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Santos sits on the coast of Sao Paulo state, about 70 km southeast of Sao Paulo city, and its climate stays warm and humid all year. The city gets roughly 2,000 mm of rain annually, every month sees more than 60 mm, and the average relative humidity sits near 81%. Temperatures run from a mild 17°C (63°F) overnight low in July to a 29°C (84°F) daytime high in January and February. Use this month-by-month breakdown to pick your dates, and check the best time to visit Santos guide for the full seasonal picture.
Santos Weather by Month: The Climate at a Glance
Santos has a tropical climate with no real dry season, which is why the city is green and the beaches stay usable year round. The warmest month is February, with a 28.5°C average; the coolest is July, averaging 16.9°C. Summer (December to March) is the hottest and wettest stretch, while winter (June to August) brings slightly cooler, drier days but rarely anything close to cold. Sea temperatures stay swimmable in every month, ranging from about 20°C (68°F) in winter to 26°C (79°F) in late summer.
| Month | Avg High | Avg Low | Rainfall | Sea Temp |
|---|---|---|---|---|
| January | 29°C (84°F) | 24°C (75°F) | 310 mm | 26°C (79°F) |
| February | 29°C (84°F) | 24°C (75°F) | 250 mm | 26°C (79°F) |
| March | 28°C (82°F) | 23°C (73°F) | 210 mm | 26°C (79°F) |
| April | 26°C (79°F) | 21°C (70°F) | 140 mm | 25°C (77°F) |
| May | 24°C (75°F) | 19°C (66°F) | 100 mm | 23°C (73°F) |
| June | 23°C (73°F) | 18°C (64°F) | 90 mm | 21°C (70°F) |
| July | 22°C (72°F) | 17°C (63°F) | 90 mm | 20°C (68°F) |
| August | 23°C (73°F) | 18°C (64°F) | 90 mm | 20°C (68°F) |
| September | 23°C (73°F) | 18°C (64°F) | 120 mm | 20°C (68°F) |
| October | 24°C (75°F) | 19°C (66°F) | 150 mm | 21°C (70°F) |
| November | 26°C (79°F) | 20°C (68°F) | 160 mm | 23°C (73°F) |
| December | 28°C (82°F) | 22°C (72°F) | 240 mm | 25°C (77°F) |
Santos Weather by Month: Summer (December to March)
December
December kicks off the rainy season with about 240 mm of rain and daytime highs around 28°C (82°F). Rain usually falls as short, heavy afternoon downpours, so mornings are often clear. This is a busy month for the beach, with the school holidays starting mid-month. Pack a light rain jacket and expect humid nights near 22°C.
January
January is the wettest month at around 310 mm and one of the hottest, with highs of 29°C (84°F) and lows of 24°C (75°F). The heat and humidity combine for a sticky feel, and rain can arrive on 15 or more days. Beach crowds peak during the summer holidays, so book your Santos hotel well ahead if you travel now.
February
February averages a 28.5°C high, making it the warmest month, with about 250 mm of rain. Carnival often falls in February, drawing big crowds to the beach and street parades. Sea temperatures hold at 26°C (79°F), the warmest of the year. Afternoon storms are common, so plan outdoor activities for the morning.
March
March starts to cool slightly, with highs near 28°C (82°F) and rainfall easing to about 210 mm. The tail of summer is still hot and humid, but the worst of the afternoon storms taper off late in the month. The sea stays at 26°C (79°F).
Santos Weather by Month: Autumn (April to June)
April
April is a transition month, with highs dropping to 26°C (79°F) and rainfall down to about 140 mm. Humidity eases and the beach is far less crowded once the summer holidays end after Easter. This is one of the better months for sightseeing, when the Santos attractions like the Coffee Museum and Monte Serrat are comfortable to visit on foot and the Santos neighborhoods are easy to explore.
May
May brings highs of 24°C (75°F) and lows of 19°C (66°F), with about 100 mm of rain. Days are pleasant and nights turn mild enough for a light jacket after sunset. The sea cools to 23°C (73°F), still fine for swimming for most people. This is a quieter, lower-price month to visit.
June
June is the start of winter, with highs of 23°C (73°F), lows of 18°C (64°F) and about 90 mm of rain. It is noticeably drier than summer, though cold fronts from the south can bring a few grey, drizzly days. The Santos events calendar is thinner now, which suits travelers who want empty beaches.
Santos Weather by Month: Winter (July to September)
July
July is the coolest month, averaging a 16.9°C temperature with daytime highs near 22°C (72°F) and lows of 17°C (63°F). Rainfall drops to about 90 mm, the lowest of the year, and the sea sits at 20°C (68°F). Sunshine is still reliable, and the Santos Jazz Festival runs in late July, giving a reason to visit beyond the beach.
August
August matches July for dryness at roughly 90 mm and is the driest month overall. Highs climb slightly to 23°C (73°F). Winter in Santos is mild compared to most of Brazil, and you will still see locals on the sand on sunny afternoons. Bring a sweater for breezy evenings along the beach garden.
September
September begins the climb back to summer, with highs of 23°C (73°F) and rainfall rising to about 120 mm. Spring weather is changeable, alternating between clear days and passing fronts. The Festa de Nossa Senhora do Monte Serrat on September 8 draws pilgrims to the Monte Serrat funicular, one of the biggest local events of the year.
Santos Weather by Month: Spring (October to November)
October
October brings highs of 24°C (75°F) and about 150 mm of rain as the wet season builds again. The sea warms to 21°C (70°F). This is a solid month for a beach and city combination trip, before the summer crowds return in December.
November
November warms to highs of 26°C (79°F) with around 160 mm of rain. Days are hot again but the beach is still uncrowded, so it is a favorite of travelers who want summer weather without peak prices. The sea reaches 23°C (73°F).
Santos Weather by Month: Sea Temperatures
The Atlantic off Santos ranges from about 20°C (68°F) in July and August to 26°C (79°F) in January through March. Swimmers comfortable in cool water can use the sea year round, while most casual beachgoers find December to April the most pleasant. For arrival and packing advice, see the Santos travel tips and FAQ guide, or start with the full Santos travel guide for an overview.
