Does Costa Rica get cold in winter in 2026?

Central Valley floors around San José, Escazú, and Atenas stay mild by day, then drop enough at night that many homes want a light sweater or blanket, especially in clearer dry months: Living in San José, Living in Escazú, and Living in Atenas. That night relief is a feature of tierra templada, not a failed tropical promise: Altitude and climate.

Monteverde, Santa Elena, San Gerardo de Dota, and higher volcano slopes feel colder still. Cloud cover and wind make mid-teens Celsius evenings feel sharp when you arrive from beach heat. Pack layers for cloud-forest weekends even if your Escazú lease feels springlike. Frost and near-freezing nights belong mainly to the highest ground, such as Chirripó approaches, not to Guanacaste beaches: Living in Tamarindo.

Many Costa Rican homes are built to shed heat and humidity, not to hold winter warmth. Tile floors, open vents, and no built-in heating can make a valley night feel cooler than the outdoor number suggests. Before renting a hillside Atenas or Monteverde unit, check hot-water capacity, window seals, damp smell in green season, and whether a small space heater is practical and electrically safe.

Pacific dry months (verano) bring clearer nights and stronger late-season heat on the coast, not highland cold: Dry season and Summer heat. Green-season invierno brings afternoon rain and mud more than jackets in San José: Rain. If you want cooler sleep without Monteverde mist, valley altitude usually beats air-conditioned beach nights: Best climate.