January is the month most travelers underestimate. Half the planet is shoveling snow and the other half is rubbing sunscreen into shoulders that haven't seen UV in months. This guide is for the second half. We pulled together the destinations where the water is genuinely swimmable in January, not just technically warm enough to dip a toe into. Phuket and the wider Andaman coast are deep into their dry season, Sydney is at peak Aussie summer with beach days that finish in long blue dusks, and Cape Town hits its windswept stride between New Year and February.
The weather, the water, the feel
Expect daytime highs from 28 to 33 C across most of Southeast Asia and the Indian Ocean. The Maldives sits around 29 C with low humidity. Sydney runs hotter, often pushing 35 C inland with cooler coastal breezes at Bondi and Manly. Cape Town gets dry, gusty afternoons and water around 18 to 20 C, which sounds cold until you stand on Camps Bay sand at 30 C and dive in anyway.
Sea temperatures: Phuket 28 C, Maldives 29 C, Sydney 22 C, Costa Rica Pacific side 27 C. The Andaman Sea is mirror calm before sunrise off Kata Noi. The Maldivian atolls have visibility past 25 meters most days. Cape Town's Atlantic side stays bracing, but Muizenberg on the False Bay side warms a few degrees, which is why the surf school crowd ends up there.
Five destinations on the shortlist
Thailand
Phuket
31 C / 88 F
Kata Noi, Freedom Beach, Nai Harn at the south. Skip Patong if you want quiet.
Indian Ocean
Maldives
29 C / 84 F
Baa Atoll for snorkeling, North Male for first-timers, Addu for divers.
Australia
Sydney
27 C / 81 F
Bondi to Coogee walk, Manly ferry day, Palm Beach for the drive.
South Africa
Cape Town
27 C / 81 F
Camps Bay, Llandudno, Clifton 4. Wind drops late afternoon.
Central America
Costa Rica
30 C / 86 F
Santa Teresa and Nosara on Nicoya. Dry season is in full swing.
Insider planning tips
- Book January accommodation in November at the latest. The Maldives and Phuket fill up early because of European holiday flights.
- In Sydney, look at apartments around Bondi and Coogee rather than CBD hotels. You want walking distance to the ocean.
- The Cape Town wind, the southeasterly locals call the Cape Doctor, peaks in the afternoon. Plan beach mornings, mountain afternoons.
- Costa Rica's Pacific side is dry in January but the Caribbean side near Puerto Viejo is the opposite. Pick a coast and commit.
Where to stay
For Phuket, the south end of the island around Nai Harn and Rawai is calmer and feels like a real town. In the Maldives, mid-range guesthouses on Maafushi or Dhigurah cost a fraction of resort prices and have public beaches with bikini areas. Sydney rentals in Bronte, Tamarama, or Manly beat any city hotel. In Cape Town, the Atlantic Seaboard suburbs of Camps Bay and Sea Point are walkable and safe. Costa Rica yoga retreats around Santa Teresa book months out, so look at family-run cabinas in Mal Pais instead.
Final word
January rewards travelers who plan early and stay flexible. The water is warm, the light is long, and most of the northern hemisphere is still scraping windshields.