AI-generatedSão Luís at a glance
- Best time
- Sep – Nov
- Warmest month
- Sep · 33°
- Warmest sea
- May · 28.9°
- Sunshine a year
- 2,450 h
- Rain a year
- 1,866 mm
- Climate
- Tropical
- Time zone
- UTC−3
- Elevation
- 29 m
Climate in São Luís
São Luís has a tropical climate: it is warm all year round, and the seasons differ mainly in how much rain falls. September is the warmest month with average highs of 33 °C, while February is the coolest at 29 °C. With around 2,450 hours of sunshine a year, São Luís is sunny; August is the sunniest month with 8.3 hours a day.
Holiday weather through the year
Best time to visit São Luís
The best time to visit São Luís is from September to November. For a beach holiday – sea from 21 °C, warm and mostly dry – go from August to November. The rainy season is from February to May; the wettest month is March with 401 mm.
São Luís through the seasons
How the weather changes over the seasons, with averages for each.
São Luís in the dry season
Jun – Jan
Fair
- 30–33 °C by day
- Sea 28 °C
- 7.5 h of sun a day
- 95 rainy days in all
São Luís in the rainy season
Feb – May
Poor
- 29–31 °C by day
- Sea 29 °C
- 5.1 h of sun a day
- 112 rainy days in all
Which month for what?
Beach & swimming
Aug – Nov
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
No month
15–28 °C and not too much rain
Rainy months
Feb – May
Rainy season or more than 12 rainy days
Find your perfect month
Tell us what you like and we rate every month in São Luís for you.
Your best months: September – November
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Good
Best time to visit: September – November
Where to go in OctoberSea temperature in October
Good forBeach & swimming
A typical day in October
- Morning, 08:00: about 28°
- Midday, 13:00: about 32°
- Afternoon, 16:00: about 32°
- Evening, 20:00: about 28°
- Night, 23:00: about 27°
05:3817:48
Warm enough for a T-shirt in the evening.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 05:25–06:06 · evening 17:20–18:00
- Blue hour
- Morning 05:17–05:25 · evening 18:00–18:09
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in São Luís compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs stay at about 32° from start to end.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 32° | 32° |
| Night-time low | 25° | 25° |
| Sea | 28° | 28° |
| Daylight | 12.1 h | 12.2 h |
What is the weather like in São Luís in October?
In October, São Luís is hot: daytime highs average 32 °C, and even at night it stays warm at around 25 °C. The sea averages 27.7 °C – lovely and warm for swimming. The sun shines for around 8.0 hours a day. Rain is rare: about 3 days bring 13 mm in total. The thermometer climbs to 30 °C or more every day. The air is often humid and muggy. All in all, October is a good month for a holiday in São Luís.
More details for October
- Daylight
- 12 h 10 min05:38 – 17:48
- UV index
- 14 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 43 %on averageAll months
- Hot days
- 31 days30 °C or moreAll months
- Time zone
- UTC−3offset from UTC
How the score comes together
- Temperatureweight 50 %33 %
- Sunshineweight 20 %83 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
Compare two months in São Luís
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
October and September bring similar holiday weather to São Luís (score 63 and 62). In September, days are 1 °C warmer than in October. The sea is about as warm in both months.
| Month | October | September |
|---|---|---|
| Holiday weather score | 63 | 62 |
| Daytime high | 32° | 33° |
| Night-time low | 25° | 25° |
| Sea | 27.7° | 27.8° |
| Sunshine | 8.0 h | 8.2 h |
| Rainy days | 3 | 3 |
| Rainfall | 13 mm | 12 mm |
| Muggy days | 31 | 30better |
Based on the climate averages 1996–2025.
São Luís month by month
The typical weather for every month at a glance.
41January30° · Sea 28° · 5.8 h
In January, São Luís is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 28.2 °C – lovely and warm for swimming. Expect around 5.8 hours of sunshine a day. It rains often – on about 25 days, adding up to 193 mm. On about 15 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, January is a so-so month for a holiday in São Luís.
