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Weather in São Luís - 14-day forecast

Detailed weather forecast for São Luís, Brazil: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in São Luís
today🌧️ 30°💧 0.1 mm
Sun☀️ 29°💧 0.3 mm
Mon🌤️ 29°💧 0.2 mm
Tue🌧️ 30°💧 0.5 mm
Wed🌧️ 30°💧 0.3 mm
Thu🌧️ 29°💧 0.8 mm
Fri🌧️ 29°💧 0.6 mm
Sat🌧️ 29°💧 0.1 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Sunday 6 Sept in São Luís, the forecast high is 29°C. Typical daytime temperatures at this time of year range from 31°C to 33°C, so it will be exceptionally cool. It is cooler than 99% of similar days.

30°Cexceptionally cool
usually 31°C–33°C
cooler than 98% of similar days
night: exceptionally warm rain: more rain than usual wind: exceptionally strong
29°Cexceptionally cool
usually 31°C–33°C
cooler than 99% of similar days
night: exceptionally warm rain: more rain than usual wind: exceptionally strong
29°Cexceptionally cool
usually 31°C–33°C
cooler than 99% of similar days
night: exceptionally warm rain: more rain than usual wind: exceptionally strong
30°Cexceptionally cool
usually 31°C–33°C
cooler than 98% of similar days
night: exceptionally warm rain: more rain than usual wind: exceptionally strong
30°Cexceptionally cool
usually 31°C–33°C
cooler than 97% of similar days
night: exceptionally warm rain: more rain than usual wind: exceptionally strong
29°Cexceptionally cool
usually 31°C–33°C
cooler than 98% of similar days
night: exceptionally warm rain: more rain than usual wind: exceptionally strong
29°Cexceptionally cool
usually 31°C–33°C
cooler than 99% of similar days
night: exceptionally warm rain: more rain than usual wind: exceptionally strong

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
25°33°40° 1981: 32°C1982: 31°C1983: 31°C1984: 30°C1985: 31°C1986: 30°C1987: 32°C1988: 31°C1989: 30°C1990: 31°C1991: 32°C1992: 31°C1993: 32°C1994: 31°C1995: 32°C1996: 32°C1997: 31°C1998: 32°C1999: 32°C2000: 30°C2001: 32°C2002: 32°C2003: 33°C2004: 32°C2005: 32°C2006: 31°C2007: 33°C2008: 32°C2009: 32°C2010: 33°C2011: 32°C2012: 33°C2013: 32°C2014: 33°C2015: 32°C2016: 33°C2017: 33°C2018: 32°C2019: 33°C2020: 33°C2021: 32°C2022: 33°C2023: 33°C2024: 34°C2025: 34°C 2026 forecast: 29°C current forecast 29°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 32°C by day. The coolest year was 2000 (30°C) and the warmest was 2024 (34°C). The current forecast averages 29°C - lower than in 100% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - São Luís

São Luís - 14-day weather forecast infographic

São Luís 30 & 45-day weather - long-range outlook

Next 15 days · forecast
30°
around 27° at night · days with rain: 0
Weeks 3-4 · avg for September
32°
around 26° at night · rain chance 3%
Weeks 5-7 · avg for October
32°
around 26° at night · rain chance 2%
The 30 & 45-day outlook for São Luís: the next 15 days are a numerical forecast updated daily - on average 30° by day and 27° at night. Further out we rely on multi-year climate averages: around 32° in September, and about 32° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for São Luís

