Sao Luis weather in September 2025

Expect daytime maximum temperatures of 90°F in Sao Luis, Brazil in September and very high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average.

  • 90°F maximum daytime temperature in September in Sao Luis90
    90°F max day temperature
  • 8 hours of sunshine per day
  • 6 days with some rainfall in September in Sao Luis6
    6 days with some rainfall
  • 75°F minimum night-time temperature in September in Sao Luis75
    75°F min night temperature
  • 12 hours of daylight per day in September in Sao Luis12
    12 hours of daylight per day
  • Very high heat & humidity in September in Sao LuisVH
    Very High heat & humidity
  • 0.7 inches monthly rainfall in September in Sao Luis0.7
    0.7 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Sao Luis11
    11+ (Extreme) UV index
  • 81°F sea temperature in September in Sao Luis81
    81°F sea temperature

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The September weather guide for Brazil (Sao Luis) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Sao Luis in September?

Daytime temperatures usually reach 90°F in Sao Luis in September with very high heat and humidity, falling to 75°F at night.

How sunny is it in Sao Luis in September?

There are normally 8 hours of bright sunshine each day in Sao Luis in September - that's 69% of daylight hours.

How warm is the sea around Sao Luis in September?

The average sea temperature around Sao Luis in September is 81°F.

Does it rain in Sao Luis in September?

There are usually 6 days with some rain in Sao Luis in September and the average monthly rainfall is 0.7 inches.

Sao Luis September sunrise & sunset times

Browse the sunrise and sunset times for Sao Luis in September 2025. Select a month to view Sao Luis sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:55 17:59
Monday, 15th September 2025 05:50 17:55
Tuesday, 30th September 2025 05:43 17:51

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