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Weather & climate
Weather in Guam
Guam
28°
Thunderstorm
Thu
28°
28°
Fri
27°
28°
Sat
27°
28°
Sun
26°
28°
Mon
27°
27°
Tue
27°
28°
Wed
27°
29°
SPF level in Guam
Recommended: SPF 50+ (extreme)
Spring
SPF 50+
Summer
SPF 50+ (extreme)
Autumn
SPF 50+
Winter
SPF 50+
Suncream is often more expensive in tourist zones. Pack your preferred SPF from the UK, especially for beach holidays. Always carry travel-size (100ml max) for hand luggage.
Before you go
Entry requirements for Guam
What British travellers need to know
You must have a valid Electronic System for Travel Authorisation (ESTA) or a US visa to enter the United States.
Your passport must be valid for the length of your planned stay in the US.
If transiting through another country to reach the US, check that country's requirements as many require at least six months' passport validity.
You are not eligible for an ESTA if you have been arrested, have a criminal record, have been refused admission or deported from the US, or have previously overstayed under an ESTA.
All travellers aged 17 and under must have a valid visa or ESTA and be able to provide evidence about the purpose, location, and length of their visit if asked.
Good to know:
Anyone aged 17 and under travelling alone, with one parent, or without a parent or guardian should carry a notarised letter of consent, preferably in English.
You must declare any goods that may be prohibited or subject to tax or duty upon entry.
Safety in Guam
Tips when travelling
Guam is tourist-friendly but has some key cultural and legal rules:
Always carry your passport with you, as it is required to show you have permission to be in the US.
Do not leave passports in rental cars, especially in the boot, as gangs may target tourist vehicles.
Avoid walking through quieter areas alone, particularly at night, due to the risk of violent crime.
Be aware that the legal age for buying and drinking alcohol is 21 across the entire country.
Illegal drugs, including cannabis, carry severe penalties like long jail sentences and heavy fines, even for possession.
Bonus tips:
When renting a car, check the hire company's specific requirements, which may include needing an international driving permit and a higher minimum age.
In popular tourist areas, be cautious of petrol stations that do not display fuel prices, as they often charge significantly more.
More information
Driving in Guam
A valid UK driving license is accepted for a short period. An international driving permit (IDP) is recommended.
Side of road
right
Motorway speed limit
88 km/h (55 mph)
Urban speed limit
40 km/h (25 mph)
Alcohol limit
0.08%
Remember: Guam drives on the right. Take extra care at junctions if you normally drive on the left.
Health in Guam
As a British tourist, ensure you have comprehensive travel insurance that covers medical expenses, including emergency treatment and repatriation. While the GHIC/EHIC card is useful in Europe, it is not applicable in Guam. Check your policy details carefully.
Consult your doctor or a travel clinic well in advance of your trip to discuss necessary vaccinations and health precautions. Dengue fever can occur. Protect yourself from mosquito bites by using insect repellent, wearing long sleeves and trousers, and staying in accommodations with air conditioning or mosquito nets. Tap water is generally considered safe to drink, but bottled water is readily available and may be preferred. Food safety standards are generally high.
Cards & payments
Credit and debit cards are widely accepted in Guam, especially in hotels, restaurants, and larger establishments popular with tourists. However, smaller businesses may prefer cash.
Visa
High
Mastercard
High
American Express
Medium
Lost card? Call Visa: +14105819994
Tipping in Guam
Tipping is customary in Guam for various service industries. While not mandatory, it is a common way to show appreciation for good service.
Restaurant
15-20% of the bill for good service
Bar/Café
$1-2 per drink or 15-20% of the bill
Taxi
10-15% of the fare for good service
Hotel Porter
$1-2 per bag
Hotel Housekeeper
$1-2 per night of stay
Tour Guide
10-15% of the tour cost for a good tour
Mobile & roaming
As the UK is no longer part of the EU, EU roaming agreements no longer apply. Check with your mobile provider about international roaming charges for Guam. Roaming charges can be high, so consider purchasing a local SIM card if you plan to use mobile data extensively.
Local SIM
10 GB for 30 USD (~£24)
Network coverage
4G LTE, 5G
Electrical in Guam
Voltage
110V / 60Hz
Plug types
Type A, Type B
WiFi & internet
WiFi is available in many hotels, restaurants, and cafes, especially in tourist areas. Some public areas may also offer free WiFi.
Average speed
25 Mbps
WiFi is widely available in Guam, but the speed can vary. Mobile data is a viable alternative, especially with a local SIM card.
Emergency numbers
Universal emergency
911
Save 911 in your phone before travelling.
Calling Guam
Country code
+1
To call the Guam Visitors Bureau, you would dial 00 1 671 646-5278 from the UK.
The country code for Guam is 1. The area code for Guam is 671. When calling Guam from abroad, dial the exit code of your country, followed by Guam's country code (1), then the area code (671), and finally the local number.
UK Embassy
British Embassy Washington (though there is no physical British embassy or consulate in Guam)
3100 Massachusetts Avenue, NW Washington, DC 20008
Phone
Website
Frequently asked questions
While we strive to provide accurate and up-to-date information, AtoBeach cannot be held responsible for any inaccuracies. We recommend verifying details with official sources before travelling.