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July Weather in São Luís Brazil

Daily high temperatures are around 89°F, rarely falling below 86°F or exceeding 92°F. The lowest daily average high temperature is 88°F on July 9.

Daily low temperatures are around 77°F, rarely falling below 74°F or exceeding 79°F. The lowest daily average low temperature is 77°F on July 10.

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 July in São Luís

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 temperatures for the quarter of the year centered on July. 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 July in São Luís

Average Hourly Temperature in July in São LuísJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAugwarmwarmhot
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).

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The month of July in São Luís experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 42% to 33%.

The clearest day of the month is July 31, with clear, mostly clear, or partly cloudy conditions 67% 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 July in São Luís

Cloud Cover Categories in July in São LuísJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugJul 158%Jul 158%Jul 3167%Jul 3167%Jul 1162%Jul 1162%Jul 2165%Jul 2165%clearmostly 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 July is very rapidly decreasing, starting the month at 43% and ending it at 19%.

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 July in São Luís

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during July in São Luís is very rapidly decreasing, starting the month at 3.6 inches, when it rarely exceeds 6.3 inches or falls below 1.0 inches, and ending the month at 1.4 inches, when it rarely exceeds 3.1 inches or falls below 0.2 inches.

Average Monthly Rainfall in July in São Luís

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 July in São Luís, the length of the day is essentially constant. The shortest day of the month is July 1, with 11 hours, 59 minutes of daylight and the longest day is July 31, with 12 hours, 0 minutes of daylight.

Hours of Daylight and Twilight in July in São Luís

Hours of Daylight and Twilight in July in São LuísJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrJunAugdaydaydaydaynightJul 111 hr, 59 minJul 111 hr, 59 minJul 3112 hr, 0 minJul 3112 hr, 0 min
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 earliest sunrise of the month in São Luís is 6:01 AM on July 1 and the latest sunrise is 2 minutes, 6 seconds later at 6:03 AM on July 22.

The earliest sunset is 6:00 PM on July 1 and the latest sunset is 3 minutes later at 6:03 PM on July 31.

Daylight saving time is not observed in São Luís during 2022.

For reference, on December 21, 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 July in São Luís

Sunrise & Sunset with Twilight in July in São LuísJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJunAug6:01 AM6:01 AMJul 16:00 PMJul 16:00 PM6:03 AM6:03 AMJul 316:03 PMJul 316:03 PM6:03 AM6:03 AMJul 166:02 PMJul 166:02 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of July. 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 July in São Luís

Solar Elevation and Azimuth in July in São LuísJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAug001010202020303040405050506060000101020203030304040505060606070
northeastsouthwest
Solar elevation and azimuth over the course of July 2022. 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 July 2022. 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 July in São Luís

