Houston Mosquito Forecast
Live mosquito activity levels for the Greater Houston area, updated daily with real weather data.
Houston consistently ranks among the worst cities for mosquitoes in the entire United States. The data backs it up. Sitting just 50 miles from the Gulf of Mexico on the flat Upper Texas Coastal Plain, Houston combines oppressive humidity, heavy rainfall averaging nearly 60 inches per year, and a sprawling bayou network that creates an ideal breeding landscape for dozens of mosquito species. Harris County alone tracks more than 50 species through its mosquito surveillance program, including disease vectors like Aedes aegypti and Culex quinquefasciatus.
Our forecast model for Houston factors in the city's unique hydrology. The bayou system (Buffalo Bayou, Brays Bayou, White Oak Bayou, and Sims Bayou) acts as a vast network of slow-moving drainage channels that retain standing water for days after rain events. Combine that with Houston's flat terrain (average elevation just 50 feet above sea level), and water pools in thousands of low-lying areas across the metro, giving mosquito larvae exactly what they need to thrive.
Current Houston Mosquito Forecast
See today's predicted activity level and 7-day trend for Houston on our interactive map.
View Houston's Live Forecast →Mosquito Season in Houston
Mosquito season in Houston runs from roughly late February through early December, making it one of the longest active seasons in Texas. The warm, humid climate lets mosquitoes start breeding as early as February when temperatures consistently exceed 50°F. They do not fully taper off until the first sustained cold front pushes through in late November or early December.
Peak mosquito activity in Houston occurs from May through October, with the absolute worst months typically being June through September. During this window, our forecast model regularly produces scores between 65 and 85 out of 100 for the Houston metro area. Late-summer tropical moisture surges and afternoon thunderstorms create repeated boom cycles: heavy rain fills breeding sites, followed by several hot, humid days that accelerate larval development to just 7-10 days from egg to adult.
Compared to inland Texas cities like Dallas or Austin, Houston's mosquito season starts earlier, peaks higher, and lasts longer. The Gulf moisture is the primary driver. Even during October, when cities in North Texas see significant drops in activity, Houston often maintains moderate-to-high levels because overnight temperatures rarely dip below 60°F until November.
What Makes Houston Unique
The Bayou Factor: Houston's 2,500+ miles of bayous and channels are not just flood control infrastructure. They form the largest connected mosquito breeding habitat in any major U.S. city. After every rainstorm, these slow-draining waterways retain shallow pools along their banks for days, creating prime egg-laying sites for floodwater mosquito species like Aedes vexans.
Urban Heat Island Effect: Houston's massive concrete footprint raises nighttime temperatures by 3-5°F compared to surrounding rural areas. Warmer nights accelerate mosquito metabolism and extend their active feeding hours. If you live in a dense inner-loop neighborhood, you have probably noticed intense biting pressure well after sunset.
Houston's proximity to the Gulf of Mexico also means it sits directly in the path of tropical weather systems. Hurricane and tropical storm remnants can dump 10+ inches of rain in a single event, leading to explosive mosquito hatches 10-14 days later. Harris County Mosquito Control typically ramps up aerial spraying operations in the weeks following major rain events for exactly this reason.
Houston's extensive park system (Memorial Park, Buffalo Bayou Park, Hermann Park) provides additional habitat with dense tree canopy that creates the shaded, humid microclimates mosquitoes prefer during the heat of the day. Even well-maintained residential neighborhoods in areas like The Heights, Meyerland, and Bellaire deal with persistent mosquito pressure. The shallow water table and aging stormwater infrastructure make it nearly impossible to eliminate standing water completely.
Tips for Houston Residents
- Drain standing water aggressively after storms. Houston's flat terrain means water collects in flower pot saucers, gutter seams, and tarps for days. Walk your property within 48 hours of any significant rainfall and dump every container. Mosquito eggs can hatch in as little as a teaspoon of water.
- Treat your bayou-adjacent property. If you live within a few blocks of any bayou, creek, or drainage ditch, consider using BTI mosquito dunks in rain barrels, birdbaths, and any standing water you cannot drain. BTI is a biological larvicide that targets mosquito larvae without harming other wildlife.
- Time outdoor activities around peak biting hours. In Houston, mosquitoes are most aggressive at dawn (5:00-7:00 AM) and dusk (7:00-9:30 PM). If you are walking the trails at Buffalo Bayou Park or exercising at Memorial Park, midday is actually the safest time despite the heat.
- Use fans on covered patios. Mosquitoes are weak fliers, so a box fan or ceiling fan on a covered porch creates enough airflow to keep them away from your seating area without any chemicals. Try it on Houston's still, humid evenings. You will be surprised how well it works.
- Monitor Harris County Mosquito Control. Harris County operates one of the most active mosquito surveillance programs in the country and publishes trap data and spray schedules. Our forecast model correlates strongly with their surveillance findings, check both for the most complete picture.
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