São Luis Temperature by Month
The average annual maximum temperature in São Luis, Alentejo, Portugal is 22°C (72°F), with daytime highs ranging from 16°C (61°F) in January to 29°C (84°F) in August. This page covers monthly averages, day-night differences, and how São Luis compares to cities worldwide.
São Luis Monthly Temperatures
The climate in São Luis is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 17°C (63°F) in August to 8°C (46°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in São Luis by month:
Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 340 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: São Luis vs Portugal
The map below shows the annual temperature across Portugal. You can also select individual months if you want to compare a specific time of year.
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São Luis vs World: Temperature Compared
São Luis's average annual maximum temperature is 22°C (72°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Beijing, China averages 20°C (68°F) annually, but with big seasonal swings — very cold winters and hot summers.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in São Luis?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In São Luis, January is the coolest month, with average highs of 16°C (61°F) and humidity around 76% — considered high. In August, the warmest month, temperatures average 29°C (84°F) with 62% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in São Luis this rarely lasts long on the ground.
For more on São Luis's weather — including monthly rainfall, sunshine hours, and humidity — visit our São Luis climate page.