São Luís in January42February29° · Sea 29° · 5.0 h
In February, São Luís is hot: daytime highs average 29 °C, and even at night it stays warm at around 24 °C. The sea averages 28.5 °C – lovely and warm for swimming. Expect around 5.0 hours of sunshine a day. It is the rainy season: rain falls on about 26 days, totalling 269 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, February is a so-so month for a holiday in São Luís.
São Luís in February39March30° · Sea 29° · 4.4 h
In March, São Luís is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. The sea averages 28.6 °C – lovely and warm for swimming. Expect around 4.4 hours of sunshine a day. It is the rainy season: rain falls on about 30 days, totalling 401 mm. On about 10 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, March is not an ideal month for a holiday in São Luís.
São Luís in March38April30° · Sea 29° · 4.7 h
In April, São Luís is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. The sea averages 28.8 °C – lovely and warm for swimming. Expect around 4.7 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 394 mm. On about 15 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, April is not an ideal month for a holiday in São Luís.
São Luís in April38May31° · Sea 29° · 6.1 h
In May, São Luís is hot: daytime highs average 31 °C, and even at night it stays warm at around 25 °C. The sea averages 28.9 °C – lovely and warm for swimming. Expect around 6.1 hours of sunshine a day. It is the rainy season: rain falls on about 26 days, totalling 257 mm. On about 23 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is not an ideal month for a holiday in São Luís.
São Luís in May41June31° · Sea 29° · 7.2 h
In June, São Luís is hot: daytime highs average 31 °C, and even at night it stays warm at around 24 °C. The sea averages 28.9 °C – lovely and warm for swimming. The sun shines for around 7.2 hours a day. It rains often – on about 21 days, adding up to 131 mm. On about 23 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, June is a so-so month for a holiday in São Luís.
São Luís in June41July31° · Sea 29° · 7.7 h
In July, São Luís is hot: daytime highs average 31 °C, and even at night it stays warm at around 24 °C. The sea averages 28.6 °C – lovely and warm for swimming. The sun shines for around 7.7 hours a day. It rains often – on about 18 days, adding up to 84 mm. On about 27 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is a so-so month for a holiday in São Luís.
São Luís in July58August32° · Sea 28° · 8.3 h
In August, São Luís is hot: daytime highs average 32 °C, and even at night it stays warm at around 25 °C. The sea averages 28.3 °C – lovely and warm for swimming. The sun shines for around 8.3 hours a day. Rain falls on about 7 days, adding up to 25 mm. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a so-so month for a holiday in São Luís.
São Luís in August62September33° · Sea 28° · 8.2 h
In September, São Luís is hot: daytime highs average 33 °C, and even at night it stays warm at around 25 °C. The sea averages 27.8 °C – lovely and warm for swimming. The sun shines for around 8.2 hours a day. Rain is rare: about 3 days bring 12 mm in total. The thermometer climbs to 30 °C or more every day. The air is often humid and muggy. All in all, September is a good month for a holiday in São Luís.
São Luís in September63October32° · Sea 28° · 8.0 h
In October, São Luís is hot: daytime highs average 32 °C, and even at night it stays warm at around 25 °C. The sea averages 27.7 °C – lovely and warm for swimming. The sun shines for around 8.0 hours a day. Rain is rare: about 3 days bring 13 mm in total. The thermometer climbs to 30 °C or more every day. The air is often humid and muggy. All in all, October is a good month for a holiday in São Luís.
São Luís in October62November32° · Sea 28° · 7.8 h
In November, São Luís is hot: daytime highs average 32 °C, and even at night it stays warm at around 25 °C. The sea averages 27.9 °C – lovely and warm for swimming. The sun shines for around 7.8 hours a day. Rain falls on about 5 days, adding up to 23 mm. The thermometer climbs to 30 °C or more every day. The air is often humid and muggy. All in all, November is a good month for a holiday in São Luís.