Moon Rise, Set & Phases in July in São LuísJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJunAugJun 148:52 AMJun 148:52 AMJun 2811:53 PMJun 2811:53 PMJul 133:38 PMJul 133:38 PMJul 282:56 PMJul 282:56 PMAug 1110:36 PMAug 1110:36 PMAug 275:18 AMAug 275:18 AM5:11 PM5:11 PM5:54 AM5:54 AM5:29 AM5:29 AM5:43 PM5:43 PM6:07 PM6:07 PM6:50 AM6:50 AM5:55 AM5:55 AM6:10 PM6:10 PM5:54 PM5:54 PM6:30 AM6:30 AM6:10 AM6:10 AM6:27 PM6:27 PM
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.
Jul 2022IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
6%7:58 AMENE8:13 PMWNW-2:07 PMN251,326 mi
2
12%8:45 AMENE9:00 PMWNW-2:54 PMN249,945 mi
3
19%9:29 AMENE9:46 PMWNW-3:38 PMN248,034 mi
4
27%10:12 AME10:30 PMW-4:21 PMN245,585 mi
5
37%10:54 AME11:14 PMW-5:04 PMN242,624 mi
6
50%11:36 AME11:58 PMW-5:47 PMN239,228 mi
7
59%12:19 PME--6:31 PMS235,539 mi
8
70%-12:45 AMW1:05 PMESE7:19 PMS231,771 mi
9
80%-1:36 AMWSW1:56 PMESE8:12 PMS228,208 mi
10
89%-2:31 AMWSW2:52 PMESE9:11 PMS225,183 mi
11
96%-3:32 AMWSW3:54 PMESE10:15 PMS223,034 mi
12
99%-4:37 AMWSW5:00 PMESE11:22 PMS222,040 mi
13
100%-5:44 AMWSW6:07 PMESE--
14
100%-6:50 AMWSW7:12 PMESE12:30 AMS222,349 mi
15
97%-7:51 AMWSW8:12 PMESE1:33 AMS223,935 mi
16
91%-8:46 AMWSW9:07 PMESE2:31 AMS226,608 mi
17
83%-9:36 AMW9:57 PME3:23 AMS230,067 mi
18
74%-10:22 AMW10:44 PME4:10 AMS233,959 mi
19
63%-11:06 AMW11:30 PME4:55 AMN237,943 mi
20
50%-11:49 AMW-5:39 AMN241,724 mi
21
42%12:15 AMENE12:32 PMWNW-6:23 AMN245,079 mi
22
32%1:00 AMENE1:16 PMWNW-7:07 AMN247,858 mi
23
23%1:47 AMENE2:02 PMWNW-7:53 AMN249,982 mi
24
16%2:35 AMENE2:50 PMWNW-8:42 AMN251,432 mi
25
9%3:25 AMENE3:40 PMWNW-9:32 AMN252,233 mi
26
4%4:15 AMENE4:30 PMWNW-10:23 AMN252,442 mi
27
1%5:06 AMENE5:21 PMWNW-11:14 AMN252,130 mi
28
0%5:55 AMENE6:10 PMWNW-12:04 PMN251,363 mi
29
1%6:43 AMENE6:58 PMWNW-12:51 PMN250,196 mi
30
4%7:28 AMENE7:44 PMWNW-1:37 PMN248,666 mi
31
8%8:11 AMENE8:29 PMW-2:21 PMN246,792 mi

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 July, 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 July in São Luís

Humidity Comfort Levels in July in São LuísJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JunAugJul 1100%Jul 1100%Jul 3199%Jul 3199%Jul 11100%Jul 11100%Jul 21100%Jul 21100%miserablemiserableoppressiveoppressivemuggymuggy
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 essentially constant during July, remaining within 0.2 miles per hour of 5.0 miles per hour throughout.

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.

Average Wind Speed in July in São Luís

Average Wind Speed in July in São LuísJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphJunAugJul 14.8 mphJul 14.8 mphJul 315.2 mphJul 315.2 mphJul 164.9 mphJul 164.9 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in São Luís throughout July is predominantly from the east, with a peak proportion of 80% on July 2.

Wind Direction in July in São Luís

Wind Direction in July in São LuísJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JunAugeastnorth
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 July, remaining around 83°F throughout.

Average Water Temperature in July in São Luís

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 July in São Luís

Time Spent in Various Temperature Bands and the Growing Season in July in São LuísJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug100%Jul 16100%Jul 16100%Jul 3100%Jul 3warmhotcomfortable
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 July, increasing by 931°F, from 1°F to 932°F, over the course of the month.

Growing Degree Days in July in São Luís

Growing Degree Days in July in São LuísJul1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131100°F100°F200°F200°F300°F300°F400°F400°F500°F500°F600°F600°F700°F700°F800°F800°F900°F900°FJunAugJul 11°FJul 11°FJul 31932°FJul 31932°FJul 11310°FJul 11310°FJul 21620°FJul 21620°F
The average growing degree days accumulated over the course of July, 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 gradually increasing during July, rising by 0.6 kWh, from 5.4 kWh to 6.0 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in July in São Luís

Average Daily Incident Shortwave Solar Energy in July in São LuísJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhJunAugJul 15.4 kWhJul 15.4 kWhJul 316.0 kWhJul 316.0 kWhJul 165.6 kWhJul 165.6 kWh
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.

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