1. WeatherSpark.com
  2. Brazil
  3. Maranhão
  4. São Luís

Fall Weather in São Luís Brazil

Daily high temperatures are around 87°F, rarely falling below 83°F or exceeding 91°F. The lowest daily average high temperature is 86°F on March 19.

Daily low temperatures are around 77°F, rarely falling below 74°F or exceeding 79°F. The highest daily average low temperature is 77°F on May 28.

For reference, on October 22, the hottest day of the year, temperatures in São Luís typically range from 79°F to 90°F, while on April 4, the coldest day of the year, they range from 77°F to 87°F.

Average High and Low Temperature in the Fall in São Luís

Average High and Low Temperature in the Fall in São LuísMarAprMay75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°FSummerWinterMar 1786°FMar 1786°F77°F77°FMar 187°FMar 187°F77°F77°FMay 3188°FMay 3188°F77°F77°FApr 187°FApr 187°F77°F77°FMay 187°FMay 187°F77°F77°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average fall temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in the Fall in São Luís

Average Hourly Temperature in the Fall in São LuísMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWinterNowNowwarmwarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Kampung Kok, Malaysia (9,953 miles away) and Singapore (10,247 miles) are the far-away foreign places with temperatures most similar to São Luís (view comparison).

Map
Marker
© OpenStreetMap contributors

Compare São Luís to another city:

Map

The fall in São Luís experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 77% to 66%. The highest chance of overcast or mostly cloudy conditions is 85% on April 24.

The clearest day of the fall is May 31, with clear, mostly clear, or partly cloudy conditions 34% of the time.

For reference, on April 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 85%, while on August 11, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.

Cloud Cover Categories in the Fall in São Luís

Cloud Cover Categories in the Fall in São LuísMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterAug 1168%Aug 1168%Mar 123%Mar 123%May 3134%May 3134%Apr 116%Apr 116%May 117%May 117%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In São Luís, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 76% and ending it at 60%.

For reference, the year's highest daily chance of a wet day is 86% on April 7, and its lowest chance is 4% on October 31.

Probability of Precipitation in the Fall in São Luís

Probability of Precipitation in the Fall in São LuísMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%SummerWinterApr 786%Apr 786%Mar 176%Mar 176%May 3160%May 3160%May 180%May 180%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in São Luís is very rapidly decreasing, starting the season at 11.1 inches, when it rarely exceeds 17.2 inches or falls below 4.5 inches, and ending the season at 6.6 inches, when it rarely exceeds 11.4 inches or falls below 2.2 inches.

The highest average 31-day accumulation is 13.9 inches on April 10.

Average Monthly Rainfall in the Fall in São Luís

Average Monthly Rainfall in the Fall in São LuísMarAprMay0 in0 in5 in5 in10 in10 in15 in15 in20 in20 inSummerWinterApr 1013.9 inApr 1013.9 inMar 111.1 inMar 111.1 inMay 316.6 inMay 316.6 inMay 112.2 inMay 112.2 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the fall in São Luís, the length of the day is essentially constant. The shortest day of the fall is May 31, with 11 hours, 59 minutes of daylight and the longest day is March 1, with 12 hours, 9 minutes of daylight.

Hours of Daylight and Twilight in the Fall in São Luís

Hours of Daylight and Twilight in the Fall in São LuísMarAprMay0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterMar 2012 hr, 7 minMar 2012 hr, 7 mindaydaydaydaynightMay 3111 hr, 59 minMay 3111 hr, 59 minMay 112 hr, 1 minMay 112 hr, 1 minNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the fall in São Luís is 6:04 AM on March 1 and the earliest sunrise is 12 minutes earlier at 5:53 AM on May 10.

The latest sunset is 6:14 PM on March 1 and the earliest sunset is 21 minutes earlier at 5:53 PM on May 17.

Daylight saving time is not observed in São Luís during 2023.

For reference, on December 22, the longest day of the year, the Sun rises at 5:47 AM and sets 12 hours, 16 minutes later, at 6:03 PM, while on June 21, the shortest day of the year, it rises at 5:59 AM and sets 11 hours, 59 minutes later, at 5:58 PM.

Sunrise & Sunset with Twilight in the Fall in São Luís

Sunrise & Sunset with Twilight in the Fall in São LuísMarAprMay12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter5:53 AM5:53 AMMay 105:53 PMMay 105:53 PM6:04 AM6:04 AMMar 16:14 PMMar 16:14 PM5:55 AM5:55 AMMay 315:54 PMMay 315:54 PM5:58 AM5:58 AMApr 16:03 PMApr 16:03 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the fall. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in the Fall in São Luís

Solar Elevation and Azimuth in the Fall in São LuísMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWinter00102020303040505060607080001010203030404050606070NowNow
northeastsouthwest
Solar elevation and azimuth in the the fall of 2023. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the fall of 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Fall in São Luís

