Average Weather at Port Isabel, Port Isabel-Cameron County Airport Texas, United States
At Port Isabel, Port Isabel-Cameron County Airport, the summers are long, hot, and oppressive; the winters are short, cool, and dry; and it is windy and partly cloudy year round. Over the course of the year, the temperature typically varies from 53°F to 93°F and is rarely below 40°F or above 96°F.
Based on the beach/pool score, the best time of year to visit Port Isabel, Port Isabel-Cameron County Airport for hot-weather activities is from mid April to early June.
The hot season lasts for 4.0 months, from May 27 to September 25, with an average daily high temperature above 88°F. The hottest day of the year is August 3, with an average high of 93°F and low of 79°F.
The cool season lasts for 2.6 months, from December 5 to February 22, with an average daily high temperature below 74°F. The coldest day of the year is January 5, with an average low of 53°F and high of 69°F.
Average High and Low Temperature
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
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
At Port Isabel, Port Isabel-Cameron County Airport, 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 at Port Isabel, Port Isabel-Cameron County Airport begins around February 3 and lasts for 4.8 months, ending around June 26. On June 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time.
The cloudier part of the year begins around June 26 and lasts for 7.2 months, ending around February 3. On August 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 60% of the time, and clear, mostly clear, or partly cloudy 40% of the time.
Cloud Cover Categories
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 at Port Isabel, Port Isabel-Cameron County Airport varies significantly throughout the year.
The wetter season lasts 2.0 months, from August 20 to October 22, with a greater than 23% chance of a given day being a wet day. The chance of a wet day peaks at 38% on September 14.
The drier season lasts 10.0 months, from October 22 to August 20. The smallest chance of a wet day is 7% on February 21.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. 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
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. Port Isabel, Port Isabel-Cameron County Airport experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year at Port Isabel, Port Isabel-Cameron County Airport. The most rain falls during the 31 days centered around September 17, with an average total accumulation of 4.0 inches.
The least rain falls around December 20, with an average total accumulation of 0.8 inches.
Average Monthly Rainfall
The length of the day at Port Isabel, Port Isabel-Cameron County Airport varies over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 30 minutes of daylight; the longest day is June 21, with 13 hours, 47 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:36 AM on June 9, and the latest sunrise is 1 hour, 6 minutes later at 7:42 AM on March 11. The earliest sunset is at 5:37 PM on November 30, and the latest sunset is 2 hours, 49 minutes later at 8:25 PM on July 2.
Daylight saving time (DST) is observed at Port Isabel, Port Isabel-Cameron County Airport during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
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.
Port Isabel, Port Isabel-Cameron County Airport experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 8.6 months, from March 13 to November 30, during which time the comfort level is muggy, oppressive, or miserable at least 38% of the time. The muggiest day of the year is July 24, with muggy conditions 100% of the time.
The least muggy day of the year is January 23, with muggy conditions 17% of the time.
Humidity Comfort Levels
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 at Port Isabel, Port Isabel-Cameron County Airport experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 9.2 months, from October 20 to July 27, with average wind speeds of more than 11.5 miles per hour. The windiest day of the year is April 8, with an average hourly wind speed of 13.2 miles per hour.
The calmer time of year lasts for 2.8 months, from July 27 to October 20. The calmest day of the year is September 6, with an average hourly wind speed of 9.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Port Isabel, Port Isabel-Cameron County Airport varies throughout the year.
The wind is most often from the south for 7.7 months, from January 9 to August 30 and for 2.5 months, from October 13 to December 29, with a peak percentage of 73% on July 17. The wind is most often from the east for 1.5 months, from August 30 to October 13, with a peak percentage of 49% on September 8. The wind is most often from the north for 1.6 weeks, from December 29 to January 9, with a peak percentage of 40% on January 1.
Port Isabel, Port Isabel-Cameron County Airport 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 day of the year with the warmest water is September 5, with an average temperature of 84°F.
The time of year with cooler water lasts for 3.3 months, from December 26 to April 4, with an average temperature below 70°F. The day of the year with the coolest water is February 19, with an average temperature of 66°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is at Port Isabel, Port Isabel-Cameron County Airport 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 Port Isabel, Port Isabel-Cameron County Airport for general outdoor tourist activities are from late February to late April and from late October to late November, with a peak score in the last week of March.
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 Port Isabel, Port Isabel-Cameron County Airport for hot-weather activities is from mid April to early June, with a peak score in the second week of May.
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).
Temperatures at Port Isabel, Port Isabel-Cameron County Airport 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
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.
Growing Degree Days
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 6.3 kWh. The brightest day of the year is June 3, with an average of 7.1 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 4.1 kWh. The darkest day of the year is December 31, with an average of 3.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Port Isabel, Port Isabel-Cameron County Airport are 26.159 deg latitude, -97.338 deg longitude, and 10 ft elevation.
The topography within 2 miles of Port Isabel, Port Isabel-Cameron County Airport is essentially flat, with a maximum elevation change of 20 feet and an average elevation above sea level of 9 feet. Within 10 miles is also essentially flat (33 feet). Within 50 miles is essentially flat (157 feet).
The area within 2 miles of Port Isabel, Port Isabel-Cameron County Airport is covered by grassland (32%), artificial surfaces (29%), shrubs (18%), and herbaceous vegetation (13%), within 10 miles by water (32%) and grassland (21%), and within 50 miles by water (48%) and cropland (26%).
This report illustrates the typical weather at Port Isabel, Port Isabel-Cameron County Airport, 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
Port Isabel, Port Isabel-Cameron County Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Brownsville-South Padre Island International Airport; Rio Grande Valley International Airport; Mid Valley Airport; Edinburg Rio Grande Valley Regional Freight Terminal Airport; McAllen Miller International Airport; Brooks County Airport; Kingsville, Naval Air Station; and Corpus Christi, Corpus Christi Naval Air Station/Truax Field.
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.