September 2026 is the wettest stretch of the Manuel Antonio year and, for wildlife, one of the most productive — the animals are still on the trails, they are just on a tighter schedule. This is our season report for the month: which species the park is producing, the hour and the trail where each one turns up, the measured rainfall with its source named, the five Tuesdays the park was closed, and what a Swarovski ATX spotting scope changes when the canopy is wet. Nothing here is a promise that you will see a particular animal — this is wild nature, and we would rather tell you the odds than sell you a certainty.

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What wildlife is Manuel Antonio National Park producing in September 2026?

The animals you are most likely to see on a September morning in Manuel Antonio are white-faced capuchin monkeys, the endemic Central American squirrel monkey, mantled howler monkeys, the brown-throated three-toed sloth, green iguanas, white-nosed coatis, northern raccoons, halloween crabs, and yellow-throated toucans or collared aracaris overhead. Scarlet macaws and the eyelash viper stay what they always are: luck. The variable that decides your morning is not the month — it is the hour. Mammals and birds feed early, rest through the heat, and become active again after the park has already closed at 3:00 p.m.

What September adds to that baseline is water. Wet leaf litter means the ground-level animals — coatis, raccoons, halloween crabs, the two-toed sloth coming down to move — are working a longer window than they do in the dry season, because the heat builds later. What September takes away is the light: at 5.1 hours of sunshine a day, the canopy is darker, and a sloth that would be a silhouette at 300 metres in February is a grey shape you need optics to resolve.

September 2026 by species, hour and trail

This table is a season report, not a log of counted animals: it says where and when each species is most likely on a September morning, using only what we have already published about the park’s trails. We do not publish sighting counts nobody measured.

Species Best hour Where on the trails
Central American squirrel monkey (endemic) 7:00–9:00 a.m. Sendero Principal, mid-canopy, moving as a troop
White-faced capuchin 7:00 a.m.–noon Playa Manuel Antonio and the Sendero Principal near the beaches
Mantled howler monkey Dawn, before the gate opens; heard more than seen High canopy over the Sendero Principal and Sendero Punta Catedral
Brown-throated three-toed sloth Any hour — it barely moves Sendero El Perezoso, the raised boardwalk
Hoffmann’s two-toed sloth Late afternoon and night; hardest of the two by day Sendero El Perezoso and the dense tangles off the Sendero Principal
White-nosed coati 7:00–10:00 a.m., earlier when the litter is wet Ground level along the Sendero Principal and around the beach entrances
Northern raccoon Early morning and again near closing Playa Espadilla Sur, edges of the picnic areas
Green iguana 9:00 a.m.–1:00 p.m., needs sun on its back Open branches over Playa Espadilla Sur and Playa Manuel Antonio
Common basilisk Mid-morning Stream edges and wet ground off the Sendero Principal
Yellow-throated toucan 6:30–9:00 a.m. Canopy along the Sendero Principal, calling before it is visible
Collared aracari Early morning, in small groups Fruiting trees near the Sendero El Perezoso
Scarlet macaw Early morning or late afternoon, in flight Over Playa Espadilla Sur and the coastline — luck, not a plan
Eyelash viper Any hour, if a guide finds it Coiled low on leaves off the Sendero El Perezoso — the definition of luck
Halloween crab Early morning, strongest after rain Wet ground between the Sendero Principal and the mangrove edge

Manuel Antonio weather in September 2026, and what the rain does to a morning walk

September averages 834.8 mm of rain over 21.8 rainy days, with a daytime high of 27.5 °C (81.5 °F), nights near 23.2 °C, and 5.1 hours of sunshine a day. Source: weather-and-climate.com, Manuel Antonio National Park page, data from the Quepos station 7 km from the park — Foreca / Copernicus C3S climate averages 1991–2020, read on 25 September 2026. Treat the rainfall figure as an order of magnitude and the rainy-day count as the useful number: 21.8 rainy days means most days have rain on them, not that it rains all day.

What that means in practice is the reason we start at 7:00 a.m. In September the rain arrives in the afternoon far more often than at dawn. A 7:00 a.m. start puts you on the Sendero Principal in the driest, coolest, most active part of a green-season day and back out before the sky closes. A tour booked for 1:00 p.m. in September is booking the weather you are trying to avoid.

The five Tuesdays the park was closed in September 2026

Manuel Antonio National Park is closed every Tuesday, which in September 2026 meant the 1st, 8th, 15th, 22nd and 29th. Those five dates are not tour days inside the park. If your date falls on one of them, the honest answer is not “come anyway” — it is that the night tour runs on Tuesdays because it enters a private reserve and does not depend on the park being open, and the mangrove boat tour runs too.

