São Tomé and Príncipe, a hidden paradise in the Gulf of Guinea, offers pristine beaches, lush rainforests, and rich Portuguese colonial heritage. This tiny island nation is perfect for eco-tourism, whale watching, and experiencing authentic African-Portuguese culture in one of the world's least visited destinations.
São Tomé and Príncipe sits on the equator in the Gulf of Guinea, giving it a hot, humid tropical climate year-round with temperatures consistently between 25–32°C (77–90°F) at sea level. The islands experience two distinct seasons — a long dry season (gravana) from June to September and a long rainy season (gravanito) from October to May, with a shorter dry spell in December–January. Rainfall is heaviest on the southern and mountainous parts of both islands, while the northern coast tends to be drier.
Best time to visit
Best: June-September (dry season, whale watching)
Peak Season: June-September (dry season, whale watching)
Shoulder Season: December-February (short dry season, turtle nesting)
Avoid: March-May, October-November (rainy seasons, lush landscapes)
Best Reason:
Avoid Reason:
Month-by-month weather
Typical conditions throughout the year.
January
26C/79F
Short dry season ending, warm and relatively dry with occasional showers
February
27C/81F
Rainy season beginning, increasing humidity and afternoon showers
March
28C/82F
Heavy rains, very humid, trails muddy — not ideal for hiking or beach visits
April
28C/82F
Peak rainy season with daily downpours, very lush and green, lowest visitor numbers
May
27C/81F
Rains tapering off toward month end, still humid with frequent showers
June
26C/79F
Dry season begins, clearer skies, calmer seas, whale season starts — excellent conditions
July
25C/77F
Peak dry season with ideal weather, peak whale watching season beginning
August
25C/77F
Best month overall — dry, pleasant temperatures, peak humpback whale activity
September
26C/79F
Late dry season, still excellent conditions with fewer tourists than August
October
27C/81F
Rainy season resuming, increasing humidity and afternoon showers
November
27C/81F
Heavier rains return, but sea turtle nesting season begins — night tours rewarding
December
26C/79F
Short dry spell begins, good weather returns with Christmas holidays and cultural events
The seasons
What to expect in each part of the year.
Spring
Months: Mar-May
The long rainy season is underway with frequent heavy downpours, high humidity, and lush green landscapes. Rain typically falls in intense afternoon bursts. This is the low season for tourism with significantly lower prices and fewer visitors.
Summer
Months: Jun-Aug
The main dry season (gravana) begins in June and offers the best conditions for outdoor activities, beach time, and hiking. Lower humidity, cooler temperatures in highlands, and calmer seas. Peak whale watching season July–August.
Fall
Months: Sep-Nov
September is the tail end of dry season. October–November bring the shorter rainy season (gravanito) with increasing rainfall and humidity. Sea turtle nesting season begins in November. Landscapes are beautifully verdant.
Winter
Months: Dec-Feb
December–January offer a shorter dry spell (gravana pequena) with reduced rainfall and pleasant conditions. Sea turtle nesting continues on southern beaches. February brings the onset of the long rainy season.
Crowds & peak times
When to expect tourists and when to avoid them.
- High Season
- Jun-Sep (dry season, whale watching, European summer holidays)
- Shoulder Season
- Dec-Jan and Nov (shorter dry season, turtle nesting season)
- Low Season
- Feb-May and Oct (rainy seasons, very few tourists, lowest prices)
Major events & festivals
Time your visit around what matters.
Humpback Whale Migration Season
Thousands of humpback whales migrate to São Tomé and Príncipe's warm waters to mate and calve. Boat tours offer spectacular whale watching opportunities, with August being peak season. Príncipe waters particularly renowned for close encounters.
Sea Turtle Nesting Season
Four species of sea turtles (green, hawksbill, olive ridley, and leatherback) come ashore to nest on São Tomé's beaches. Guided night tours allow visitors to witness this incredible natural phenomenon while supporting conservation efforts.
Independence Day
São Tomé and Príncipe's Independence Day celebrates freedom from Portuguese colonial rule with parades, music, dancing, traditional food, and cultural performances in São Tomé City. Vibrant displays of national pride and Santomean culture.
São Tomé Carnival
Three days of colorful parades, costumes, music, and street dancing before Lent. Smaller than Brazilian Carnival but authentic and full of local culture. Expect samba, traditional African rhythms, and creative costumes.
Chocolate and Coffee Harvest
Visit working plantations during harvest season to see traditional processing methods. Many roças offer tours showing fermentation, drying, and roasting. Perfect time to purchase fresh products directly from producers.
Festival Nacional de Cultura
National Culture Festival showcases Santomean music, dance, art, and cuisine. Multiple days of performances, exhibitions, and cultural events celebrating the islands' African-Portuguese heritage.