São Luís Weather in September

In São Luís, September brings very high daytime temperatures around 31°C (88°F), with nights cooling to 26°C (79°F). It is the driest month of the year, with minimal rainfall.

Rainfall in São Luís in September

Expect fewer clouds and less rain as the month goes on. This makes it an ideal time for outdoor activities. Historically, the month has about 6 days of rain, averaging 18 mm (0.7 in) in total. The occasional light shower is possible, but rain is rarely an issue this month.

Temperature in São Luís in September

São Luís has perfect weather in September, with days reaching 31°C (88°F) and nights cooling to 26°C (79°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. With overnight lows of 26°C (79°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably.

Sunshine in São Luís in September

Expect a lot of sunshine this month, with about 250 hours of sun. These sunny conditions add to the overall experience.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit São Luís.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Brazil, check out our São Luís's climate page.

São Luís Temperature in September

Min Temperature 26°C (79°F)  

Max Temperature 31°C (88°F)  

Chance of Rain 20%  

Precipitation 18 mm (0.7 in)  

Rainy days 6 days  

Humidity 81% *  

Sunshine 250 hours *  

Percentage Sunshine *  

What to Wear in São Luís in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. With minimal rainfall expected, you can leave the rain gear at home. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in São Luís in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

9/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Brazil, check out our São Luís's climate page.

More climate data for São Luís

Temperature Rainfall Sunshine Humidity

See the full São Luís climate overview or explore weather in Brazil.