Climate and Average Weather Year Round in Brownsville Texas, United States
In Brownsville, the summers are long, hot, and oppressive; the winters are short, cool, dry, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 52°F to 94°F and is rarely below 39°F or above 98°F.
Based on the beach/pool score, the best time of year to visit Brownsville for hot-weather activities is from mid April to mid June.
Climate in Brownsville
The hot season lasts for 4.0 months, from May 22 to September 22, with an average daily high temperature above 90°F. The hottest month of the year in Brownsville is August, with an average high of 94°F and low of 76°F.
The cool season lasts for 2.5 months, from December 4 to February 19, with an average daily high temperature below 75°F. The coldest month of the year in Brownsville is January, with an average low of 52°F and high of 71°F.
Average High and Low Temperature in Brownsville
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Brownsville
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
In Brownsville, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Brownsville begins around January 30 and lasts for 4.9 months, ending around June 26.
The clearest month of the year in Brownsville is May, during which on average the sky is clear, mostly clear, or partly cloudy 70% of the time.
The cloudier part of the year begins around June 26 and lasts for 7.1 months, ending around January 30.
The cloudiest month of the year in Brownsville is August, during which on average the sky is overcast or mostly cloudy 60% of the time.
Cloud Cover Categories in Brownsville
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Brownsville varies significantly throughout the year.
The wetter season lasts 3.7 months, from June 21 to October 12, with a greater than 23% chance of a given day being a wet day. The month with the most wet days in Brownsville is September, with an average of 10.2 days with at least 0.04 inches of precipitation.
The drier season lasts 8.3 months, from October 12 to June 21. The month with the fewest wet days in Brownsville is February, with an average of 2.5 days with at least 0.04 inches of precipitation.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Brownsville is September, with an average of 10.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 38% on September 14.
Daily Chance of Precipitation in Brownsville
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Brownsville experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Brownsville. The month with the most rain in Brownsville is September, with an average rainfall of 4.2 inches.
The month with the least rain in Brownsville is February, with an average rainfall of 0.8 inches.
Average Monthly Rainfall in Brownsville
The length of the day in Brownsville varies over the course of the year. In 2022, the shortest day is December 21, with 10 hours, 31 minutes of daylight; the longest day is June 21, with 13 hours, 46 minutes of daylight.
Hours of Daylight and Twilight in Brownsville
The earliest sunrise is at 6:37 AM on June 8, and the latest sunrise is 1 hour, 4 minutes later at 7:41 AM on November 5. The earliest sunset is at 5:38 PM on November 30, and the latest sunset is 2 hours, 48 minutes later at 8:25 PM on July 1.
Daylight saving time (DST) is observed in Brownsville during 2022, starting in the spring on March 13, lasting 7.8 months, and ending in the fall on November 6.
Sunrise & Sunset with Twilight and Daylight Saving Time in Brownsville
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 Brownsville
The figure below presents a compact representation of key lunar data for 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.
Moon Rise, Set & Phases in Brownsville
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.
Brownsville experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 8.4 months, from March 14 to November 27, during which time the comfort level is muggy, oppressive, or miserable at least 36% of the time. The month with the most muggy days in Brownsville is July, with 30.9 days that are muggy or worse.
The month with the fewest muggy days in Brownsville is January, with 4.9 days that are muggy or worse.
Humidity Comfort Levels in Brownsville
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Brownsville experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 9.0 months, from October 31 to July 31, with average wind speeds of more than 11.1 miles per hour. The windiest month of the year in Brownsville is April, with an average hourly wind speed of 12.8 miles per hour.
The calmer time of year lasts for 3.0 months, from July 31 to October 31. The calmest month of the year in Brownsville is September, with an average hourly wind speed of 9.5 miles per hour.
Average Wind Speed in Brownsville
The predominant average hourly wind direction in Brownsville varies throughout the year.
The wind is most often from the south for 7.9 months, from January 7 to September 3 and for 2.7 months, from October 7 to December 29, with a peak percentage of 75% on July 17. The wind is most often from the east for 1.1 months, from September 3 to October 7, with a peak percentage of 46% on September 8. The wind is most often from the north for 1.3 weeks, from December 29 to January 7, with a peak percentage of 40% on January 1.
Wind Direction in Brownsville
Brownsville 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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 4.4 months, from June 5 to October 16, with an average temperature above 80°F. The month of the year in Brownsville with the warmest water is September, with an average temperature of 83°F.
The time of year with cooler water lasts for 3.3 months, from December 25 to April 3, with an average temperature below 70°F. The month of the year in Brownsville with the coolest water is February, with an average temperature of 66°F.
Average Water Temperature in Brownsville
To characterize how pleasant the weather is in Brownsville throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Brownsville for general outdoor tourist activities are from late February to early May and from mid October to late November, with a peak score in the last week of March.
Tourism Score in Brownsville
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Brownsville for hot-weather activities is from mid April to mid June, with a peak score in the second week of May.
Beach/Pool Score in Brownsville
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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).
While it does not do so every year, freezing temperatures are seen in Brownsville over some winters. The day least likely to be in the growing season is January 5, with a 77% chance.
Time Spent in Various Temperature Bands and the Growing Season in Brownsville
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
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.
Based on growing degree days alone, the first spring blooms in Brownsville should appear around January 8, only rarely appearing before January 6 or after January 12.
Growing Degree Days in Brownsville
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 experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 2.7 months, from April 11 to July 1, with an average daily incident shortwave energy per square meter above 6.4 kWh. The brightest month of the year in Brownsville is May, with an average of 6.9 kWh.
The darker period of the year lasts for 2.6 months, from November 15 to February 2, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest month of the year in Brownsville is December, with an average of 3.5 kWh.
Average Daily Incident Shortwave Solar Energy in Brownsville
For the purposes of this report, the geographical coordinates of Brownsville are 25.902 deg latitude, -97.497 deg longitude, and 33 ft elevation.
The topography within 2 miles of Brownsville is essentially flat, with a maximum elevation change of 59 feet and an average elevation above sea level of 30 feet. Within 10 miles is also essentially flat (85 feet). Within 50 miles is essentially flat (282 feet).
The area within 2 miles of Brownsville is covered by artificial surfaces (84%), within 10 miles by artificial surfaces (42%) and cropland (29%), and within 50 miles by cropland (39%) and water (38%).
This report illustrates the typical weather in Brownsville, 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Brownsville.
For each station, the records are corrected for the elevation difference between that station and Brownsville according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Brownsville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Brownsville and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Brownsville and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 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.
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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