Last updated: February 24, 2025
Experience the vibrant September weather in Houston, United States, where temperatures soar with a maximum of 37°C (99°F) while maintaining an inviting average of 27°C (80°F). The month brings a refreshing contrast with minimum temperatures dipping to 13°C (55°F). Rainfall is significant, with a total precipitation of 202 mm (8.0 in) over 15 days, contributing to the lush greenery of the region. Coupled with a humidity level of 73%, this month showcases Houston's dynamic climate, offering a mix of heat and tropical feel that defines this lively city in early autumn.
In September, Houston experiences a transition to more moderate temperatures, signaling the approach of fall. The month starts with a minimum temperature of 13°C (55°F), offering a refreshing relief from the sweltering summer heat, while the average temperature settles at 27°C (80°F). However, the city still feels the lingering warmth, peaking at an impressive 37°C (99°F), reminiscent of the hottest summer days. This pattern showcases the gradual shift from the intense highs of August to the cooler averages of October, making September a month of both heat and relief—a perfect time to enjoy the vibrant outdoor culture before the temperatures dip further.
In September, Houston experiences a significant uptick in precipitation, with an impressive 202 mm (8.0 in) of rain over 15 days. This marks a continuation of the trend seen throughout the summer, where the months of August and September account for some of the highest rainfall totals of the year. As the sweltering heat of summer begins to ease, the region sees frequent showers, often heralding the approach of autumn. This wet month, alongside May and August, creates a pattern where substantial rainfall can lead to lush greenery but also poses a risk for flooding. Overall, September's precipitation underscores the city's transition into the wetter season, setting the stage for a more temperate fall.
As summer wanes and autumn approaches, September in Houston experiences a slight uptick in humidity, averaging around 73%. This marks a subtle transition from the peak summer lows of 68% in August, reflecting a gradual shift in atmospheric conditions. Throughout the year, humidity levels in Houston tend to fluctuate, typically peaking in the winter months with January and February at 78% and 81% respectively, and surging to a notable 84% by December. Despite September’s modest rise, it remains significantly lower than the winter highs, indicating that while the air begins to feel more humid, the intense tropical humidity of summer is finally easing. Overall, September serves as a bridge between the sweltering heat and the crisp breezes of fall, making it a transitional yet comfortable month for residents.
As summer fades into fall, September in Houston still shines brightly with a UV Index of 10, placing it in the very high exposure category. This reflects a slight decrease from the extreme levels experienced in the peak summer months of June to August, but it's a reminder that sun safety remains crucial. With a burn time of just 15 minutes, residents should stay vigilant, applying sunscreen and seeking shade during peak hours. Notably, the UV Index remains elevated as we transition into October, suggesting that while the intensity may diminish, the need for sun protection is far from over. For more details on how to stay safe from harmful UV rays, check out Houston UV Index.
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As summer begins to wane, September brings a delightful transition in Houston, where sunshine continues to grace the city with 278 hours of radiant light. This month sits comfortably in the latter half of the year, showcasing a significant amount of sunshine, just below the peak summer months of July and August. The trend here is clear: after the sweltering highs of summer, September offers a more tempered warmth, inviting residents and visitors alike to enjoy the outdoors. Although it experiences a slight dip compared to the previous two months, the sunshine remains abundant, heralding the onset of fall with an inviting glow. As the year progresses toward its end, Houston’s sun-drenched September sets the stage for the cooler, crisper days ahead, making it a perfect time to embrace the beauty of the Texas landscape.
In September, Houston enjoys a notable resurgence in sunny days, with a 47% chance of sunshine that mirrors the brighter months of January and early autumn. This percentage stands out favorably against the backdrop of the summer months, where chances of sun dip into the mid-20s to low-30s. As the city transitions from the sweltering heat of summer, September marks a shift towards a more promising outlook for clear skies, setting the stage for pleasant outdoor activities and vibrant sunsets. With the likelihood of sun increasing further into October at 51%, it's clear that this month serves as a bridge to the more favorable weather that follows, making it an ideal time for residents and visitors alike to soak up the sun in Houston.
