São Luís
Brazil
Long-term weather forecast
Long-term weather forecast

March weather forecast and climate
São Luís, Brazil

The first month of the autumn, March, is still a warm month in São Luís, Brazil, with temperature in the range of an average high of 29.4°C (84.9°F) and an average low of 23°C (73.4°F).

Temperature

February and March, with an average high-temperature of 29.4°C (84.9°F), are the coldest months.

Heat index

The average heat index in March is calculated to a torrid 38.2°C (100.8°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, clothing, metabolic differences). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in São Luís is 89%.

Rainfall

In São Luís, during 23 rainfall days, 428mm (16.9") of precipitation is typically accumulated. In São Luís, Brazil, during the entire year, the rain falls for 130 days and collects up to 2290.2mm (90.2") of precipitation.

Sea temperature

With an average sea temperature of 28.9°C (84°F), March is the month with the warmest seawater.
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day is 12.1h.

Sunshine

March has the least sunshine of the year in São Luís, with an average of 3.5h of sunshine.

UV index

January through April, September through December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: In March, the average maximum UV index of 12 translate into the following recommendations:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in São Luís?

February and March, with an average high-temperature of 29.4°C (84.9°F), are the coldest months in São Luís.

What is the temperature in March in São Luís?

The average high-temperature, in March, in São Luís, is 29.4°C (84.9°F), while the average low-temperature is 23°C (73.4°F). In March, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that factores the actual air temperature with the relative humidity, is appraised at 38.2°C (100.8°F).

What is the average humidity in March in São Luís?

In São Luís, the average relative humidity in March is 89%.

How many days does it rain in March in São Luís?

In São Luís, in March, during 23 rainfall days, 428mm (16.9") of precipitation is typically accumulated.

When is the sea warmest in São Luís?

The month with the warmest seawater in São Luís, Brazil, is March, with an average sea temperature of 28.9°C (84°F).

What is the water temperature in March in São Luís?

In São Luís, the average seawater temperature in March is 28.9°C (84°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in March in São Luís?

The average length of the day in March in São Luís, Brazil, is 12.1h.

What is the month with the least sunshine in São Luís?

March has the least sunshine of the year in São Luís, with an average of 3.5h of sunshine.

How long on average sun shines in March in São Luís?

In March, the average sunshine in São Luís is 3.5h.

What are the months with the highest UV index in São Luís?

January through April, September through December, with an average maximum UV index of 12, are months with the highest UV index.

What is the UV index reading in March in São Luís?

The average daily maximum UV index in March is 12. A UV Index of 11, and more, symbolizes an extreme health threat from unsafe exposure to the Sun's UV rays.
Average temperature in March - São Luís, Brazil
  • Average high temperature in March: 29.4°C

The warmest month (with the highest average high temperature) is November (31.4°C).
Months with the lowest average high temperature are February and March (29.4°C).

  • Average low temperature in March: 23°C

Months with the highest average low temperature are November and December (24°C).
The coldest month (with the lowest average low temperature) is July (22.6°C).

Average humidity in March - São Luís, Brazil
  • Average humidity in March: 89%

The month with the highest relative humidity is April (90%).
The month with the lowest relative humidity is December (71%).

Average rainfall in March - São Luís, Brazil
  • Average rainfall in March: 428mm

The wettest month (with the highest rainfall) is April (475.9mm).
The driest month (with the lowest rainfall) is October (7.6mm).

Average rainfall days in March - São Luís, Brazil
  • Average rainfall days in March: 23 days

The month with the highest number of rainy days is March (23 days).
Months with the lowest number of rainy days are October and November (1 days).

Average sea temperature in March - São Luís, Brazil
  • Average sea temperature in March: 28.9°C

The best month for swimming (with the highest average sea temperature) is March (28.9°C).
The coldest month (with the lowest average sea temperature) is September (27.3°C).

Average daylight in March / Average sunshine in March - São Luís, Brazil
  • Average daylight in March: 12.1h

Months with the longest days are January and December (Average daylight: 12.3h).
Months with shortest days are May, June, July and August (Average daylight: 12h).

  • Average sunshine in March: 3.5h

The month with most sunshine is August (Average sunshine: 8.4h).
The month with least sunshine is March (Average sunshine: 3.5h).

Average UV index in March - São Luís, Brazil
  • Average UV index in March: 12

Months with the highest UV index are January, February, March, April, September, October, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 10).