French Guiana sits a few degrees north of the equator, on the Atlantic coast of South America. It has no winter, no summer and no hurricane season. What it has instead is a slow alternation between a wet half of the year and a dry half, and a wildlife and cultural calendar that matters far more to your trip than the rainfall does.
This guide covers what each season really feels like, when sea turtles come ashore, when Carnival takes over the streets, and which weeks fill up first. If you already know your dates, go straight to our holiday rentals.
Two seasons, not good weather and bad weather
The climate here is equatorial: hot and humid all year, typically between 26 and 30 °C, day and night, in January as in September. What changes is the rain.
The long dry season runs roughly from July or August to November. Skies are brighter, forest tracks are firmer and boat trips are easier to organise. It is the classic window for hiking and for long days outdoors.
The rainy season runs roughly from December to June, and this is where visitors hesitate, usually without reason. Equatorial rain is not a grey drizzle that ruins a week: it arrives in heavy bursts, often at night or late afternoon, and it stops. Between two showers the sun comes back, rivers are full, waterfalls run and the forest is at its most spectacular. Within that period comes the « petit été de mars », a relative lull around March when drier spells return for a few days at a time. It varies from year to year, but it is a pleasant moment to travel.
Humidity stays high all year. Plan light clothing, something for the rain, and an air-conditioned bedroom.
Season by season, at a glance
| Period | Weather | What it is good for | Booking pressure |
|---|---|---|---|
| December to mid-February | Short rainy season, frequent showers | Start of Carnival, green landscapes | Very high over Christmas and New Year |
| Mid-February to March | The « petit été de mars », drier spells between rains | Peak of Carnival, first turtle nestings | High during Carnival, easier late March |
| April to June | Heaviest rains of the year | Turtle nesting, forest at its greenest | Moderate, apart from school holiday weeks |
| July to November | Long dry season, more sun | Hiking, boat trips, hatchlings early on | High in July and August, calmer from September |
Sea turtles: a season, never a guarantee
French Guiana is one of the world’s major nesting grounds for the leatherback, the largest sea turtle on the planet, and it also receives green turtles and olive ridleys. Females come ashore at night, dig, lay and return to the sea. Weeks later the hatchlings emerge and run for the water.
Nesting runs broadly from March to July, with hatchings continuing to around September. Those are seasons, not dates. A turtle follows no schedule, and no serious guide will promise a sighting on a given night. Some visitors see several females in an evening; others walk the beach twice and see nothing. It is a chance, not a booked activity.
Two areas concentrate the observations. Awala-Yalimapo, in the far north-west, is the historic site, but it is a long drive from Cayenne. Much closer, the beaches of Rémire-Montjoly and Montabo receive nesting turtles in season, so you can stay a few minutes’ walk away.
Go with respect: no white light, no flash, no touching, and follow the local associations that patrol the beaches. Nesting sites are protected.
Carnival: the longest in the world
Guianese Carnival is not a weekend. It opens at Epiphany, on 6 January, and runs until Ash Wednesday — in 2027, 10 February, with Mardi Gras on 9 February. More than a month of parades, music and masked balls, shaping life across the whole territory.
What makes it distinctive is the touloulou. Head to toe, gloves, mask, several layers of fabric: nothing of the wearer is recognisable. At the paré-masqué balls the touloulou chooses a man from the room and invites him to dance, and he cannot refuse. Sunday afternoons belong to the vidés, street processions behind mobile orchestras, each with its own costume traditions. The season closes with the burning of Vaval, the carnival king.
If Carnival is your reason for coming, stay central. You want to walk home, not drive.
School holidays and the weeks that fill up first
Demand in Cayenne and Rémire-Montjoly is driven less by tourists than by the local school calendar, family visits and work travel. For the 2026-2027 school year, the peaks to know are:
- Toussaint: 17 October to 3 November 2026 — mid dry season, one of the busiest windows of the year.
- Christmas: 19 December 2026 to 4 January 2027 — the tightest period of all, with family visits and the start of Carnival overlapping.
- Carnival: 6 to 18 February 2027 — Mardi Gras falls inside this window, so central Cayenne is in very high demand.
- Easter: 25 March to 12 April 2027, the Ascension bridge: 30 April to 10 May 2027, then summer holidays from 3 July 2027 — busy, though less extreme than the three peaks above.
The quieter windows are easy to spot around these dates: late January, the second half of March, most of May and June, and September to mid-October. If your dates are flexible, that is where you will find the best choice.
Which property for which season
- Dry season and outdoor living: Kaz Toti in Montabo, a villa for four with a private pool and terrace, walking distance from Montabo beach and its turtles in season. On Airbnb or Booking.
- Turtle season and beach mornings: Kaz’Alizés in Rémire-Montjoly, an apartment for two in a quiet residence with a pool, a hundred metres from the beach. On Airbnb and Booking.
- Rainy season and nature: Natura Lodge in Roura, a fully private lodge sleeping fourteen on five thousand square metres with a natural stream, near the Comté bridge and the Kaw marshes. On Airbnb or Booking.
- Carnival: L’écrin tropical, a modernised Creole house with a garden in central Cayenne, sleeping six, a short walk from Place des Palmistes, the covered market and Fort Cépérou. On Airbnb or Booking.
The full selection, neighbourhood by neighbourhood, is in our guide to where to stay in French Guiana.
How far ahead should you book?
For Christmas, Carnival and Toussaint, book several months ahead: the best properties go first, and central Cayenne becomes very tight around Mardi Gras. For July and August, a few months of lead time is sensible. For the quieter windows, a few weeks is usually enough.
Booking directly with us means no platform commission, a verified property, personalised check-in and a video tour before you commit. Start from our booking page.
Frequently asked questions
Is the rainy season a bad time to visit French Guiana?
No. Rain comes in short heavy bursts, often at night, and the sun returns between them. Landscapes are greener, waterfalls are at their best, and turtle nesting falls inside this period. Bring a light rain layer and keep your days flexible.
When can I see sea turtles, and am I sure to see them?
Nesting runs broadly from March to July and hatchings continue to around September. A sighting is never guaranteed: it depends on the season, the night and simple luck. Go with a local association and keep your distance.
Do I need to book a year ahead for Carnival?
Not a year, but do not wait. Carnival runs from 6 January to Ash Wednesday on 10 February 2027, with Mardi Gras on 9 February, and the school holidays of 6 to 18 February 2027 concentrate demand in central Cayenne. Several months of lead time is realistic.
Which month is the easiest for finding accommodation?
Outside the school holiday peaks: late January, the second half of March, May and June, and September to mid-October. More choice, and a more relaxed city.
Ready to choose your dates?
Tell us when you want to come and what you want to do — turtles, Carnival, forest, or simply a beach and a pool — and we will tell you honestly what to expect that month and which property fits. We answer in French, English, Spanish and Portuguese.
Message us on WhatsApp, write to contact@amazon-conciergerie-guyane.com, or use our contact page. See everything we handle during your stay on our services page.