July Weather in Houston Texas, United States

Daily high temperatures increase by 2°F, from 93°F to 95°F, rarely falling below 87°F or exceeding 100°F.

Daily low temperatures are around 77°F, rarely falling below 74°F or exceeding 80°F.

For reference, on August 5, the hottest day of the year, temperatures in Houston typically range from 77°F to 95°F, while on January 5, the coldest day of the year, they range from 47°F to 63°F.

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.

Zhangzhou, China (8,103 miles away) is the far-away foreign place with temperatures most similar to Houston (view comparison).

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The month of July in Houston experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 43% to 48%.

The clearest day of the month is July 1, with clear, mostly clear, or partly cloudy conditions 57% of the time.

For reference, on August 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, while on October 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Houston, the chance of a wet day over the course of July is rapidly decreasing, starting the month at 38% and ending it at 31%.

For reference, the year's highest daily chance of a wet day is 40% on June 23, and its lowest chance is 21% on April 14.

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 Houston is rapidly decreasing, starting the month at 4.0 inches, when it rarely exceeds 8.3 inches or falls below 1.0 inches, and ending the month at 2.7 inches, when it rarely exceeds 5.7 inches or falls below 0.7 inches.

The lowest average 31-day accumulation is 2.7 inches on July 31.

Over the course of July in Houston, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 27 minutes, implying an average daily decrease of 55 seconds, and weekly decrease of 6 minutes, 24 seconds.

The shortest day of the month is July 31, with 13 hours, 34 minutes of daylight and the longest day is July 1, with 14 hours, 1 minute of daylight.

The earliest sunrise of the month in Houston is 6:24 AM on July 1 and the latest sunrise is 16 minutes later at 6:40 AM on July 31.

The latest sunset is 8:26 PM on July 1 and the earliest sunset is 12 minutes earlier at 8:14 PM on July 31.

Daylight saving time is observed in Houston during 2024, but it neither starts nor ends during July, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:21 AM and sets 14 hours, 4 minutes later, at 8:25 PM, while on December 21, the shortest day of the year, it rises at 7:12 AM and sets 10 hours, 14 minutes later, at 5:26 PM.

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.

The figure below presents a compact representation of key lunar data for July 2024. 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.

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 Houston is essentially constant during July, remaining within 1% of 98% throughout.

The highest chance of a muggy day during July is 98% on July 21.

For reference, on July 20, the muggiest day of the year, there are muggy conditions 98% of the time, while on January 29, the least muggy day of the year, there are muggy conditions 6% of the time.

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 Houston is gradually decreasing during July, decreasing from 7.0 miles per hour to 6.4 miles per hour over the course of the month.

For reference, on April 2, the windiest day of the year, the daily average wind speed is 9.4 miles per hour, while on August 15, the calmest day of the year, the daily average wind speed is 6.2 miles per hour.

The hourly average wind direction in Houston throughout July is predominantly from the south, with a peak proportion of 71% on July 1.

Houston 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 Houston is essentially constant during July, remaining within 1°F of 85°F throughout.

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).

The growing season in Houston typically lasts for 12 months (351 days), from around January 18 to around January 3, rarely starting after February 26, or ending before December 4.

The month of July in Houston is reliably fully 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 Houston are very rapidly increasing during July, increasing by 970°F, from 3,292°F to 4,262°F, over the course of the month.

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 Houston is essentially constant during July, remaining within 0.1 kWh of 6.0 kWh throughout.

For the purposes of this report, the geographical coordinates of Houston are 29.763 deg latitude, -95.363 deg longitude, and 36 ft elevation.

The topography within 2 miles of Houston is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 43 feet. Within 10 miles is also essentially flat (95 feet). Within 50 miles is essentially flat (433 feet).

The area within 2 miles of Houston is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (94%), and within 50 miles by cropland (40%) and artificial surfaces (22%).