December is the peak of the southern hemisphere summer and the most reliable warm-water month for tropical destinations close to the equator. The Maldives is at its absolute clearest. Mauritius hits its summer. Thailand's Andaman coast is bone dry. Australia is at full summer. South Africa goes wild. Costa Rica's Pacific dry season is in full swing. The downside is peak pricing around Christmas and New Year. The upside is the experience pays it back.
Why December works
Maldives 30 C, water 29 C, visibility 30 meters. Mauritius 30 C, water 28 C. Sydney 26 C with hot waves. Cape Town 27 C and breezy. Costa Rica Pacific 30 C and dry. Phuket 31 C and dry. Bali at the cusp of its rainy season but still mostly sunny early in the month.
Maldivian house reef snorkeling is unbeatable in December. Mauritian lagoons are at peak warmth at Le Morne, Trou aux Biches, and Belle Mare. Phuket and Krabi waters glass over by sunrise. Costa Rica's Nicoya Peninsula surf at Santa Teresa, Nosara, and Mal Pais is consistent and clean. Australia's east coast is at full beach mode from Byron to Bondi.
The five destinations we keep returning to
Maldives, Indian Ocean
Best snorkeling visibility of the year. Daytime temperatures average around 30 C / 86 F. The water sits warm enough that the first swim of the morning feels like an unhurried decision rather than a brave one. Locals fall into a daily rhythm around the sun: early walk, late breakfast, long swim, slower lunch, quiet hour, second swim, sunset somewhere with a view.
The reason Maldives works in December comes down to geography. The prevailing wind pattern keeps humidity in check, the sea has had enough time to either warm up or stay warm, and the local tourism rhythm is either at its considered peak or in a friendly shoulder. Either way, restaurants are open, transport is running, and accommodation has enough choice that you do not need to compromise.
Mauritius, Indian Ocean
Le Morne, Tamarin, Belle Mare. Dolphins off La Gaulette. Daytime temperatures average around 30 C / 86 F. The water sits warm enough that the first swim of the morning feels like an unhurried decision rather than a brave one. Locals fall into a daily rhythm around the sun: early walk, late breakfast, long swim, slower lunch, quiet hour, second swim, sunset somewhere with a view.
The reason Mauritius works in December comes down to geography. The prevailing wind pattern keeps humidity in check, the sea has had enough time to either warm up or stay warm, and the local tourism rhythm is either at its considered peak or in a friendly shoulder. Either way, restaurants are open, transport is running, and accommodation has enough choice that you do not need to compromise.
Thailand, Andaman coast
Phi Phi, Phuket, Krabi. Dry and reliable. Daytime temperatures average around 31 C / 88 F. The water sits warm enough that the first swim of the morning feels like an unhurried decision rather than a brave one. Locals fall into a daily rhythm around the sun: early walk, late breakfast, long swim, slower lunch, quiet hour, second swim, sunset somewhere with a view.
The reason Thailand works in December comes down to geography. The prevailing wind pattern keeps humidity in check, the sea has had enough time to either warm up or stay warm, and the local tourism rhythm is either at its considered peak or in a friendly shoulder. Either way, restaurants are open, transport is running, and accommodation has enough choice that you do not need to compromise.
Costa Rica, Pacific coast
Santa Teresa, Nosara, Manuel Antonio. Daytime temperatures average around 30 C / 86 F. The water sits warm enough that the first swim of the morning feels like an unhurried decision rather than a brave one. Locals fall into a daily rhythm around the sun: early walk, late breakfast, long swim, slower lunch, quiet hour, second swim, sunset somewhere with a view.
The reason Costa Rica works in December comes down to geography. The prevailing wind pattern keeps humidity in check, the sea has had enough time to either warm up or stay warm, and the local tourism rhythm is either at its considered peak or in a friendly shoulder. Either way, restaurants are open, transport is running, and accommodation has enough choice that you do not need to compromise.
Australia, East coast
Sydney harbor beaches, Byron Bay, Whitsundays. Daytime temperatures average around 27 C / 81 F. The water sits warm enough that the first swim of the morning feels like an unhurried decision rather than a brave one. Locals fall into a daily rhythm around the sun: early walk, late breakfast, long swim, slower lunch, quiet hour, second swim, sunset somewhere with a view.
The reason Australia works in December comes down to geography. The prevailing wind pattern keeps humidity in check, the sea has had enough time to either warm up or stay warm, and the local tourism rhythm is either at its considered peak or in a friendly shoulder. Either way, restaurants are open, transport is running, and accommodation has enough choice that you do not need to compromise.
How to plan it
- Christmas week prices spike 200 to 300 percent in tropical destinations. Travel the first half of December or the second half of January for value.
- Maldives transfers by seaplane only operate in daylight. Late arrivals get an overnight in Male.
- Sydney New Year fireworks accommodation books a year out.
- Thailand's Krabi is busier than Phuket the week between Christmas and New Year because of cheaper flights.
Where to stay
Maldives mid-range resorts on Maafushi, Dhigurah, and Thoddoo are realistic. Mauritian self-catering apartments in Tamarin and Pereybere beat resort buffet life. Thai villas in Rawai, Naiyang, and Bangtao are excellent value if booked early. Costa Rican surf hostels and small lodges in Santa Teresa and Nosara are best booked direct. Australian east coast holiday houses in the hinterland behind Byron are quieter than the beach itself.
Final thoughts
December at warm latitudes is the original endless summer experience. Pay attention to timing and it pays back.
If you take only one piece of advice from this guide, take this. The best December trip is not the one that ticks the most destinations, it is the one that gives the sun and the water enough time to do what they are good at. Stay longer in fewer places. Eat where the menu is short. Walk barefoot when you can. The chase for summer is rarely about distance, it is about timing, and December is one of those months that pays the patient traveler back in full.