As summer transitions into fall, September in Houston offers a pleasant shift in daylight duration, providing about 12 hours of sunshine each day. This marks a gradual decline from the longer days of summer, peaking at 14 hours in June and settling back to 11 hours by October. With the days getting shorter, residents can enjoy the softer light of early autumn, creating a perfect backdrop for outdoor activities and evening gatherings. The steady daylight hours from spring through summer emphasize a comforting rhythm in Houston's annual cycle, ultimately leading into the cozier months of late fall and winter.
As September rolls in, Houston experiences a subtle shift in its wind patterns, with the average wind speed reaching 2.5 m/s (6 mph). This marks a slight uptick from the summer months, which are characterized by their languid breezes, peaking in July with just 2.1 m/s (5 mph). The drop in wind speed seen during the summer likely contributed to the humid, stifling atmosphere often felt in the city. In contrast, September brings a refreshing kiss of wind, hinting at the transition towards the more temperate autumn months ahead. This gentle breeze, although still on the lighter side compared to the earlier winter months, offers a welcome reprieve from the heat, setting the stage for Houston's delightful seasonal changes.
The weather in Houston changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Houston and find detailed weather information for every month.
In September, the weather is characterized by warm temperatures, with average highs reaching up to 37°C (99°F) and humidity levels around 73%. This month also sees considerable precipitation, averaging 202 mm (8.0 in) over approximately 15 days. In contrast, January brings much cooler conditions, with temperatures ranging from a minimum of -7°C (19°F) to an average of 13°C (55°F). While January has less rainfall, totaling around 91 mm (3.6 in) over 9 days, the humidity rises slightly to 78%. This stark contrast highlights how September’s summery heat is replaced by the winter chill of January. For more details, you can check out the Houston weather in January.
September and February present starkly contrasting weather patterns. In September, temperatures soar with a minimum of 13°C (55°F) and an average high reaching 37°C (99°F), making it one of the warmest months of the year. Nonetheless, this month also experiences considerable humidity at 73% and significant rainfall, totaling 202 mm (8.0 in) over 15 days. In contrast, February brings a chill to the air, with temperatures dipping as low as -12°C (11°F) at night and averaging around 14°C (58°F) during the day. Precipitation is lighter in February with 95 mm (3.8 in) over 14 days, and humidity slightly higher at 81%. For a deeper look into February's climate specifics, you can explore Houston weather in February.
September and March present contrasting weather patterns. In September, temperatures range from a minimum of 13°C (55°F) to a scorching maximum of 37°C (99°F), with an average of 27°C (80°F). The month is also quite wet, experiencing 202 mm (8.0 in) of precipitation over 15 days and maintaining high humidity at 73%. In contrast, March features a cooler climate, with temperatures dipping as low as -1°C (31°F) and reaching a maximum of 30°C (87°F), resulting in an average temperature of 19°C (66°F). Additionally, March sees significantly less rainfall at 86 mm (3.4 in) across 13 days, accompanied by a slightly higher humidity at 76%. For more details on the weather in Houston specifically during this month, check out Houston weather in March.
September and April present contrasting weather profiles. In September, temperatures soar with a minimum of 13°C (55°F) and averages peaking at 27°C (80°F), reaching a maximum of 37°C (99°F). This month also experiences significant rainfall, totaling 202 mm (8.0 in) over 15 days, paired with a humidity level of 73%. In contrast, April enjoys milder conditions, with a minimum temperature of 4°C (39°F) and an average of 21°C (70°F), peaking at 32°C (90°F). Rainfall is notably less in April at 94 mm (3.7 in) over 11 days, and the humidity is slightly higher at 79%. For a more detailed look at April weather, visit Houston weather in April.
When comparing the weather in September and May, September tends to be warmer with average temperatures peaking at 27°C (80°F) and reaching highs of 37°C (99°F). In contrast, May sees cooler averages of 25°C (77°F) and maximums of 34°C (93°F). September also experiences greater rainfall, with 202 mm (8.0 in) over 15 days, compared to May's 176 mm (6.9 in) over 16 days. Additionally, humidity levels are slightly lower in September at 73%, while May has a higher humidity of 79%. For more detailed insights, check out Houston weather in May.
