Cayenne in September
September weather, activities, events & insider tips
September Weather in Cayenne
Is September Right for You?
Advantages
- Perfect dry season weather with only 64mm (2.5 inches) of rain across 10 days - most rain falls in short afternoon bursts that clear quickly
- Peak wildlife viewing in the Amazon as animals concentrate around water sources during the dry season, making spotting easier on river tours and jungle walks
- Optimal conditions for space center visits at Centre Spatial Guyanais - clear skies provide excellent rocket launch viewing opportunities (Ariane 6 launches scheduled)
- Sea turtle nesting season peaks on nearby beaches, particularly at Plage des Hattes, with guided night tours available most evenings
Considerations
- High tourist season means accommodation prices increase 30-40% compared to wet season months, and advance booking essential
- Afternoon humidity reaches 85% making midday outdoor activities uncomfortable - most tours adjust schedules accordingly
- Strong trade winds can make boat trips to offshore islands choppy, with departures sometimes cancelled on windier days
Best Activities in September
Amazon River Wildlife Tours
September's dry conditions concentrate wildlife around remaining water sources, making this the premier month for spotting caimans, river dolphins, and tropical birds. Water levels are perfect for navigating smaller tributaries while maintaining comfort. Tours typically run 6am-10am and 4pm-7pm to avoid peak heat and humidity.
Centre Spatial Guyanais Space Center Tours
September offers excellent weather for space center visits with minimal rain interference. Clear skies provide optimal viewing for any scheduled Ariane 6 launches. The dry season also means better road access to viewing areas and comfortable outdoor waiting periods.
Sea Turtle Watching at Plage des Hattes
Peak leatherback turtle nesting season runs through September. Night tours (8pm-2am) offer 85% success rates for turtle sightings. Dry weather ensures reliable access to nesting beaches and comfortable overnight experiences. Best viewing occurs during new moon phases.
Marché de Cayenne Food Tours
September brings peak availability of regional fruits and fresh river fish to Cayenne's this destination. Early morning tours (7am-10am) avoid afternoon heat while experiencing the market at its most busy. Dry weather means comfortable walking and outdoor food sampling.
Îles du Salut (Devil's Island) Day Trips
September's consistent weather provides reliable boat service to the infamous prison islands. Calm morning seas (8am-11am departures) ensure comfortable 1-hour crossings. Clear skies offer excellent photography conditions of the historic prison ruins and coastal scenery.
Cacao Hmong Village Cultural Tours
September's dry roads provide excellent access to this unique Hmong community 78km (48 miles) from Cayenne. Harvest season brings special cultural activities and fresh produce markets. Comfortable weather allows for walking tours through traditional gardens and craft workshops.
September Events & Festivals
Ariane 6 Launch Window
September 2025 includes scheduled Ariane 6 rocket launches from Centre Spatial Guyanais. Public viewing areas offer spectacular nighttime launches visible across French Guiana. Launch viewing parties occur at designated beaches with food vendors and live commentary.
Fête de la Gastronomie
French Guiana celebrates national gastronomy week with special menus featuring Creole-French fusion cuisine. Local restaurants offer traditional dishes with modern interpretations, and cooking demonstrations occur at Marché de Cayenne.