Weather in Sao Luis in December 2025
- December is usually the hottest month of the year in Sao Luis;
Average weather
Average temperature in Sao Luis in December
Going from a maximum of +91°F during the day to a minimum of +77°F during the night, the temperature in December averages around +88°F.
The average maximum temperature goes down 25% by the end of the month, compared with the beginning of the month, from +88°F to +84°F.
Is Sao Luis warm or cold in December?
Sao Luis is typically hot in December.
Maximum temperatures go up compared to the previous month from +88°F to +88°F. The minimum temperature also goes up from +79°F to +79°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
December is the hottest month in Sao Luis, here is the comparison with other months:
Climate in Sao Luis in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +88°F | +88°F | +84°F | ||||
| Min. temperature | ||||||
| +73°F | +68°F | +70°F | ||||
| Max. temperature | ||||||
| +93°F | +93°F | +93°F | ||||
| Rainfall | ||||||
| 26 mm | 88 mm | 230 mm | ||||
| Wind | ||||||
| 5 m/s | 4 m/s | 3 m/s | ||||
| Humidity | ||||||
| 75% | 77% | 82% | ||||
| Air pressure | ||||||
| 1009 HPa | 1009 HPa | 1010 HPa | ||||
| Sunny days | ||||||
| 4 | 2 | 0 | ||||
| Cloudy days | ||||||
| 10 | 6 | 1 | ||||
| Rainy days | ||||||
| 16 | 23 | 28 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
December typically has worse weather conditions compared to November. The temperature levels stay the same in the area of +88°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 26 mm to 88 mm. Humidity rises from 75% to 77%. Winds are calmer in comparison to November, going down from 5 m/s to 4 m/s on average. The days becoming less sunny, going from 4 sunny days in November to 2 in December.
January brings much the same weather, it remains ok.
Wind
The average wind speed is 5 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Sao Luis is gradually decreasing during December, going from 5 m/s to 2 m/s over the course of the month.
Rain
How was the weather last December in Sao Luis?
Climate Change Over the Years
The climate in Sao Luis in December has not changed that much over the last 43 years.
The average temperature was the lowest in 1985 (+84°F) and the highest in 2017 (+88°F). The driest year was 1983 with only 1125 mm of rainfall, and the wettest year was 1985 with 3380 mm.
FAQ
Is December a good time to visit Sao Luis?
Can you sunbathe in Sao Luis in December?
Is Sao Luis rainy in December?
Is it sunny in Sao Luis in December?
Other cities in Brazil
Monthly weather in Sao Luis
Source of the data
For this page, we’ve looked at the typical weather in Sao Luis, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
