Monthly climate guide
Houston weather in September
Expect very hot weather in Houston in September: afternoons reach about 33°C (91°F), while nights drop to around 22°C (71°F). Around 118 mm of rain falls over the month (wet), and skies are a mix of sun and cloud. Daytime highs are 3°C cooler than August and 4°C warmer than October.
What stands out in September
- Temperatures are falling — expect highs around 4°C lower by October.
- It's humid — around 74% — so the heat feels heavier.
- In Houston, September is early autumn.
- Houston is usually about 3°C warmer than New Orleans, 510 km away, in September.
Avg high
33°C
91°F
Avg low
22°C
71°F
Rainfall
118 mm
wet
Humidity
74%
relative
Sky
45%
cloud · a mix of sun and cloud
Houston weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 17°C / 62°F | 5°C / 41°F | 93 mm | 80% | 58% |
| February | 19°C / 67°F | 8°C / 46°F | 64 mm | 81% | 66% |
| March | 23°C / 74°F | 12°C / 53°F | 85 mm | 79% | 62% |
| April | 27°C / 80°F | 15°C / 59°F | 93 mm | 76% | 56% |
| May | 31°C / 87°F | 19°C / 67°F | 147 mm | 74% | 52% |
| June | 34°C / 93°F | 23°C / 74°F | 116 mm | 73% | 45% |
| July | 35°C / 94°F | 24°C / 75°F | 87 mm | 72% | 44% |
| August | 36°C / 97°F | 24°C / 76°F | 136 mm | 69% | 43% |
| September | 33°C / 91°F | 22°C / 71°F | 118 mm | 74% | 45% |
| October | 29°C / 83°F | 16°C / 61°F | 103 mm | 74% | 34% |
| November | 22°C / 72°F | 11°C / 51°F | 73 mm | 77% | 50% |
| December | 18°C / 65°F | 7°C / 45°F | 101 mm | 81% | 63% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Houston?
Compare the months in the chart above to find your ideal window.
Best time to visit Houston →Other United States cities in September
Cite or embed this data
Writing about this destination? Copy a ready-made citation or embed a live widget — free, just keep the link.
Houston weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/houston/september
<a href="https://weathercompare.eu/weather/usa/houston/september">Houston weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/houston" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Houston weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/houston/september">Houston weather in September</a> – WeatherCompare</p>
Houston in September: quick answers
Is September a good time to visit Houston?
It can be, if you like heat: September highs in Houston are around 33°C. Good for the beach; plan sightseeing for early morning and evening.
How warm is Houston in September?
Average highs are about 33°C (91°F) and average lows about 22°C (71°F), based on 10 years of daily data.
Does it rain a lot in Houston in September?
Houston typically gets around 118 mm of rain in September — wet.
Figures are long-term averages for the area around Houston (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.