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Photo by CMSGT Don Sutherland, USAF, Public domain, via Wikimedia Commons.
Guam in December
good · a good time to go
The year in Guam
Tap a month for its page
- JanJGuam in January: good
- FebFGuam in February: sweet spot
- MarMGuam in March: good, busy
- AprAGuam in April: sweet spot
- MayMGuam in May: sweet spot
- JunJGuam in June: good
- JulJGuam in July: avoid
- AugAGuam in August: avoid
- SepSGuam in September: avoid
- OctOGuam in October: avoid
- NovNGuam in November: good
- DecDGuam in December: good
- Sweet spot
- Good
- OK
- Avoid
- Busy
Plan this trip
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Flights from
Flights
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Where to stay
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Luxury
Things to do
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Travel insurance
Check whether your bank card or home insurance already covers this trip.
If the trip needs a visa, the travel agent or visa centre usually sells the cover it asks for.
Mobile data (eSIM)
Your own plan's EU roaming may already cover this.
Renting a pocket Wi-Fi is the other common way to stay connected.
These are sites people in book with. Each opens in a new tab, on the site's own pages.
The numbers
| Daily high | 30°C |
|---|---|
| Nightly low | 25°C |
| Feels like, afternoon | 33°C |
| Rainy days, 1 mm or more | 6 · 113 mm |
| Humidity | 78% |
| Sunshine | 10.3 h/day |
| Daylight | 11.3 h/day |
| Beach and sea | 25 of 31 days dry and 23–35 °C; sea 29 °C, warm good |
| Crowds | 80 / 100, higher is quieter |
Ten-year averages for this calendar month. A rainy day is one with at least 1 mm of rain, as a weather station counts it. The model these figures come from drizzles more than a rain gauge, the more so the warmer the month, so its days count from 2 mm, rising to 5 mm in the hottest.
Weather read at Tumon Bay: ten years of ERA5 and ERA5-Land reanalysis, through Open-Meteo's open data.
How busy it gets
Public holidays in December
- Lady of Camarin Day 8 Dec 2026
- Christmas Day 25 Dec 2026
- Christmas Day (observed) 24 Dec 2027
- New Year's Day (observed) 31 Dec 2027
Holidays crowd a place out and push fares up around them; they count toward the crowd score above.
Guam in pictures
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The National Guard, CC BY 2.0, via Wikimedia Commons
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The National Guard, CC BY 2.0, via Wikimedia Commons
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Anonymous United States Navy photographer, Public domain, via Wikimedia Commons
What to pack
- Summer clothes by day, highs around 30°C.
- Sun protection: about 10 hours of sunshine a day.
- Humidity averages 78%; breathable fabrics dry faster.
Each line is a threshold over the ten-year figures above, not advice from anywhere else.
Before you go
| Currency | United states dollar |
|---|---|
| Languages | English, Chamorro |
| Plugs | Type A and B, 110 V |
| Driving | On the right |
| Calling code | +1671 |
| Travel advice | No advice against travel — UK Foreign Office, updated 2026-08-18 Exercise normal security precautions — Global Affairs Canada, updated 2026-09-24 |
| Health | UK Foreign Office health advice |
Facts from Wikidata (CC0), the UK Foreign Office (Open Government Licence) and the World Bank, refreshed 2026-10-08. The advisory is written for British travellers; entry rules depend on your passport.Travel advice for American readers is the US State Department's (public domain), and for Canadian readers Global Affairs Canada's (Open Government Licence - Canada), each in its own words and written for its own citizens; entry rules depend on your passport.
On arrival in Guam: the apps, paying, getting around, tipping and the emergency numbers.
December elsewhere
In December from
The other months at Guam
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