A heat dome is bringing hotter weather back to Houston

The Houston area is in for a spell of hot and humid weather, with temperatures expected to remain above normal through July 4, according to the National Oceanic and Atmospheric Administration's (NOAA) Climate Prediction Center outlook. This heat wave is the result of a weather pattern shift in the area, with a strengthening ridge of high pressure suppressing rain chances and bringing back the typical late-June mix of heat and humidity. As a result, temperatures this week are expected to stay shy of the century mark, but with above-normal warmth favored through the end of June and into early July, the city's first triple-digit temperature may be drawing closer. Houston hasn't yet recorded a 100-degree day in 2026, and temperatures this week should stay shy of the century mark. The combination of heat, high dew points, and lingering moisture in the soil could push heat index values well into the triple digits during the afternoon hours.

As the heat dome takes control of Houston's weather pattern, rain chances are expected to decline, and high temperatures will climb back into the low to mid-90s across much of the city, while overnight lows remain warm and muggy in the upper 70s. The increased heat is being fueled by a strengthening upper-level ridge, often referred to as a heat dome, which acts like a lid on the atmosphere, suppressing widespread thunderstorm development while allowing temperatures to climb. Southeast Texas is expected to see a stretch of hotter afternoons, fewer rain chances, and more sunshine through at least next weekend. The heat dome is a common phenomenon during the late-spring and early-summer months, and it can bring extremely hot temperatures to the region.

While Houston's temperatures won't reach 100 degrees just yet, above-normal warmth favored into early July suggests the city's first triple-digit temperature may be getting closer. Overnight temperatures could struggle to fall much below 80 degrees, limiting opportunities for the region to cool off between days and contributing to a steady warming pattern. This is not unusual for this time of year, as the summer months are typically characterized by hot and humid weather in the Houston area. However, with above-normal temperatures expected, the region may experience an extended period of heat.

The heat is not just a matter of temperature; it's also about the humidity. The combination of heat and humidity can make the weather feel significantly hotter than the actual temperature. In fact, the heat index value, which takes into account both temperature and dew point, is expected to reach well into the triple digits during the afternoon hours. This makes it essential for residents to take precautions to stay cool and avoid heat-related illnesses.

So, what can you do to stay safe during this heat wave? First, stay hydrated by drinking plenty of water and other fluids. Avoid strenuous activities during the hottest part of the day, and take breaks in cooled areas whenever possible. Also, check on vulnerable neighbors, especially the elderly and young children, to ensure they are staying cool and safe. Finally, plan for outdoor activities during cooler parts of the day, such as early morning or evening. By taking these precautions, you can stay safe and healthy during this heat wave.

Looking forward, the heat wave is expected to continue through early July, with above-normal warmth favored across the southern and eastern United States. This means that residents of Southeast Texas should continue to expect hot and humid weather, with temperatures staying above normal. The good news is that the heat wave is not expected to last long, with cooler temperatures expected to return by the middle of the month. In the meantime, it's essential to take precautions to stay safe and healthy.

Justin Ballard, the Houston Chronicle's newsroom meteorologist, notes that 'the heat dome is a common phenomenon during the late-spring and early-summer months, and it can bring extremely hot temperatures to the region.' Ballard also notes that 'above-normal temperatures are expected to continue through early July, with the heat wave not expected to last long.' By staying informed and taking precautions, residents of Southeast Texas can stay safe and healthy during this heat wave.