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Micronesia is a group of more than 600 beautiful, tropical, volcanic and forested islands. On the islands you will find a lot of untouched nature with waterfalls and mountains.
Guam Weather in December
December in Guam averages 29°C (84°F) during the day and 27°C (81°F) at night. Quite a bit of rainfall is typical this month, with around 105 mm (4.1 in) on average. An umbrella is a good idea.
Rainfall in Guam in December
Climate statistics over the past 30 years suggest around 23 days of rain, with 105 mm (4.1 in) average for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Guam in December
Guam in December gets highs of 29°C (84°F) during the day and drops to 27°C (81°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights remain warm at around 27°C (81°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.
Sunshine in Guam in December
The area enjoys a balanced 143 hours of sunlight, ensuring it's neither too overcast nor too sunny.If you prefer enjoying temperate temperatures and rain-free days, January, February, March, April and May typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Guam Temperature in December
Min Temperature
27°C (81°F)
Max Temperature
29°C (84°F)
Chance of Rain
76%
Precipitation
105 mm (4.1 in)
Rainy days
23 days
Sunshine
143 hours
Percentage Sunshine
Guam Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Guam - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Guam typically stay consistent throughout December, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather records for Guam in December
Browse day-by-day weather records for Guam spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Guam historical weather extremes in December
The extremes listed below come from historical weather data collected in Guam from 1976 through 2025.
- The warmest day in December was on December 10, 1979, with a maximum of 35°C (95°F).
- The lowest daytime temperature in December was 25°C (77°F), recorded on December 17, 1997.
- The coldest night in December in Guam was on December 8, 1980, with a minimum of 21°C (70°F).
Best Places in Micronesia in December
Find out more about the weather in Micronesia and which places have the best travel conditions in this month. See all of Micronesia in December →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Guam in December
Warm temperatures in December make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Guam in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Guam 3-Day Forecast
More climate data for Guam
See the full Guam climate overview or explore weather in Micronesia.
Popular in December
Where to go in December - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Go to Micronesia
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