Weather in Porto Alegre

Planning a trip or already in the city of Porto Alegre? In this section, you will find the most up-to-date information on weather conditions, including detailed forecasts and clear charts that will help you plan your day.

The climate in Porto Alegre, located in southern Brazil, is characterized as humid subtropical. The city experiences clearly defined seasons with noticeable temperature fluctuations throughout the year. Summer, from December to March, is hot here: the average maximum temperature often reaches 28-30°C, and the average air temperature during these months is about 24-26°C. Winter, occurring in June-August, brings cooler weather with average temperatures around 15-16°C, while night-time minimums can drop to 10-12°C. Spring and autumn are transitional periods with comfortable, moderate temperatures.

Regarding precipitation, the data indicates a small total amount throughout the year, averaging 3-6 mm per month. However, the number of rainy days is quite significant, ranging from 8 to 14 monthly. This combination – low rainfall volume with frequent occurrence – suggests that rains in Porto Alegre are generally very light and brief, possibly in the form of drizzle or short light showers. It is this regular, albeit not abundant, moisture, along with other climatic factors, that contributes to the humid sensation characteristic of the subtropical climate. Travelers should consider the likelihood of frequent but not heavy rainfall at any time of year and carry light waterproof clothing or an umbrella.

The climate in Porto Alegre is characterized by warm summers and mild winters. The annual range of average temperatures is quite significant: from a cool 14.9°C in July to a hot 25.9°C in January. The hottest month is typically January, when average maximum temperatures reach 30.4°C, and the coldest is July, with average minimum temperatures around 10.5°C.

The summer months in Porto Alegre, which fall between December and March, are distinguished by hot weather. Average daily temperatures in January and February confidently stay above 25°C, and daytime highs often exceed 30°C. Nights also remain warm, with temperatures rarely dropping below 20°C, creating the feeling of a typical subtropical summer. For example, in January, the average temperature is 25.9°C, with daytime peaks up to 30.4°C and nighttime lows around 21.4°C.

Winter, from June to August, is quite mild in Porto Alegre. Average temperatures during this period fluctuate around 15-16°C. During the day, the air can warm up to 19-21°C, and at night drop to 10-12°C. Thus, in July, the average temperature is 14.9°C, while during the day the thermometer may show about 19.3°C, and at night drop to 10.5°C. Although frosts are not characteristic, evenings and nights can be quite cool. Noticeable daily temperature fluctuations are observed throughout the year, with the difference between daytime highs and nighttime lows averaging 8-10°C.

In Porto Alegre, precipitation is distributed quite evenly throughout the year, and there is no clearly defined rainy season or long dry period in the classical sense. Monthly rainfall is low, fluctuating between 3 mm and 6 mm. This suggests that heavy and prolonged downpours are the exception rather than the rule here.

The highest average rainfall occurs in September – about 6 mm. The "driest" months by volume are January, February, April, August, and December, when only about 3 mm falls. However, even in these months, rain is not a rarity. For instance, January, despite the low amount of precipitation, can count up to 14 rainy days, indicating frequent but likely light rains or drizzle.

The lowest number of days with precipitation falls in April – on average 8 days. In other months, such as March, September, and October, the number of rainy days can reach 13. Thus, when planning a trip to Porto Alegre, it is worth being prepared for the possibility of rain in almost any season, although the intensity of precipitation is generally low.

When packing your suitcase for a trip to Porto Alegre, consider the features of its subtropical climate with clearly defined seasons. Regardless of the time of year, comfortable shoes for long walks will be your best friend. Since rainy days are not uncommon here (averaging 8 to 14 per month, with rainfall of 3-6 mm), a light umbrella or a compact raincoat should definitely find a place in your luggage. In the summer months, from December to March, when the average temperature holds at 24-26°C and the maximum can reach 30°C, preference should be given to light and breathable clothing made from natural fabrics, shorts, and T-shirts. Don't forget sunscreen, sunglasses, and a hat for protection against the active sun.

In winter, from June to August, Porto Alegre becomes noticeably cooler: the average temperature drops to 15-16°C, and night-time minimums can reach 10-12°C. During this period, you will need jeans, sweaters, warm jumpers, and a light jacket or windbreaker, as the weather can be windy. For the transitional seasons – spring (September-November) and autumn (April-May) – when the weather can be quite changeable, with temperatures averaging from 17°C to 22°C, the principle of layering is the ideal solution. This will allow you to feel comfortable both in the warm daytime hours and on cool evenings, easily adapting to temperature changes and possible precipitation.