São Luís in Spring
In spring (September, October and November), São Luís sees average daytime highs around 29°C and overnight lows near 26°C, with 51 mm of rain over about 14 wet days across the season. It is the 2nd-warmest season and the driest season of the year.
Across spring, daytime highs hold fairly steady around 29°C. The sky is clear or mostly clear about 63% of the time across spring, and the air most often feels oppressive.
Spring is São Luís's best season of the year to visit on our travel score. São Luís has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see São Luís's year-round climate.
- Avg daytime high
- 29°C
- 2nd-warmest season
- Avg overnight low
- 26°C
- Rainfall
- 51 mm
- 14 wet days
- Avg wind
- 22 km/h
- Travel score
- 6.7
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in São Luís in Spring
Across spring, daytime highs hold fairly steady around 29°C.
A typical spring day in São Luís reaches about 29°C and drops to 26°C overnight. The warmest of the three months is September, the coolest September.
How spring really feels in São Luís
Once humidity and wind are folded in, spring brings about 4 days that feel above 32°C and 0 that feel at or below 0°C.
The story in spring is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
São Luís weather by month
How the three spring months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 28° / 25° | 221 | 25.4 | 12.1 | 4.0 |
| Feb | 28° / 25° | 303 | 26 | 12.1 | 3.6 |
| Mar | 27° / 25° | 440 | 30.3 | 12 | 3.4 |
| Apr | 28° / 25° | 414 | 28.8 | 11.9 | 3.4 |
| May | 28° / 26° | 286 | 26.9 | 11.9 | 3.7 |
| Jun | 28° / 26° | 153 | 23 | 11.9 | 4.2 |
| Jul | 29° / 26° | 103 | 20 | 11.9 | 4.7 |
| Aug | 29° / 26° | 28 | 9 | 11.9 | 6.1 |
| Sep | 29° / 26° | 11 | 3.2 | 12 | 7.0 |
| Oct | 28° / 26° | 13 | 3.6 | 12.1 | 6.9 |
| Nov | 29° / 26° | 27 | 6.8 | 12.1 | 6.3 |
| Dec | 28° / 26° | 73 | 15.3 | 12.1 | 5.2 |
Cloud cover in Spring
The sky is clear or mostly clear about 63% of the time across spring.
Chance of precipitation in Spring
São Luís gets around 51 mm of rain over 14 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 22 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 12 hours in early September to 12 h 06 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 6.3 kWh/m².
Hazard calendar for São Luís
None of São Luís's seasonal hazards peak in spring. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
São Luís's monsoon runs January–May, when most of the year's rain falls.
Is spring a good time to visit São Luís?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit São Luís for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for São Luís in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, São Luís sees daytime highs around 29°C and nights near 26°C. Pack light clothes and sun protection. Worth having: a windbreaker. About 14 days see rain.
Sea temperature near São Luís in Spring
The nearest coast averages about 28°C across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 km away) is warmest in May at about 29°C and coldest in October near 28°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Tropical |
| Feb | 28 | Tropical |
| Mar | 28 | Tropical |
| Apr | 29 | Tropical |
| May | 29 | Tropical |
| Jun | 29 | Tropical |
| Jul | 28 | Tropical |
| Aug | 28 | Tropical |
| Sep | 28 | Warm |
| Oct | 28 | Warm |
| Nov | 28 | Warm |
| Dec | 28 | Warm |
UV index in São Luís in Spring
Clear-sky midday UV across spring averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in São Luís peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 17 at about 10 (extreme).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 13 | 14 | 16 | 14 | 12 | 10 | 10 | 10 | 12 | 12 | 11 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 14 | Extreme |
| Mar | 16 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 10 | Extreme |
| Jul | 10 | Very high |
| Aug | 10 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 11 | Extreme |
Air quality in São Luís in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in São Luís is worst in February — around 18 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (July, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 18 | 18 | 13 | 8 | 7 | 7 | 8 | 9 | 10 | 10 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 18 | Moderate |
| Mar | 18 | Moderate |
| Apr | 13 | Moderate |
| May | 8 | Good |
| Jun | 7 | Good |
| Jul | 7 | Good |
| Aug | 8 | Good |
| Sep | 9 | Good |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 11 | Good |
Where is São Luís?
São Luís sits at 2.5°S, 44.3°W, 29 m above sea level, in Brazil. The nearest listed city is Alcântara, 19 km away.
Topography around São Luís
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Luís.
Within 3 km, the terrain around São Luís has only modest variations in elevation — a maximum elevation change of 37 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 65 m; within 80 km, only modest variations in elevation — a maximum elevation change of 102 m.
The land around São Luís is covered by artificial surfaces (38%) and water (33%) within 3 km, water (52%) and trees (20%) within 16 km, and water (36%) and trees (35%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for São Luís (-2.5297°, -44.3028°, elevation 29 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.