Things to Do in São Tomé in May
May weather, activities, events & insider tips
May Weather in São Tomé
Is May Right for You?
Advantages
- Gravana season brings calmer seas and exceptional visibility for diving and snorkeling - you'll get 20-30 m (65-100 ft) underwater visibility around Ilhéu das Rolas and the southern coast, compared to 10-15 m (33-50 ft) during the rainy months. Water temperatures hover around 26-27°C (79-81°F), which is comfortable without a wetsuit.
- May sits right at the tail end of the dry season before the big rains return in October, meaning you get mostly sunny mornings perfect for hiking Pico Cão Grande or exploring the roças. The 10 rainy days listed are typically brief afternoon showers that last 15-20 minutes, not all-day washouts - locals call this 'chocolate rain' because it often comes with dramatic clouds over the volcanic peaks.
- Tourist numbers drop significantly after Easter week, so you'll have beaches like Praia Jalé and Praia Banana practically to yourself. Accommodations typically run 20-30% cheaper than July-August peak season, and you can book quality places just 2-3 weeks out instead of the 2-3 months needed for high season.
- Sea turtle nesting season is in full swing - four species nest here between November and May, with hawksbill and green turtles particularly active in May. Beach patrols at Praia Jalé and along the southern coast offer guided night walks where you'll actually see nesting females, not just tracks from the previous night.
Considerations
- The 70% humidity combined with 28°C+ (82°F+) temperatures creates that sticky tropical feeling where your clothes never quite dry and you'll be showering twice daily. If you're sensitive to heat or have respiratory issues, this can be genuinely uncomfortable - there's no escaping it since air conditioning is rare outside higher-end lodges.
- May is transition season, which means weather can be genuinely unpredictable day-to-day. You might get three gorgeous sunny days followed by two overcast ones with intermittent drizzle. This makes planning multi-day hiking trips or boat excursions a bit of a gamble - you'll need flexibility in your itinerary.
- Some restaurants and smaller guesthouses in São João dos Angolares and other villages reduce hours or close temporarily during this shoulder period, particularly mid-week. You won't go hungry, but your dining options shrink and you might find that charming place you read about isn't actually open on Tuesday.
Best Activities in May
Southern coast diving and snorkeling expeditions
May offers the year's best underwater visibility thanks to calmer gravana season seas. The volcanic underwater topography around Ilhéu das Rolas creates dramatic drop-offs and channels where you'll encounter barracuda, moray eels, and occasional manta rays. Water temperature sits at a comfortable 26-27°C (79-81°F), warm enough to skip the wetsuit for snorkeling. Morning departures work best - seas tend to pick up slightly in afternoons, and you'll avoid the brief rain showers that typically roll through between 2-4pm.
Pico Cão Grande and interior rainforest hikes
The iconic volcanic plug rising 663 m (2,175 ft) from the jungle floor is best tackled in May's relatively dry conditions. Trails are muddy year-round given the rainforest environment, but May means you can actually complete the full approach hike to the base without streams becoming impassable. Start at 6am to avoid afternoon heat and potential showers - you'll need 6-7 hours round trip from the trailhead. The forest canopy provides shade, but humidity stays high throughout. Worth noting that the actual rock climb requires technical gear and permits, but the jungle trek to view it up close is spectacular.
Roça plantation heritage tours
May's weather makes exploring the old colonial coffee and cocoa plantations more comfortable than the hotter months ahead. Roça São João, Roça Sundy, and Roça Agostinho Neto offer different perspectives on the plantation era - some restored as hotels, others atmospheric ruins being reclaimed by jungle. The cooler mornings are ideal for wandering the old processing buildings and workers' quarters. Several roças still produce chocolate, and you can watch the fermentation and drying process that happens year-round. The combination of architecture, history, and agricultural heritage gives you context for understanding modern São Tomé.
Beach-based sea turtle conservation programs
May marks the peak of nesting season for hawksbill and green turtles along the southern beaches. Conservation programs at Praia Jalé and other nesting sites conduct night patrols where you can observe females coming ashore to lay eggs - something you'll only see between November and May, with May being particularly active. Patrols typically run from 8pm to midnight, walking stretches of beach with red-filtered lights that don't disturb the turtles. You might wait an hour or see three turtles - it's wildlife, not a zoo. The experience of watching a 90 kg (200 lb) turtle excavate her nest and lay 100+ eggs is genuinely moving.
Local market and street food exploration
May brings peak season for breadfruit and jackfruit, which show up everywhere in São Tomé's markets and street food. Mercado Municipal in São Tomé town operates daily but Saturday mornings are when vendors from across the island bring produce, fresh fish, and prepared foods. You'll find calulu (fish stew with palm oil and okra), banana pão (banana bread), and fresh palm wine being sold from repurposed water bottles. The covered market stays relatively comfortable even in May's humidity. Street food stalls around the market and along the waterfront serve grilled fish, chicken muamba, and funge (cassava porridge) for 50,000-100,000 STD per meal.
Lagoa Azul and northern coast boat excursions
The protected lagoon at Lagoa Azul offers some of the island's calmest swimming and snorkeling, particularly valuable in May when you might get occasional chop on the open coast. The bright blue water sits in a natural pool formed by volcanic rock, with coral formations and tropical fish easily visible in the clear shallow water. Boat trips from São Tomé town typically combine Lagoa Azul with stops at other northern beaches and snorkeling spots. May's calmer seas make these all-day boat excursions more reliable than during the rainy season when trips get cancelled for weather.
May Events & Festivals
International Workers' Day celebrations
May 1st is a major public holiday with parades and gatherings in São Tomé town, reflecting the country's socialist history and strong labor movement. Government offices and many businesses close, but it creates a festive atmosphere with music and street vendors. Not a tourist event per se, but interesting cultural context if your dates overlap.