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  4. Porto Murtinho
  5. May

Average Weather in May in Porto Murtinho Brazil

Daily high temperatures decrease by 5°F, from 86°F to 81°F, rarely falling below 69°F or exceeding 94°F.

Daily low temperatures decrease by 4°F, from 67°F to 63°F, rarely falling below 51°F or exceeding 75°F.

For reference, on January 15, the hottest day of the year, temperatures in Porto Murtinho typically range from 76°F to 93°F, while on July 20, the coldest day of the year, they range from 60°F to 81°F.

Average High and Low Temperature in May

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 May. 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 May

Average Hourly Temperature in May in Porto Murtinho18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMAprJuncoolcomfortablecomfortablewarmwarmhot
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.

Santa Isabel, Mexico (3,946 miles away) is the far-away foreign place with temperatures most similar to Porto Murtinho (view comparison).


The month of May in Porto Murtinho experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 35% throughout the month.

The clearest day of the month is May 7, with clear, mostly clear, or partly cloudy conditions 66% of the time.

For reference, on January 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 61%, while on August 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.

Cloud Cover Categories in May

Cloud Cover Categories in May in Porto Murtinho1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 166%May 166%May 3166%May 3166%May 1166%May 1166%May 2165%May 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 Porto Murtinho, the chance of a wet day over the course of May is gradually decreasing, starting the month at 27% and ending it at 23%.

For reference, the year's highest daily chance of a wet day is 45% on January 10, and its lowest chance is 11% on August 10.

Probability of Precipitation in May

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).


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 May in Porto Murtinho is decreasing, starting the month at 3.6 inches, when it rarely exceeds 6.6 inches or falls below 1.1 inches, and ending the month at 2.8 inches, when it rarely exceeds 5.4 inches or falls below 0.7 inches.

Average Monthly Rainfall in May

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 liquid-equivalent snowfall.


Over the course of May in Porto Murtinho, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 24 minutes, implying an average daily decrease of 48 seconds, and weekly decrease of 5 minutes, 35 seconds.

The shortest day of the month is May 31, with 10 hours, 54 minutes of daylight and the longest day is May 1, with 11 hours, 18 minutes of daylight.

Hours of Daylight and Twilight in May

Hours of Daylight and Twilight in May in Porto Murtinho1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAprJundaydaydaydaynightMay 111 hr, 18 minMay 111 hr, 18 minMay 3110 hr, 54 minMay 3110 hr, 54 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 Porto Murtinho is 6:09 AM on May 1 and the latest sunrise is 13 minutes later at 6:22 AM on May 31.

The latest sunset is 5:27 PM on May 1 and the earliest sunset is 11 minutes earlier at 5:16 PM on May 31.

Daylight saving time is observed in Porto Murtinho during 2019, but it neither starts nor ends during May, so the entire month is in standard time.

For reference, on December 22, the longest day of the year, the Sun rises at 6:06 AM and sets 13 hours, 28 minutes later, at 7:33 PM, while on June 21, the shortest day of the year, it rises at 6:29 AM and sets 10 hours, 49 minutes later, at 5:17 PM.

Sunrise & Sunset with Twilight in May

The solar day over the course of May. 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.


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 Porto Murtinho is rapidly decreasing during May, falling from 41% to 23% over the course of the month.

For reference, on February 28, the muggiest day of the year, there are muggy conditions 83% of the time, while on July 28, the least muggy day of the year, there are muggy conditions 9% of the time.

Humidity Comfort Levels in May

Humidity Comfort Levels in May in Porto Murtinho1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%AprJunMay 141%May 141%May 3123%May 3123%May 1132%May 1132%May 2127%May 2127%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 Porto Murtinho is essentially constant during May, remaining within 0.2 miles per hour of 8.3 miles per hour throughout.

For reference, on September 8, the windiest day of the year, the daily average wind speed is 10.1 miles per hour, while on March 18, the calmest day of the year, the daily average wind speed is 6.7 miles per hour.

Average Wind Speed in May

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 Porto Murtinho throughout May is predominantly from the north, with a peak proportion of 38% on May 31.

Wind Direction in May

Wind Direction in May in Porto Murtinho1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunsoutheastnorth
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).

Growing Season

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 Porto Murtinho 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 May

Time Spent in Various Temperature Bands and the Growing Season in May in Porto Murtinho1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJun100%May 16100%May 16coolcomfortablewarmhotcoldsweltering
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 Porto Murtinho are rapidly increasing during May, increasing by 684°F, from 8,575°F to 9,259°F, over the course of the month.

Growing Degree Days in May

The average growing degree days accumulated over the course of May, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 Porto Murtinho is gradually decreasing during May, falling by 0.7 kWh, from 4.9 kWh to 4.2 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in May

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 Porto Murtinho are -21.699 deg latitude, -57.882 deg longitude, and 256 ft elevation.

The topography within 2 miles of Porto Murtinho is essentially flat, with a maximum elevation change of 46 feet and an average elevation above sea level of 256 feet. Within 10 miles is essentially flat (571 feet). Within 50 miles contains significant variations in elevation (2,336 feet).

The area within 2 miles of Porto Murtinho is covered by trees (34%), shrubs (25%), cropland (13%), and water (12%), within 10 miles by trees (50%) and shrubs (20%), and within 50 miles by trees (60%) and shrubs (19%).

Data Sources

This report illustrates the typical weather in Porto Murtinho year round, 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, Puerto Casado, in our network suitable to be used as a proxy for the historical temperature and dew point records of Porto Murtinho.

At a distance of 65 kilometers from Porto Murtinho, 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 Porto Murtinho 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 Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.


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.