Temperatures in September
It's hot in September in São Luís with an average temperature of 33°C. Temperatures this month range from a low of 32°C to a high of 34°C. At night, you can expect temperatures between 22°C and 23°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for São Luís in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in São Luís with hot temperatures, averaging around 33°C during the day and nights close to 23°C. There’s little chance of precipitation. The weather is mostly sunny and dry. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-September
By mid-September, the average daytime temperature stays the same at 33°C, with nights close to 23°C. Not much precipitation expected during this period. It’s mostly dry with sunshine. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of September
By the end of September, the average daytime temperature in São Luís will be around 34°C, with nights close to 23°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Discover cheap trips to São Luís 
Precipitation in September
According to weather history, there is only 8,3 mm of precipitation in September. The wind speed is around 5 Bft, mostly coming from the Southeast.
The average chance of precipitation is only 9% in September.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for São Luís. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
São Luís in September |
London | ||
|---|---|---|---|
 Average Temperature |
33°C | 20°C | |
 High Temp |
34°C | 22°C | |
| Low Temp |
32°C | 17°C | |
 Total Precipitation |
8,3 mm | 44 mm | |
| Rainy Days |
3 days | 8 days | |
August
UV index
The UV index is a maximum of 10 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit São Luís?
September is a great month to be in São Luís for sunny weather. You’ll get high temperatures and not too much rain this month.
Temperature records for São Luís in September
With 37°C, São Luís hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 28°C in 2014. The extreme night temperatures ranged from a low of 19°C to a high of 26°C.
Check out the climate of São Luís for all months and discover the best travel time
Curious about the climate in other parts of Brazil? Check out the weather and climate in places like Rio de Janeiro, Salvador, Pipa, or have a look at other destinations in Brazil.
Plan your next holiday
Don’t miss the best holiday deals for São Luís and see what our partners have for you.
Daily Temperature in September in São Luís
This chart shows the average daily temperatures, both day and night, for each day in September in São Luís, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in São Luís
The chart below shows the average daily precipitation in September for São Luís, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 3 days of rain in São Luís.
Daily UV Index in September in São Luís
This chart shows the average daily UV index in September in São Luís, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in São Luís Over the Years
This chart shows the average temperature in September in São Luís, measured in degrees Celsius, over the past years.
Total Precipitation in September in São Luís Over the Years
This chart shows the average precipitation in September in São Luís, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for São Luís
Click on a specific day in September for detailed info on the typical weather on that day in São Luís. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in São Luís
Have you been to São Luís in September?
Share your weather experience in September in São Luís.
Average Weather in São Luís by Month
Click on a month below to see detailed weather info for São Luís. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