When comparing September and June weather, September generally experiences slightly lower temperatures, with an average of 27°C (80°F) and a maximum of 37°C (99°F), compared to June's minimum of 18°C (65°F) and average of 28°C (82°F). Additionally, September tends to be wetter, with 202 mm (8.0 in) of precipitation over 15 days, while June sees 171 mm (6.7 in) over 17 days. Both months exhibit high humidity, but September's humidity is marginally lower at 73% compared to June's 74%. For more detailed information, you can check Houston weather in June.
In September, the weather is characterized by slightly lower minimum temperatures, averaging 13°C (55°F), compared to the warmer minimum of 20°C (68°F) in July. Both months experience the same maximum temperature of 37°C (99°F), but September tends to be more humid, with an average humidity of 73% versus July's 71%. Precipitation is significantly higher in September, with 202 mm (8.0 in) over 15 days, while July sees 146 mm (5.8 in) across 16 days. For a detailed look at the weather patterns, you can check out Houston weather in July.
In comparing the weather of September and August, September experiences a broader temperature range, with minimum temperatures dropping to 13°C (55°F) compared to August's warmer minimum of 21°C (70°F). While the average temperature in September is slightly lower at 27°C (80°F) than August's 29°C (84°F), both months see similarly high maximum temperatures, although August reaches up to 38°C (100°F) while September peaks at 37°C (99°F). Precipitation levels are quite similar, with September recording 202 mm (8.0 in) over 15 days and August accumulating 201 mm (7.9 in) over 19 days, indicating a wet month as well. Humidity is slightly higher in September at 73% compared to August's 68%, contributing to a more muggy feel. For more details on August weather, check Houston weather in August.
In September, the weather tends to be warmer, featuring a minimum temperature of 13°C (55°F) and an average high of 37°C (99°F). The month is marked by significant rainfall, with 202 mm (8.0 in) of precipitation spread over 15 days, contributing to a humidity level of 73%. In contrast, October sees a noticeable drop in temperatures, with a minimum of 2°C (37°F) and an average temperature of 22°C (73°F). Although the maximum temperature can reach 34°C (93°F), the overall precipitation decreases to 104 mm (4.1 in) over 12 days, resulting in a slightly higher humidity of 75%. For more details on October's weather, you can check Houston weather in October.
In September, the weather is characterized by warm temperatures, with a minimum of 13°C (55°F) and an average high of 27°C (80°F), peaking at 37°C (99°F). The month also experiences significant precipitation, totaling 202 mm (8.0 in) over 15 days, coupled with a humidity level of 73%. In contrast, November sees a notable drop in temperatures, with minimums dropping to -1°C (30°F) and an average high of 17°C (63°F), reaching up to 31°C (88°F). Precipitation is lighter at 82 mm (3.2 in) over just 10 days, and humidity increases slightly to 78%. Overall, the transition from September to November reflects a shift from the heat and humidity of late summer to the cooler, drier conditions of late autumn. For more details, you can check Houston weather in November.
September and December present a striking contrast in weather. September boasts warmer temperatures with a minimum of 13°C (55°F) and an average high of 27°C (80°F), peaking at a scorching 37°C (99°F). The month also experiences significant rainfall, totaling 202 mm (8.0 in) over about 15 days, along with a humidity level of 73%. In contrast, December features a cooler climate, with temperatures ranging from a chilly minimum of -2°C (29°F) to a more moderate average of 14°C (58°F) and a maximum of 28°C (83°F). Precipitation is lighter, with 111 mm (4.4 in) spread over 9 days, and humidity rises slightly to 84%. For more detailed information, check out Houston weather in December.
September in Houston brings a distinct transition as summer's sweltering heat begins to wane, yet it holds onto the warmth with average temperatures lingering around a pleasant 27°C (80°F). This month stands out for its notable humidity level of 73% and the increased likelihood of rain, with around 15 days seeing precipitation. The bounty of moisture contributes to lush greenery while also hinting at the impending changes of autumn, making it a significant month in the yearly weather cycle. For a deeper dive into Houston's climate dynamics, explore Houston Climate.