27.7°C, with typical highs of 31°C and lows of 25°C. The historical average is 28 wet days and 81% humidity.

Compared with Seoul in August, it is about the same average temperature as Seoul, with 12 more wet days.

Guam August temperature & humidity

Average27.7°CHigh 31° / low 25°

Humidity81%

Wet days28 days90% of days

Day–night range6°

Guam August rain & wet days

Wet days28 daysHistorical monthly average

Share of wet days90%Not a forecast probability

Pack a light rain jacket, waterproof pouch and quick-dry shoes. Keep an indoor stop available between outdoor activities.

What to wear in Guam in August

Expect intense heat. Pack lightweight quick-dry clothing, sun protection and a refillable bottle. Rain is frequent at roughly 28 days in the month; pack a rain jacket and water-resistant shoes. High humidity makes quick-dry clothing and a spare top especially useful.

DaytimeBreathable short sleeves, hat and sunscreen · average high 31°C
Morning & eveningLight layer for air-conditioned rooms · average low 25°C
FootwearComfortable walking shoes; quick-dry footwear for rainy days.

Useful extras

Quick-dry clothingPortable fanRefillable water bottleRain jacketWater-resistant shoesCompact umbrellaSpare quick-dry top

Choose a destination packing checklist →

Packing essentials

Coupang affiliate links · We earn a commission on purchases. Products are sold on the Korean Coupang store.

Travel compression packing pouches
코멧 여행용 압축 파우치 4종 세트 Travel plug adapter
에너자이저 PD 45W 여행용 멀티 어댑터, 화이트 Portable fan
홈플래닛 컴팩트 BLDC 휴대용 선풍기 GXZ-F78 Compact folding umbrella
솔리앤 초경량 UV차단 3단 자동우산 Inflatable travel neck pillow
마이워니 여행용 에어 목베개

Guam August sunrise & sunset times

2026 August · Local time (Pacific/Guam)

Sunrise on the 15th06:08

Sunset on the 15th18:43

Daylight duration12h 34m

Start, middle and end of the month
Date	Sunrise	Sunset	Daylight
2026-08-01	06:06	18:49	12h 43m
2026-08-15	06:08	18:43	12h 34m
2026-08-31	06:09	18:33	12h 23m

For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.

Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup

Guam travel updates

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Guam travel essentials

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Best months to visit Guam

Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.

J F M A M J J A S O N D

ColdHot

August weather by year

August 202427.4°28 wet days, 85% humidity

August 202528°28 wet days, 77% humidity

Daily weather in 2025

Daily high and low temperatures; blue labels show precipitation

130°25°18mm

232°25°25mm

331°25°9.4mm

431°26°2.5mm

530°23°11mm

633°25°7.5mm

731°25°19mm

833°25°5.8mm

931°26°1.4mm

1030°24°12mm

1131°25°

1232°27°

1332°25°4.2mm

1432°24°9.2mm

1532°24°29mm

1631°26°1.7mm

1732°27°2.2mm

1832°26°3.1mm

1933°27°9.3mm

2033°27°2.1mm

2130°24°23mm

2231°25°20mm

2330°25°12mm

2432°25°24mm

2533°25°5.5mm

2632°26°4.2mm

2732°26°

2832°25°3.3mm

2933°26°7.8mm

3030°25°14mm

3131°26°5.9mm

Frequently asked questions

What is Guam weather like in August?

In August, Guam averages 27.7°C, with typical highs of 31°C and lows of 25°C. The historical average is 28 wet days and 81% humidity. Our weather-comfort rating for this month is challenging.

Does it rain a lot in Guam in August?

There are about 28 wet days in August. Pack a rain jacket and water-resistant shoes.

What should I wear in Guam in August?

What are the best months to visit Guam?

No months meet the A or B threshold in our temperature-and-precipitation score. Compare the monthly values with your planned activities.

Where can I check Guam weather in August in real time?

Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.

What time are sunrise and sunset in Guam in August?

On 2026-08-15, calculated sunrise is 06:08 and sunset is 18:43 in local time (Pacific/Guam). Times vary by date and terrain.

Guam weather by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

More Americas destinations in August

Los Angeles San Francisco Las Vegas Seattle Chicago Boston Washington DC Miami Orlando Hawaii Honolulu Saipan Vancouver Toronto Banff Montreal Mexico City Cancun Lima All destinations →

Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations