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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 excellent 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.
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
*
São Luís Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in São Luís - and find the best time to visit.
Best Places in Brazil in September
Find out more about the weather in Brazil and which places have the best travel conditions in this month. See all of Brazil in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
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.
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Swimming10/10 -
Cycling8/10 -
Walking8/10 -
Barbeque10/10 -
Camping9/10 -
Outdoor sports8/10
São Luís 3-Day Forecast
More climate data for São Luís
Temperature Rainfall Sunshine Humidity
See the full São Luís climate overview or explore weather in Brazil.
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Where to go in September - average daytime high across popular destinations.
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