March weather forecast
Porto Alegre, Brazil

The weather in March in Porto Alegre is marked by a dip in temperature to 28°C (82.4°F) and a slight increase in humidity. The rainfall remains constant from the previous month, providing relief from the heat. March days in Porto Alegre are filled with intermittent sunshine leading to pleasant weather conditions for outdoor pursuits. Despite the slight chill in the air, the sea remains warm enough for swimming. It is advisable to carry umbrellas or raincoats while going out.

Temperature

March in Porto Alegre brings an average high-temperature of a warm 28°C (82.4°F), nearly identical to the preceding month. In the month of March, the average temperature in Porto Alegre dips to an enjoyable 18.2°C (64.8°F) during the night.

Heat index

The heat index value for March is calculated to be a hot 31°C (87.8°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', measures the perceived warmth when incorporating the humidity present in the air. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.

Humidity

In March, the average relative humidity in Porto Alegre is 75%.

Rainfall

In Porto Alegre, in March, during 12.4 rainfall days, 51mm (2.01") of precipitation is typically accumulated. Throughout the year, there are 148.3 rainfall days, and 805mm (31.69") of precipitation is accumulated.

Sea temperature

In Porto Alegre, Brazil, the average seawater temperature in March is 24.1°C (75.4°F).
Note: For someone not comfortable with cold, swimming in 24.1°C (75.4°F) waters might be a stretch. However, with favorable conditions like abundant sunshine, mild wind, and warm air temperatures, the experience can be improved. And while wetsuits are not a must, they can be considered.

Daylight

In March, the average length of the day in Porto Alegre is 12h and 15min.
On the first day of the month, sunrise is at 06:16 and sunset at 18:57. On the last day of March, in Porto Alegre, sunrise is at 06:35 and sunset at 18:22 -03.

Sunshine

In March, the average sunshine is 8h.

UV index

In March, the average daily maximum UV index in Porto Alegre is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In March, the maximum UV index of 6 translates into these guidelines:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Take note! The UV strength of the Sun elevates when reflected off water and sand.