Moon Rise, Set & Phases in the Fall in São LuísMarAprMay12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterFeb 53:29 PMFeb 53:29 PMFeb 204:06 AMFeb 204:06 AMMar 79:41 AMMar 79:41 AMMar 212:24 PMMar 212:24 PMApr 61:35 AMApr 61:35 AMApr 201:13 AMApr 201:13 AMMay 52:35 PMMay 52:35 PMMay 1912:54 PMMay 1912:54 PMJun 412:42 AMJun 412:42 AMJun 181:38 AMJun 181:38 AM6:26 PM6:26 PM6:41 AM6:41 AM5:49 PM5:49 PM6:06 AM6:06 AM5:51 AM5:51 AM5:48 PM5:48 PM6:11 AM6:11 AM6:08 AM6:08 AM5:56 PM5:56 PM6:29 AM6:29 AM5:31 PM5:31 PM6:12 AM6:12 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in São Luís is essentially constant during the fall, remaining around 100% throughout.

For reference, on February 21, the muggiest day of the year, there are muggy conditions 100% of the time, while on August 28, the least muggy day of the year, there are muggy conditions 99% of the time.

Humidity Comfort Levels in the Fall in São Luís

Humidity Comfort Levels in the Fall in São LuísMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterMar 1100%Mar 1100%May 31100%May 31100%Apr 1100%Apr 1100%May 1100%May 1100%NowNowmiserablemiserableoppressiveoppressivemuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in São Luís is gradually decreasing during the fall, decreasing from 5.2 miles per hour to 4.5 miles per hour over the course of the season.

For reference, on October 25, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on May 4, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.

The lowest daily average wind speed during the fall is 4.3 miles per hour on May 5.

Average Wind Speed in the Fall in São Luís

Average Wind Speed in the Fall in São LuísMarAprMay0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mphSummerWinterMay 54.3 mphMay 54.3 mphMar 15.2 mphMar 15.2 mphMay 314.5 mphMay 314.5 mphApr 14.7 mphApr 14.7 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in São Luís during the fall is predominantly out of the north from March 1 to April 23 and the east from April 23 to May 31.

Wind Direction in the Fall in São Luís

Wind Direction in the Fall in São LuísENEMarAprMay0%100%20%80%40%60%60%40%80%20%100%0%SummerWinterNowNoweastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

São Luís is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in São Luís is essentially constant during the fall, remaining around 83°F throughout.

The highest average surface water temperature during the fall is 84°F on May 23.

Average Water Temperature in the Fall in São Luís

Average Water Temperature in the Fall in São LuísMarAprMay81.0°F81.0°F81.5°F81.5°F82.0°F82.0°F82.5°F82.5°F83.0°F83.0°F83.5°F83.5°F84.0°F84.0°F84.5°F84.5°F85.0°F85.0°FSummerWinterMay 2384°FMay 2384°FMar 183°FMar 183°FApr 183°FApr 183°FMay 183°FMay 183°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in São Luís are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in the Fall in São Luís

Time Spent in Various Temperature Bands and the Growing Season in the Fall in São LuísMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinter100%Apr 16100%Apr 16NowNowwarmhotcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in São Luís are very rapidly increasing during the fall, increasing by 2,772°F, from 7,726°F to 10,498°F, over the course of the season.

Growing Degree Days in the Fall in São Luís

Growing Degree Days in the Fall in São LuísMarAprMay8,000°F8,000°F8,500°F8,500°F9,000°F9,000°F9,500°F9,500°F10,000°F10,000°F10,500°F10,500°FSummerWinterMar 17,726°FMar 17,726°FMay 3110,498°FMay 3110,498°FApr 18,662°FApr 18,662°FMay 19,569°FMay 19,569°FNowNow
The average growing degree days accumulated over the course of the fall, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in São Luís is essentially constant during the fall, remaining within 0.3 kWh of 4.3 kWh throughout.

The lowest average daily incident shortwave solar energy during the fall is 3.9 kWh on April 24.

Average Daily Incident Shortwave Solar Energy in the Fall in São Luís

Average Daily Incident Shortwave Solar Energy in the Fall in São LuísMarAprMay0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhSummerWinterApr 243.9 kWhApr 243.9 kWhMar 14.6 kWhMar 14.6 kWhMay 314.6 kWhMay 314.6 kWhApr 14.0 kWhApr 14.0 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of São Luís are -2.530 deg latitude, -44.303 deg longitude, and 95 ft elevation.

The topography within 2 miles of São Luís contains only modest variations in elevation, with a maximum elevation change of 151 feet and an average elevation above sea level of 25 feet. Within 10 miles also contains only modest variations in elevation (243 feet). Within 50 miles also contains only modest variations in elevation (440 feet).

The area within 2 miles of São Luís is covered by artificial surfaces (45%), water (35%), and shrubs (11%), within 10 miles by water (69%), and within 50 miles by water (51%) and trees (17%).

This report illustrates the typical weather in São Luís, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There is only a single weather station, Marechal Cunha Machado International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of São Luís.

At a distance of 10 kilometers from São Luís, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and São Luís according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.