São Tomé - When to Visit

When to Visit São Tomé

Climate guide & best times to travel

Monthly Climate Data for São Tomé Average temperature and rainfall by month Climate Overview 15°C 20°C 25°C 30°C 35°C Rainfall (mm) 0 66 132 Jan Jan: 29.0°C high, 22.0°C low, 81mm rain Feb Feb: 29.0°C high, 22.0°C low, 84mm rain Mar Mar: 30.0°C high, 22.0°C low, 132mm rain Apr Apr: 30.0°C high, 22.0°C low, 122mm rain May May: 29.0°C high, 22.0°C low, 112mm rain Jun Jun: 28.0°C high, 21.0°C low, 18mm rain Jul Jul: 27.0°C high, 20.0°C low Aug Aug: 27.0°C high, 20.0°C low Sep Sep: 28.0°C high, 21.0°C low, 18mm rain Oct Oct: 28.0°C high, 21.0°C low, 109mm rain Nov Nov: 29.0°C high, 22.0°C low, 99mm rain Dec Dec: 29.0°C high, 22.0°C low, 109mm rain Temperature Rainfall
São Tomé sits almost exactly on the equator, and its weather reflects that geography in ways both obvious and occasionally surprising. The island runs warm year-round. Temperatures hover between 27°C (81°F) and 30°C (86°F) at their peak, rarely dipping below 20°C (68°F) at night even in the coolest months. Calling it simply "hot and humid" misses most of the story. The real rhythm here is defined by rainfall rather than temperature. São Tomé experiences something closer to two distinct seasons than anything resembling the four-season calendar most visitors are used to. The long dry season, locally called the Gravana, runs roughly from mid-June through September. July and August are the driest months on record, sometimes seeing no measurable rain at all. Temperatures tend to ease off slightly, with highs around 27°C (81°F) giving the air a relatively fresher quality compared to the wetter months. Humidity stays constant at around 70% throughout the year. That part doesn't change much. The absence of frequent downpours makes this period feel noticeably more comfortable for being outdoors. The trade winds pick up during the Gravana, which helps. From October through May, the rains return in earnest. March and April are the heaviest months, with rainfall typically around 130mm and 120mm respectively. The landscape turns intensely green as a result. Interestingly, there's a brief lull around June and September that is a shoulder period. Rain totals drop to just 18mm, making these transitional months often underestimated by travelers. What makes São Tomé's weather distinctive among equatorial destinations is how localized conditions can be. The island's volcanic terrain and dense interior forest create microclimates. The southern coast might be getting a downpour while the northern beaches stay clear. Elevation matters too. The interior peaks can be shrouded in cloud when the coast is open and sunny. For practical purposes, expect afternoon showers during the wet season rather than day-long rain. Plan accordingly.

Best Time to Visit

Recommended timing for different travel styles.

Beach and relaxation
The Gravana months of July and August are the clear choice. Minimal rain, manageable heat at 27°C (81°F), and calmer seas on the northern and western beaches. June and September work almost as well. Fewer fellow travelers.
Cultural exploration
The shoulder months of June and October offer a reasonable compromise. You get the start of festivals and local activity as the wet season ebbs or builds. Occasional rain tends not to linger all day.
Adventure and hiking
Some travelers might prefer the wet season, counterintuitively. The interior trails through São Tomé's rainforest are at their most dramatic from February through April. Waterfalls run full and the forest is at its most alive. Expect trails to be slick. Pack accordingly.
Budget travelers
Budget travelers tend to find the wet season, November through February outside of the Christmas spike, offers more flexible accommodation options. The Gravana high season draws the most visitors. Prices reflect that.

What to Pack

Essentials and seasonal recommendations for São Tomé.

Year-Round Essentials
Lightweight, quick-dry clothing
Lightweight clothing is essential year-round. Natural fibers breathe better in constant humidity than synthetics. Anything that dries slowly becomes a liability if you're moving between activities.
A packable rain jacket or a compact umbrella
A light rain jacket is worth carrying in every month except perhaps the peak of July and August. Even then the occasional afternoon cloud can catch you off guard.
Reef-safe sunscreen
High-SPF sunscreen is worth bringing in reasonable quantities. Sun protection at this latitude is non-negotiable.
A reusable water bottle that you can keep cool
A reusable water bottle is practical. Staying hydrated in humidity you might not immediately feel is easier said than done.
Good walking sandals with grip and a pair of closed-toe shoes for forest trails
cover most situations.
An insect repellent containing DEET or a DEET alternative
Pack insect repellent. Essential near mangroves or forest edges at dusk.
A small dry bag
A dry bag guards electronics and documents through the wet season. Same bag becomes your beach kit once the rains stop.
Gravana (June through September)
Clothing
Leave the heavy rain shell at home. Bring one light layer for trade-wind evenings on the terrace. Elevation adds chill.
Layering Tip
a light layer for evenings in the trade winds is occasionally appreciated
Wet season
Clothing
Fast-dry trousers and shirts beat jeans every time. Denim stays damp and clings in humid heat.
Footwear
Grip matters. Forest trails turn muddy from October to May. Flip-flops stay on the beach.
Plug Type
Type C and Type F European two-pin plugs
Voltage
220 volts at 50Hz
Adapter Note
North American travelers need a plug adapter and maybe a voltage converter. Most laptops, phone chargers, and camera batteries accept 100-240V. Check the label.
Skip These Items
Skip the fleece. Nighttime lows hover around 20°C (68°F) even in the coolest months. Air conditioning rarely overpowers. Leave polished dress shoes at home. Heat, humidity, and surprise mud will ruin them. a hairdryer, unless yours is dual-voltage, is more hassle than it's worth. São Tomé rewards light packing. The island's rhythm needs little wardrobe. Laundry services wait in town.
Full Packing Checklist

