Things to Do in São Tomé and Príncipe in May
May weather, activities, events & insider tips
May Weather in São Tomé and Príncipe
Is May Right for You?
Advantages
- Gravana season brings calmer seas along the northeast coast - water visibility improves to 15-20 m (50-65 ft) making this genuinely one of the best months for diving and snorkeling around Ilhéu das Rolas and the coral formations off Lagoa Azul
- Cocoa harvest is in full swing across the roças - you can actually watch the fermentation process at abandoned plantations like Roça São João dos Angolares, and the chocolate workshops are running daily demonstrations with fresh beans
- Shoulder season pricing means accommodation costs drop 20-30% compared to July-August European holiday peaks, and you'll have beaches like Praia Jalé practically to yourself on weekdays
- Humpback whales migrate through São Tomé waters from July through October, but May marks the start of increased marine activity - you might spot dolphins and sea turtles with far fewer boats competing for sightings
Considerations
- Gravana season means unpredictable weather patterns - you'll get sunny mornings that turn into heavy afternoon downpours within 20 minutes, which can disrupt hiking plans to Pico Cão Grande or the Obo National Park trails
- Some southern coastal roads become challenging after rain - the route from São João dos Angolares to Porto Alegre can develop muddy sections requiring 4WD, adding 45-60 minutes to what should be a 90-minute drive
- May sits in the transition between seasons, so while it's not peak rainy season, it's humid enough (70% average) that clothes take forever to dry and camera equipment needs constant attention to prevent moisture damage
Best Activities in May
Obo National Park rainforest trekking
May's rainfall keeps the primary forest incredibly lush, and the cooler morning temperatures of 22-24°C (72-75°F) make the steep climbs more manageable. The waterfalls like Cascata São Nicolau are running strong, and you're likely to spot endemic birds like the São Tomé fiscal and dwarf olive ibis during their active feeding periods. Start hikes by 7am to avoid afternoon storms - most trails become slippery after rain but are perfectly navigable in morning conditions.
Roça plantation heritage tours
The cocoa harvest runs from April through June, and May is peak fermentation season. You can visit working and abandoned roças like Roça Agostinho Neto and watch the entire bean-to-bar process. The Portuguese colonial architecture photographs beautifully under May's diffused cloud cover, and the humidity actually enhances the rich smell of fermenting cocoa. Many roças offer chocolate-making workshops using beans harvested that same week.
Ilhéu das Rolas snorkeling and diving
May marks the beginning of gravana season when northeastern trade winds calm down, creating excellent visibility conditions of 15-20 m (50-65 ft) around the equator monument island. Water temperature hovers around 26-27°C (79-81°F), comfortable without a wetsuit. The coral reefs are less crowded than peak season, and you'll likely spot barracuda, moray eels, and occasional manta rays. Afternoon weather can be unpredictable, so morning departures work best.
São Tomé Town market and street food exploration
The Mercado Municipal comes alive early morning with fresh catch from overnight fishing trips and produce from the interior plantations. May brings breadfruit season and fresh palm oil production - you'll find calulu stew and banana fish at their best. The covered market stays comfortable even during midday humidity, and afternoon rain actually makes the street food scene more atmospheric around 5-6pm when vendors set up grilled fish stands near the waterfront.
Lagoa Azul kayaking and beach time
This stunning blue lagoon on the northeast coast benefits from May's calmer gravana conditions - the protected waters stay relatively flat even when the open ocean gets choppy. Morning light creates incredible turquoise colors for photography, and the surrounding coconut groves provide shade during the humid midday hours. Kayak rentals let you explore the mangrove channels where you might spot kingfishers and crabs. Pack a picnic since facilities are minimal.
Pico Cão Grande viewpoint hikes
The iconic 663 m (2,175 ft) volcanic plug looks dramatic against May's moody cloud cover, and the surrounding rainforest trails offer cooler temperatures than drier months. The hike to the main viewpoint takes 2-3 hours round trip through dense jungle - muddy in sections but manageable with proper boots. Morning departures essential since afternoon clouds often obscure the peak entirely. The endemic vegetation is incredibly green this time of year, and you'll hear the constant calls of São Tomé thrushes.
May Events & Festivals
Labour Day celebrations
May 1st brings public celebrations in São Tomé Town with music performances, traditional dancing groups, and street food vendors setting up along the Marginal waterfront. It's more of a local family day than a tourist event, but it offers genuine insight into Santomean culture. Expect most businesses closed, but the informal atmosphere makes for great people-watching and photography opportunities.