Sao Sebastiao

Planning your day in São Sebastião or just want to keep up with the weather's whims? In this section, you'll find the most up-to-date information, including forecasts and visual weather charts.

The city of São Sebastião, located in Brazil, enjoys a warm and humid climate that can be described as tropical. Air temperatures remain comfortable year-round without sharp fluctuations. Annual averages range from a pleasant 19.5°C to a hot 25.2°C, making the city an attractive destination at any time.

Despite relatively low rainfall in millimeters (peaking at 10 mm in February), São Sebastião sees a significant number of rainy days, especially in the summer months (December to March), when the number of "wet days" reaches 21–24 per month. This suggests frequent but likely light rainfall. The winter months (June–August) are characterized by the lowest rainfall and fewer "wet days" (around 7–11 days), along with the "coolest" temperatures, though they remain very warm.

Therefore, when planning a trip to São Sebastião, you can expect warm weather year-round. The summer period (December–March) will be the hottest and most likely to have frequent, albeit light, rain. Winter (June–August) offers slightly cooler temperatures and fewer rainy days, which may be more comfortable for some travelers.

The climate in São Sebastião is characterized by warm temperatures throughout the year, with moderate seasonal fluctuations. The hottest month is January, when the average air temperature is around 25.2°C, and daytime highs reach 27.2°C. Similar warm conditions are observed in February and March. The coolest months are July and August, with an average temperature of about 19.5°C–19.6°C. During this period, minimum nighttime temperatures can drop to 16.9°C, making the nights pleasantly fresh.

The summer season in São Sebastião, which runs from December to March, is marked by consistently warm and sometimes hot weather. Daytime temperatures during this time usually stay between 25–27°C, while nighttime temperatures don't drop below 21–23°C. Given the high number of rainy days in these months, summer can feel quite humid. The winter months, from June to August, bring a milder and more refreshing coolness. During the day, the temperature averages 22–23°C, dropping to a comfortable 17–18°C at night. Overall, daily temperature fluctuations in São Sebastião are not very large, typically around 4–5°C, ensuring there are no sharp changes between daytime warmth and nighttime coolness.

In São Sebastião, precipitation occurs throughout the year; however, its intensity and frequency vary significantly by month. While there is no clearly defined torrential rainy season, there are periods with more or less rainfall.

The highest amount of rainfall and rainy days usually occurs during the Southern Hemisphere's summer months and surrounding periods. For instance, February is often the wettest month in terms of total volume, averaging 10 mm, with rain occurring on about 23 days. January is also characterized by high humidity, with about 8 mm of precipitation and the highest number of rainy days in the year—an average of 24 days. March (8 mm, 21 rainy days) and December (7 mm, 22 rainy days) also fall within this wetter period. Increased rain frequency is also seen in October (about 5 mm, 21 rainy days) and November (about 6 mm, 18 rainy days).

The drier period in São Sebastião usually lasts from April to September. July stands out as the driest month of the year, with an average of only 2 mm of rainfall and the number of rainy days dropping to about 7. May, June, and September also see relatively low rainfall (around 3 mm) and about 11–12 rainy days. It's important to note that even in the wettest months, total precipitation remains low. Combined with the high number of rainy days, this suggests that São Sebastião is characterized by frequent but generally short and light rain or drizzle, rather than intense downpours.

When planning your trip to São Sebastião, keep in mind its warm and humid climate, typical of Brazil. The average annual temperature fluctuates between 19.5°C and 25.2°C, making the city a great destination year-round. However, take note of the number of rainy days: it is quite high, especially from October to March (up to 24 rainy days per month), although the rainfall itself is usually not heavy. Therefore, your luggage should definitely include light, breathable clothing, comfortable walking shoes, sunscreen, a hat, and sunglasses. Don't forget a compact umbrella or a light raincoat, as well as insect repellent.

During the hottest months, from December to March (average temperature around 25°C), you will mostly need summer clothes: shorts, T-shirts, dresses, and swimwear. In the cooler period, from June to August (average temperature around 20°C, with lows of 17°C at night), it will still be warm during the day, but for evening walks or in case of changeable weather, it's worth bringing a light sweater, cardigan, or windbreaker. Layering is your best ally in São Sebastião, allowing you to easily adapt to temperature changes throughout the day and be ready for a sudden light shower.