Saturday5 September 2026
🌧️30°light rain
sunrise 05:54 · sunset 17:58 · night 26° · evening 29° · rain 0.12 mm · humidity 73% · wind 8 m/s · clouds 98%
Sunday6 September 2026
☀️29°clear sky
sunrise 05:53 · sunset 17:58 · night 27° · evening 28° · rain 0.29 mm · humidity 65% · wind 9 m/s · clouds 10%
Monday7 September 2026
🌤️29°a few clouds
sunrise 05:53 · sunset 17:57 · night 27° · evening 28° · rain 0.24 mm · humidity 64% · wind 10 m/s · clouds 14%
Tuesday8 September 2026
🌧️30°light rain
sunrise 05:53 · sunset 17:57 · night 27° · evening 27° · rain 0.47 mm · humidity 66% · wind 9 m/s · clouds 65%
Wednesday9 September 2026
🌧️30°light rain
sunrise 05:52 · sunset 17:57 · night 27° · evening 27° · rain 0.27 mm · humidity 60% · wind 9 m/s · clouds 20%
Thursday10 September 2026
🌧️29°light rain
sunrise 05:52 · sunset 17:57 · night 27° · evening 27° · rain 0.78 mm · humidity 69% · wind 9 m/s · clouds 83%
Friday11 September 2026
🌧️29°light rain
sunrise 05:51 · sunset 17:56 · night 27° · evening 27° · rain 0.6 mm · humidity 69% · wind 9 m/s · clouds 86%
Saturday12 September 2026
🌧️29°light rain
sunrise 05:51 · sunset 17:56 · night 27° · evening 27° · rain 0.12 mm · humidity 66% · wind 9 m/s · clouds 96%
Sunday13 September 2026
🌧️28°light rain
sunrise 05:51 · sunset 17:56 · night 27° · evening 27° · rain 0.12 mm · humidity 74% · wind 10 m/s · clouds 82%
Monday14 September 2026
🌤️29°a few clouds
sunrise 05:50 · sunset 17:55 · night 26° · evening 27° · rain 0.99 mm · humidity 65% · wind 9 m/s · clouds 15%
Tuesday15 September 2026
🌧️30°light rain
sunrise 05:50 · sunset 17:55 · night 27° · evening 27° · rain 0.24 mm · humidity 63% · wind 9 m/s · clouds 41%
Wednesday16 September 2026
🌧️31°light rain
sunrise 05:49 · sunset 17:55 · night 26° · evening 27° · rain 0.81 mm · humidity 59% · wind 9 m/s · clouds 17%
Thursday17 September 2026
🌧️30°light rain
sunrise 05:49 · sunset 17:55 · night 27° · evening 27° · rain 0.66 mm · humidity 62% · wind 9 m/s · clouds 80%
Friday18 September 2026
🌧️30°light rain
sunrise 05:48 · sunset 17:54 · night 27° · evening 27° · rain 0.42 mm · humidity 59% · wind 9 m/s · clouds 14%
Saturday19 September 2026
🌧️31°light rain
sunrise 05:48 · sunset 17:54 · night 27° · evening 27° · rain 0.15 mm · humidity 57% · wind 10 m/s · clouds 17%

UV index in São Luís - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTSão Luís03681111+8.7UV VERY HIGHtoday, daily maxSPF 50, long sleeves and shade between 10:00 and16:00.Unprotected fair skin may burn in about 25 min9Sat5.099Sun6.099Mon7.098Tue8.099Wed9.099Thu10.098Fri11.098Sat12.099Sun13.099Mon14.099Tue15.099Wed16.099Thu17.099Fri18.099Sat19.098Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in São Luís is 9 (very high) - unprotected fair skin can burn in about 25 minutes. SPF 50, long sleeves and shade between 10:00 and 16:00.

Sea temperature - São Luís

Water today
29°C
Week avg
29°C
How's the water?
very warm
16-day sea temperature forecast:
5.09 29°C6.09 29°C7.09 29°C8.09 29°C9.09 29°C10.09 29°C11.09 29°C12.09 29°C13.09 29°C
Average sea temperature through the year:
Jan 30°CFeb 30°CMar 30°CApr 30°CMay 31°CJun 30°CJul 30°CAug 30°CSep 29°COct 29°CNov 29°CDec 29°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

São Luís weather through the year

São Luís - annual climate
Upcoming public holidays in Brazil: Independence Day — 7 September · Our Lady of Aparecida — 12 October · All Souls' Day — 2 November.

Nearby and related places

TeresinaBelémSão PauloRio de JaneiroManausGoiânia

FAQ - São Luís weather

What is the weather like in São Luís today?
Today it is about 30° during the day and 26° at night, light rain.
How far ahead can I check the forecast for São Luís?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.