São Luís in November45December31° · Sea 28° · 7.2 h
In December, São Luís is hot: daytime highs average 31 °C, and even at night it stays warm at around 25 °C. The sea averages 28.1 °C – lovely and warm for swimming. The sun shines for around 7.2 hours a day. Rain is frequent, with about 14 rainy days and 64 mm in total. On about 27 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is a so-so month for a holiday in São Luís.
São Luís in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in São Luís
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Hot 24° and more
- muggy month (15+ muggy days)
HotOctober: nights around 25°. Hot nights: air conditioning makes sleeping much easier. Muggy on about 31 days (dew point 18 °C or more).
The coolest nights are in February (24°), the warmest in November (25°). Nights stay tropical all year (20 °C and more), so a room with air conditioning or at least a fan pays off. It is muggy (dew point 18 °C or more) all year, on about 365 days a year.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 41 | 30° | 25° | 28.2° | 5.8 h | 25 | 193 |
| FebruaryFeb | 42 | 29° | 24° | 28.5° | 5.0 h | 26 | 269 |
| MarchMar | 39 | 30° | 24° | 28.6° | 4.4 h | 30 | 401 |
| AprilApr | 38 | 30° | 24° | 28.8° | 4.7 h | 29 | 394 |
| MayMay | 38 | 31° | 25° | 28.9° | 6.1 h | 26 | 257 |
| JuneJun | 41 | 31° | 24° | 28.9° | 7.2 h | 21 | 131 |
| JulyJul | 41 | 31° | 24° | 28.6° | 7.7 h | 18 | 84 |
| AugustAug | 58 | 32° | 25° | 28.3° | 8.3 h | 7 | 25 |
| SeptemberSep | 62 | 33° | 25° | 27.8° | 8.2 h | 3 | 12 |
| OctoberOct | 63 | 32° | 25° | 27.7° | 8.0 h | 3 | 13 |
| NovemberNov | 62 | 32° | 25° | 27.9° | 7.8 h | 5 | 23 |
| DecemberDec | 45 | 31° | 25° | 28.1° | 7.2 h | 14 | 64 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
2.53° S, 44.30° W · 29 m · America/Fortaleza
Sea temperature in São Luís
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 27.2 – 28.2 °C
Swimming season: all year
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in São Luís ranges from 27.7 °C in October to 28.9 °C in May. At 20 °C and more, the sea is warm enough for swimming all year round.
The sea temperature varies from year to year: in May, eight out of ten years were between 28.5 and 29.3 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 28.2° | 27.9° | 28.6° | warm |
| FebruaryFeb | 28.5° | 28.2° | 28.8° | warm |
| MarchMar | 28.6° | 28.2° | 29.0° | warm |
| AprilApr | 28.8° | 28.4° | 29.2° | warm |
| MayMay | 28.9° | 28.5° | 29.3° | warm |
| JuneJun | 28.9° | 28.6° | 29.2° | warm |
| JulyJul | 28.6° | 28.1° | 29.1° | warm |
| AugustAug | 28.3° | 27.9° | 28.9° | warm |
| SeptemberSep | 27.8° | 27.4° | 28.2° | warm |
| OctoberOct | 27.7° | 27.2° | 28.2° | warm |
| NovemberNov | 27.9° | 27.6° | 28.5° | warm |
| DecemberDec | 28.1° | 27.6° | 28.5° | warm |
Sunshine hours in São Luís
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 8.0 of 12.2 hours of daylight in São Luís, 66 % of the daylight hours.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
Rain in São Luís: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, São Luís has about 3 rainy days with 13 mm of rain in total.
UV index in São Luís
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 14 · extremeAvoid the midday sun; SPF 50+, covering clothes, hat and sunglasses.
The sun is strongest in March (UV 14).
Minutes until sunburn in October
- Very fair skin
- about 10 min
- Fair skin
- about 10 min
- Light brown skin
- about 15 min
- Olive skin
- about 20 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind and clouds in São Luís
How breezy and how cloudy São Luís is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in São Luís typically peaks at 22 km/h during the day: Beaufort 4, moderate breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting: Sep – Dec.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 43 % of the sky over São Luís: mostly sunny, with about 8.0 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in São Luís
How often the day gets hot in São Luís (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, it is hot in São Luís every day, with an average daytime high of 32 °C: hot and muggy. Plan outdoor activities for the morning and evening, drink a lot and take breaks in the cool.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Planning a trip to São Luís
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
São Luís in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
São Luís has its best school-holiday weather during October half-term (score 63) and its weakest during the Easter holidays (score 38).
