Guam weather in December

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

Guam December weather at a glance

D Challenging 😓

In December, Guam averages 28.1°C, with typical highs of 31.2°C and lows of 25.9°C. The historical average is 18 wet days and 73% humidity.

Compared with Seoul in December, it is 29°C warmer than Seoul, with 13 more wet days.

Guam December temperature & humidity

Average28.1°CHigh 31.2° / low 25.9°

Humidity73%

Wet days18 days56% of days

Day–night range5.3°

Guam December rain & wet days

Wet days18 daysHistorical monthly average

Share of wet days56%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 December

Expect intense heat. Pack lightweight quick-dry clothing, sun protection and a refillable bottle. Rain is frequent at roughly 18 days in the month; pack a rain jacket and water-resistant shoes.

DaytimeBreathable short sleeves, hat and sunscreen · average high 31.2°C
Morning & eveningLight layer for air-conditioned rooms · average low 25.9°C
FootwearComfortable walking shoes; quick-dry footwear for rainy days.

Useful extras

Quick-dry clothingPortable fanRefillable water bottleRain jacketWater-resistant shoesCompact umbrella

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 December sunrise & sunset times

2026 December · Local time (Pacific/Guam)

Sunrise on the 15th06:35

Sunset on the 15th17:56

Daylight duration11h 21m

Start, middle and end of the month
Date	Sunrise	Sunset	Daylight
2026-12-01	06:28	17:52	11h 24m
2026-12-15	06:35	17:56	11h 21m
2026-12-31	06:43	18:04	11h 21m

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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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

December weather by year

December 202428.3°21 wet days, 74% humidity

December 202528°14 wet days, 73% humidity

Daily weather in 2025

Daily high and low temperatures; blue labels show precipitation

130°25°13mm

231°27°

331°27°

432°27°

530°26°5.7mm

631°27°1.8mm

733°27°

831°26°4.1mm

931°26°

1031°26°

1132°26°

1232°26°

1332°27°

1429°26°5.7mm

1532°25°4.4mm

1632°26°

1731°25°2.6mm

1832°26°

1932°26°

2031°25°8.9mm

2131°26°

2228°25°4.9mm

2328°24°6.9mm

2429°24°3.9mm

2531°26°

2631°26°2.4mm

2731°25°1.7mm

2832°25°

2931°26°

3032°25°

3130°26°3mm

Frequently asked questions

What is Guam weather like in December?

In December, Guam averages 28.1°C, with typical highs of 31.2°C and lows of 25.9°C. The historical average is 18 wet days and 73% humidity. Our weather-comfort rating for this month is challenging.

Does it rain a lot in Guam in December?

There are about 18 wet days in December. Pack a rain jacket and water-resistant shoes.

What should I wear in Guam in December?

Expect intense heat. Pack lightweight quick-dry clothing, sun protection and a refillable bottle. Rain is frequent at roughly 18 days in the month; pack a rain jacket and water-resistant shoes.

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 December 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 December?

On 2026-12-15, calculated sunrise is 06:35 and sunset is 17:56 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 December

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