Manuel Antonio has two seasons. December through April is dry, sunny, and busy. May through November is green, with rain most afternoons, fewer people, lower rates, and the best whale watching on the coast. There is no bad month, only trade-offs, and the answer to "when should we come" depends on whether you care more about guaranteed sun or about having the place to yourself. Here it is month by month.
The two seasons and the afternoon rain
The dry season runs from about the middle of December to the end of April. Blue skies almost every day, hot sun, the forest going a little brown by March, and big crowds around the holidays. The green season is May to November. It does not rain all day. The usual pattern is a clear morning, clouds building after lunch, a heavy hour of rain around 3 or 4 p.m., then a clean evening. September and October are the wettest, with some days where the rain starts earlier and stays. November is the turn, drying out through the month.
Because of that rhythm, the green season plan is the same one we give families in any month: do the thing in the morning, be under a roof or in a pool by mid afternoon. The park, the boats, and the fishing all run on morning schedules for exactly this reason.
Month by month
| Month | Weather | Crowds | Worth knowing |
|---|---|---|---|
| January | Dry, sunny | Very busy first week, then high | Northern whales building, sailfish peak starts |
| February | Dry, sunny | High | Best all round dry month, whales and billfish both |
| March | Dry, hottest | High, spring break weeks packed | Forest at its driest, easy roads, hot beaches |
| April | Dry, first showers late | Easter week sold out, then quieter | Northern whales tailing off |
| May | Green season begins, afternoon rain | Low | Rates drop, hills turn green, dorado and tuna offshore |
| June | Afternoon rain | Low | Our honest pick for value |
| July | Afternoon rain, often a drier spell mid month | Medium, northern summer holidays | Southern whales arrive |
| August | Afternoon rain | Medium | Whale season in full swing, mothers and calves |
| September | Wet, some full rain days | Lowest of the year | Whale peak, festival in Uvita, park at its emptiest |
| October | Wettest month | Lowest | Whale peak continues, rates bottom out |
| November | Drying through the month | Low, rising late | Whales tail off, marlin pick up |
| December | Dry by mid month | Quiet early, sold out from the 20th | Northern whales begin, town wakes up |
The whales
Marino Ballena National Park at Uvita, about an hour south of Manuel Antonio, is one of the few places where humpbacks from both hemispheres come to breed and calve. That gives this coast two whale seasons instead of one.
The big one is the southern migration: whales that swim up from Antarctic waters and are off Uvita from July to November, with the peak in August, September, and October. That is when mothers and newborn calves rest near the surface and sightings are close to daily. Uvita holds its whale and dolphin festival in September for that reason. The second window is the northern group, arriving from Alaska and California between December and April, with a peak from January to March. Fewer animals, but it lines up with the sunny months. May and June are the gap. Boats leave from Bahía Uvita in the morning, when the sea is flattest, and the trip runs three to four hours. Whale watching boats also leave from Quepos in season, and on a fishing day out of Marina Pez Vela in August you will often see them on the ride out.
The crowded weeks and the quiet ones
Three stretches sell out everything: park tickets, villas, boats, and restaurant tables. Christmas to New Year. Easter week, Semana Santa, when Costa Rica itself goes to the beach and the road from Quepos to the park stops moving. And the North American spring break weeks through March. For all three, book months ahead and expect to pay the top rate. The Christmas period in particular often carries a minimum stay.
The quiet weeks are the first half of December, the second half of January once the holiday crowd leaves, all of May and June, and September through early November. The park itself notes that September and October have the lowest visitation of the year. If you want a photo of Playa Manuel Antonio with nobody in it, that is when.
Why the green season is a good deal
Villa rates drop, and so do most tour and charter prices. You can book a house a few weeks out instead of six months. Park tickets are easy. The forest is at its greenest, the waterfalls run, the rivers are up for rafting, and the wildlife is more active in the cooler, wetter air. And the whales are here. The trade is the afternoon shower, bigger surf on the open beaches, and the occasional full rain day in September or October. If you can live with that, June and August are, for a lot of our guests, the better trip. Fishing follows the same calendar; our guide to Quepos fishing seasons has the offshore side of it.
Packing by season
Dry season, December to April
Light clothes, a hat with a real brim, reef safe sunscreen, and more water than you think. The sun is stronger than it feels in the breeze. One long sleeved layer for boat mornings. Closed shoes for the park trails, sandals for everything else.
Green season, May to November
Everything above, plus a light rain shell (not a heavy jacket, it is too warm), a dry bag or a waterproof cover for the daypack, quick dry clothes because nothing cotton dries overnight, and shoes that can get wet. Insect repellent matters more in these months. A small umbrella is handy in town but not allowed inside the national park.
Whatever month you pick, the park rules and the Tuesday closure do not change; read the national park guide before you fix your dates. More planning guides are on our guides page.