- 38
Easter holidays
Mar – Apr
Poor
- 30 °C by day
- Sea 29 °C
- 4.6 h of sun a day
- 29 rainy days a month
Keep in mind: Frequent rain
- 39
May half-term
May – Jun
Poor
- 31 °C by day
- Sea 29 °C
- 6.3 h of sun a day
- 25 rainy days a month
Keep in mind: Frequent rain
- 52
Summer holidays
Jul – Aug
Fair
- 32 °C by day
- Sea 28 °C
- 8.1 h of sun a day
- 11 rainy days a month
- 63
October half-term
Oct
GoodBest holidays
- 32 °C by day
- Sea 28 °C
- 8.0 h of sun a day
- 3 rainy days a month
Good for: Beach & swimming
- 43
Christmas holidays
Dec – Jan
Fair
- 31 °C by day
- Sea 28 °C
- 6.5 h of sun a day
- 19 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 9 h 15 min
- Distance
- 7,290 km
- Time zone
- UTC−3
- Jet lag
- About 3 days (4 h west)
Rule of thumb for flying west: for a few days before, stay up a little later, and get afternoon and evening light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Compare & alternatives
São Luís compared
Put São Luís side by side with another destination.
São Luís vs Belém
In October São Luís has the better holiday weather (score 63 vs 52). During the day Belém is 1 °C warmer than São Luís. The sea in Belém is 1 °C warmer.
| in October | São Luís | Belém |
|---|---|---|
| Holiday weather score | 63 | 52 |
| Daytime high | 32° | 33° |
| Sea | 28° | 29° |
| Sunshine | 8 h | 8 h |
| Rainy days | 3 | 7 |
| Best time | Sep – Nov | Aug – Oct |
Through the year
Brazil in October: the best places
In October, São Luís ranks 9 among the 31 nearest destinations in this country.
- Natal30°27°90
- 2Rio de Janeiro29°22°71
- 3Ipanema29°22°71
- 4Fortaleza32°27°69
- 5Aracaju29°26°68
- 6João Pessoa30°27°65
- 7Belo Horizonte29°65
- 8Angra dos Reis25°23°65
- 9São LuísThis page32°28°63
Near São Luís
Other destinations close by.
Places with a climate like São Luís
Destinations whose weather through the year is closest to São Luís's – good alternatives.
Frequently asked questions about São Luís
When is the best time to visit São Luís?
The best time to visit São Luís is from September to November. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in São Luís?
The sea temperature in São Luís ranges from 27.7 °C in October to 28.9 °C in May. At 20 °C and more, the sea is warm enough for swimming all year round.
Can you swim in São Luís in October?
Yes. In October the sea averages 27.7 °C – lovely and warm for swimming.
What is the warmest month in São Luís?
September is the warmest month, with average highs of 33 °C and nights around 25 °C. February is the coolest month at 29 °C.
When does it rain most in São Luís?
The rainy season is from February to May; the wettest month is March with 401 mm. The driest month is September with 12 mm.
How many hours of sunshine does São Luís get?
São Luís gets around 2,450 hours of sunshine a year. The sunniest month is August with 8.3 hours a day; in March there are 4.4 hours a day.
What time zone is São Luís in?
São Luís is on UTC−3 all year.
How long is the flight from London to São Luís?
A nonstop flight from London to São Luís takes about 9 h 15 min, for a straight-line distance of about 7,290 km.
Which school holidays are best for São Luís?
São Luís has its best school-holiday weather during October half-term (score 63) and its weakest during the Easter holidays (score 38). Holiday ratings (0–100): Easter holidays 38, May half-term 39, summer holidays 52, October half-term 63, Christmas holidays 43.