What the Swarovski ATX spotting scope changes on a September morning

The scope is what turns a distant grey lump into an animal with a face, and in September that matters more than in the dry season, because the light is worse. A brown-throated three-toed sloth 30 metres up on the Sendero El Perezoso is, to the naked eye, a shape. Through the Swarovski ATX at 30–70×, it is an animal whose eyes, claws and breathing you can see — and if it is carrying a baby, you can see the baby. The same applies to a yellow-throated toucan against a grey sky: without optics it is a silhouette, with them it is the bill colour that names the species.

It also changes what a group gets out of a single sighting. One person with binoculars sees the sloth; a group queuing at a tripod-mounted scope all see the same sloth, which is the difference between “we were told there was a sloth” and “we saw the sloth”. Every Wakoo tour carries one.

The three monkeys in September: where each one turns up

All three Manuel Antonio monkey species are active in September, and they separate by height and by hour. The Central American squirrel monkey — the endemic, the one people come for — travels in troops through the mid-canopy and is a 7:00–9:00 a.m. animal on the Sendero Principal; once the heat builds, the troop is gone. The white-faced capuchin is the opportunist and the one you are most likely to meet at eye level near Playa Manuel Antonio, which is exactly why the park asks you not to feed them and to keep bags closed. The mantled howler is the one you hear at dawn from outside the park and see least: it sits high and still in the canopy over the Sendero Principal and the Sendero Punta Catedral.

Sloths in September: the wet-season advantage nobody mentions

Wet season does not hurt sloth sightings, and the reason is simple: a sloth does not move to avoid rain. The brown-throated three-toed sloth is the one you realistically see by day, and the Sendero El Perezoso — a raised boardwalk — is the trail built around that fact. Hoffmann’s two-toed sloth is nocturnal enough that daytime sightings are a bonus, not a plan. What September does hurt is your ability to resolve what your guide has found, which loops straight back to the scope.

Reptiles, crabs and the ground-level animals of the green season

September is the month the ground-level animals are easiest and the sun-dependent reptiles are hardest. Green iguanas need sun on their backs to be out on open branches over Playa Espadilla Sur, and on a 5.1-hour-of-sunshine day there is less of that window. The common basilisk goes the other way: wet stream edges off the Sendero Principal are its habitat, and it is a mid-morning animal in September. Halloween crabs — the animal nobody expects to remember and everybody photographs — are at their best on wet ground right after rain, which in September is most mornings.

What a September wildlife tour costs

Four options, and the price difference is group size and pickup, not which animals exist. The group tour is $30 per person. The Premium tour is $65 per person and is shared, not private, with transport covering the Quepos–Manuel Antonio corridor. The Classic Private tour is $69 and the VIP Private tour is $100. The park entrance fee is separate and is paid to SINAC. The full breakdown of what each option includes is on the Manuel Antonio National Park guided tour page.

Frequently asked questions about Manuel Antonio wildlife in September 2026

Is September a bad month to see wildlife in Manuel Antonio?

No — September is one of the wettest months but the animals do not leave. What changes is the light and the timing: at 5.1 hours of sunshine a day the canopy is darker, so a spotting scope matters more, and the rain concentrates in the afternoon, so a 7:00 a.m. start matters more.

What time should a September wildlife tour start?

7:00 a.m. Mammals and birds feed early and rest through the heat, the park closes at 3:00 p.m., and in September the rain arrives in the afternoon far more often than at dawn. The first two hours after the gate opens are the whole tour.

Which days was the park closed in September 2026?

Tuesday 1, 8, 15, 22 and 29 September 2026. Manuel Antonio National Park closes every Tuesday.

Can you guarantee I will see a sloth or a squirrel monkey?

No, and anyone who does is selling you something. The brown-throated three-toed sloth on the Sendero El Perezoso and the squirrel monkey troops on the Sendero Principal are the two most likely sightings of a September morning, but this is wild nature.

Does the spotting scope really make a difference?

Yes, and most in the wet season. A sloth 30 metres up is a grey shape to the naked eye and an animal with a face through a Swarovski ATX at 30–70×. It also means a whole group sees the same animal instead of being told it is there.

How much does a September wildlife tour cost?

From $30 per person for the group tour. Premium is $65 per person and is shared, Classic Private is $69 and VIP Private is $100. The SINAC park entrance fee is paid separately.

Next months: read the October 2026 sighting report, the December 2026 preview, or the full Manuel Antonio wildlife sighting reports index.