Costa Rica’s two seasons, explained
Costa Rica doesn’t have four seasons — it has two: the dry season (roughly December through April) and the green season (May through November). Neither one is “wrong.” They simply offer different versions of the country, and the best month for your trip depends on what you want from it.
One thing stays constant year-round in the northern lowlands of San Carlos: the thermal waters. Volcanic hot springs don’t follow the weather forecast, which is why a thermal spa escape works beautifully in any month.
Month-by-month breakdown
December to April — the dry season
- December & January: The most festive months. Skies clear up, everything is still lush from the rains, and the holiday atmosphere is contagious. Book early — this is peak demand.
- February & March: The most reliable sunshine of the year. Ideal for combining volcano hikes, waterfalls, and long evenings soaking in the hot springs.
- April: Warm and dry, with Easter week (Semana Santa) bringing Costa Rican families to the beaches and hot springs. A lively, very local time to visit.
May to November — the green season
- May & June: The rainforest turns electric green. Mornings are usually sunny, with afternoon showers that make an evening thermal soak feel even better. Prices drop and crowds thin out.
- July: The “veranillo” — a mini dry spell in the middle of the green season. A local secret and a great-value window.
- August & September: The quietest months. If you want thermal pools nearly to yourself and don’t mind rain in the afternoons, this is your moment.
- October: The rainiest month on the Pacific side — but the Caribbean side is at its driest. In San Carlos, expect dramatic skies and full waterfalls.
- November: Transition month. The rains taper off, the landscape is at maximum green, and high-season prices haven’t kicked in yet.
Best month by travel style
- Honeymooners: February or March for guaranteed sun — or September for total privacy. See our Costa Rica honeymoon guide.
- Families: June, July, or December, matched to school holidays. The thermal pools are a hit with kids year-round.
- Wellness travelers: Green season. Rain on the rainforest canopy while you soak in a hot mineral pool is the whole point.
- Budget travelers: May, June, or September–November for the best rates.
Why the thermal springs make weather (almost) irrelevant
Here’s the honest secret about the Arenal–San Carlos region: the main attractions work in any weather. The hot springs at El Tucano Resort & Thermal Spa are fed by naturally heated volcanic rivers that flow through the property — rain or shine, the water arrives hot and mineral-rich. Many guests say their most memorable soak was during a warm afternoon rain shower, surrounded by rainforest.
Plan your trip
Whichever month you choose, the formula is the same: rainforest, thermal water, and time to slow down. Check live availability and rates on our booking engine, or explore our seven room types to find your fit.