July weather forecast
Houston, TX

July is typically the hottest month in Houston with the mercury peaking at 93.4°F (34.1°C). It's a time when the city thrives under the summer sun and embraces the hustle and bustle of the season. The summer heat does not diminish the vibrancy of Houston, but rather adds to the festival-like atmosphere that envelops the city during this time. While spending extended time outdoors may be uncomfortable for some, others see it as an opportunity for water-based activities, thanks to the sultry conditions. In spite of the heat, the city's energy and the plethora of activities on offer ensure there's never a dull moment in Houston in July.

Temperature

Houston's weather in July displays an average high-temperature of a still hot 93.4°F (34.1°C), showing minor disparity from June's 91°F (32.8°C). Houston records an average nighttime low-temperature of 77.2°F (25.1°C) throughout July.

Heat index

July's mean heat index is estimated at a life-threatening hot 120.2°F (49°C). Stay wary: Heat exhaustion and heat cramps are possible. Heatstroke can ensue from extended effort.
Heat index values are typically calculated for conditions of shade and a light breeze. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

In July, the average relative humidity is 73%.

Rainfall

In Houston, in July, during 17.6 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Houston, during the entire year, the rain falls for 180.5 days and collects up to 35.35" (898mm) of precipitation.

Snowfall

February through November are months without snowfall.

Daylight

In July, the average length of the day in Houston is 13h and 50min.
On the first day of July, sunrise is at 6:24 am and sunset at 8:26 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 8:14 pm CDT.

Sunshine

In July, the average sunshine in Houston is 10.4h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In July, the maximum UV index of 7 translates into these guidelines:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.