May could be a good time to visit Sao Luis, as the weather is generally fine. The average high temperature is around +84°F, and there are typically 1 sunny days in May. However, expect about 29 rainy days, and total monthly rainfall of approximately 288 mm. The weather is changeable so pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+84°F
Avg. max. temperature
+72°F
Min.
+91°F
Max.
288 mm
Total precipitation
84%
Avg. humidity
2 m/s
Avg. wind
1 ☀️
Sunny Days
0 ⛅️
Cloudy
29 🌦
Rainy
Our opinion: Sao Luis has OK weather in May.
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Average temperature in Sao Luis in May
Here are the expected maximum, average and minimum temperatures in Sao Luis for May based on the historical data.
Last Year
Historical Data
The expected average maximum temperature in May is +86°F with a maximum of +90°F and a minimum of +77°F.
The average maximum temperature goes up 14% by the end of the month, compared with the beginning of the month, from +84°F to +86°F.
Is Sao Luis warm or cold in May?
Sao Luis is typically warm in May.
Maximum temperatures go up compared to the previous month from +84°F to +84°F. The minimum temperature also goes up from +77°F to +77°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how May is compared to other months in Sao Luis:
Climate in Sao Luis in May
Sao Luis weather looks like this, on average, in May and the surrounding months.
April
May
June
Avg. temperature
+84°F
+84°F
+86°F
Min. temperature
+73°F
+72°F
+73°F
Max. temperature
+91°F
+91°F
+93°F
Rainfall
406 mm
288 mm
158 mm
Wind
2 m/s
2 m/s
2 m/s
Humidity
86%
84%
82%
Air pressure
1010 HPa
1011 HPa
1012 HPa
Sunny days
0
1
1
Cloudy days
0
0
1
Rainy days
28
29
27
Snowy days
0
0
0
May weather is still as ok as in April.The temperature levels stay the same in the area of +84°F for average maximum temperature during the day.As May arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 406 mm to 288 mm.It feels drier, as humidity decreases from 86% to 84%.The average wind speed doesn’t change much during May, staying around 2 m/s.The good news is there are likely to be more sunny days in May, from 0 to 1.
Wind speed in Sao Luis in May based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Sao Luis is gradually decreasing during May, going from 3 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during May in Sao Luis based on historical data.
Last Year
Historical Data
Total precipitation in May is about 198 mm, with a 97% chance of rain on a typical day. The maximum amount of rainfall per day is around 23 mm, which is considered light rain.May is a pretty wet month with over 30 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how May is compared with other months in the amount of precipitation, total mm:
Sao Luis wettest month is March, where a typical day has a 97% chance of precipitation and 437 mm of rainfall per day. September, on the other hand, is the driest month with a mere 43% chance of precipitation and 13 mm of rainfall per day.
How was the weather last May in Sao Luis?
This is the weather in Sao Luis in May 2025:
1 May
🌧️
+85°F
2 May
🌧️
+85°F
3 May
🌧️
+85°F
4 May
🌧️
+86°F
5 May
☀️
+87°F
6 May
☀️
+87°F
7 May
☀️
+89°F
8 May
🌧️
+86°F
9 May
☀️
+87°F
10 May
☀️
+85°F
11 May
☀️
+85°F
12 May
☀️
+86°F
13 May
🌧️
+84°F
14 May
🌧️
+88°F
15 May
🌧️
+86°F
16 May
🌧️
+85°F
17 May
🌧️
+83°F
18 May
🌧️
+87°F
19 May
🌧️
+83°F
20 May
🌧️
+86°F
21 May
🌧️
+85°F
22 May
🌧️
+89°F
23 May
☁️
+88°F
24 May
🌧️
+83°F
25 May
🌧️
+86°F
26 May
🌧️
+86°F
27 May
🌧️
+84°F
28 May
🌧️
+86°F
29 May
🌧️
+86°F
30 May
🌧️
+85°F
31 May
🌧️
+87°F
In May 2025 Sao Luis had 7 sunny days, 1 cloudy days, and 23 rainy days. The average maximum temperature was +86°F, with an absolute maximum of +90°F and a minimum of +82°F. The average humidity was 87%, with a maximum of 100% and a minimum of 62%. The average wind speed was 3 m/s, with a maximum of 8 m/s and a minimum of 0 m/s.
Are you planning a trip in May?
Climate Change Over the Years
This is how Sao Luis climate has changed over the last 43 years.
The climate in Sao Luis in May 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
Frequently asked questions about the weather in Sao Luis in May:
Is May a good time to visit Sao Luis?
It’s always a good time to visit Sao Luis, but the weather is changeable in May, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Sao Luis in May?
May is warm in Sao Luis. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Sao Luis rainy in May?
Sao Luis is often rainy in May. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Sao Luis in May?
Usually, it’s not very sunny in Sao Luis in May, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
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.