Interactive checklist with shopping links for every item you need.

View São Tomé Packing List →

Month-by-Month Guide

Climate conditions and crowd levels for each month of the year.

January

January brings temperatures peaking around 29°C (84°F) with lows around 22°C (72°F). Rainfall of roughly 81mm produces regular afternoon showers. Rarely the sustained downpours that define March.

High 29°C (84°F)
Low 22°C (72°F)
Rainfall 81mm
Crowds moderate, ticking up slightly around the holiday period.
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February

February is marginally wetter at 84mm. Temperatures stay much the same. This month tends to see some of the year's most dramatic cloud formations over the central peaks.

High 29°C (84°F)
Low 22°C (72°F)
Rainfall 84mm
Crowds low, which suits independent travelers well.
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March

March is the wettest reliable month São Tomé gets. Around 132mm of rain and high temperatures reaching 30°C (86°F). The heat combined with frequent showers gives the air a thick, tropical quality. The forest is exceptional.

High 30°C (86°F)
Low 22°C (72°F)
Rainfall 132mm
Crowds low.
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April

April remains in the wet season with 122mm of rainfall and highs of 30°C (86°F). The showers often clear by mid-afternoon. The evenings can be pleasant.

High 30°C (86°F)
Low 22°C (72°F)
Rainfall 122mm
Crowds Still low crowds.
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May

May marks the tail end of the long rains. 112mm typically falls but the frequency of showers starts to ease. Temperatures nudge back to 29°C (84°F). A reasonable month for travelers who want the green landscape without the peak March rainfall.

High 29°C (84°F)
Low 22°C (72°F)
Rainfall 112mm
Crowds Low crowds.
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June

June is a genuine transition month. Rainfall drops sharply to around 18mm. Highs ease to 28°C (82°F) and lows to 21°C (70°F). The trade winds begin asserting themselves. For many visitors this is when São Tomé starts to feel noticeably more comfortable.

High 28°C (82°F)
Low 21°C (70°F)
Rainfall 18mm
Crowds medium and building.
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July

July is as dry as it gets. Essentially no recorded rainfall and highs around 27°C (81°F). The coolest month of the year, which in equatorial terms still means warm but not oppressive.

High 27°C (81°F)
Low 20°C (68°F)
Rainfall essentially no recorded rainfall
Crowds peak season and crowds reflect that.
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August

August matches July almost exactly in temperature and rainfall. The other peak month. The beaches are at their most reliably clear and the sea conditions tend to be calm on the calmer-water coasts.

High 27°C (81°F)
Low 20°C (68°F)
Rainfall essentially no recorded rainfall
Crowds High crowds.
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September

September sees the Gravana beginning to wind down. A little rain returns (around 18mm). Temperatures creep back up to 28°C (83°F). The winds are still present and conditions remain good.

High 28°C (83°F)
Low 21°C (70°F)
Rainfall 18mm
Crowds Medium crowds, and often a sweet spot for experienced travelers.
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October

October is the beginning of the short rainy season. 109mm of rainfall returning and temperatures sitting around 28°C (83°F) at the high end. The showers are frequent but the island has a lush energy to it.

High 28°C (83°F)
Low 22°C (72°F)
Rainfall 109mm
Crowds Low to medium crowds.
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November

November brings similar conditions at 99mm of rain and highs around 29°C (84°F). It tends to be a quiet month that rewards patience with the weather.

High 29°C (84°F)
Low 22°C (72°F)
Rainfall 99mm
Crowds Low crowds.
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December

December rounds out the year with 109mm of rainfall and temperatures at 29°C (84°F). The period around the holidays brings a noticeable uptick in visitors and prices. Outside of that window, the month is relatively low-key.

High 29°C (84°F)
Low 22°C (72°F)
Rainfall 109mm
Crowds low-key, with an uptick around the holidays.
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