Early autumn · Weather & things to do
Downtown Houston in September
Downtown Houston cools off: highs slip to 89°F (32°C), from 94°F in August, with lows of 70°F (21°C) and about 4.6 in (118 mm) of rain.
Our comfort score puts it mid-table at 63/100, 9th of 12.
- Avg high
- 89°F (32°C)
- Avg low
- 70°F (21°C)
- Rain
- 4.6 in (118 mm)
- Humidity
- 75%
- Cloud cover
- 44%
- Daylight
- ~12 h 10 min
- Comfort score
- 63/100 · Good
What September feels like
Expect proper heat: afternoons average 89°F (32°C), so plan walking and hiking for the morning and save midday for shade, lunch or a swim.
Nights cool to an average low of 70°F (21°C).
With 75% average humidity, it feels muggy.
Showers are part of the month, adding up to about 4.6 in (118 mm).
Plan around September
September sits mid-table; the best months are February & March and November & December.
- Inside the wettest three-month stretch, August – October.
- Humidity season begins: 75% on average, up from 72% in August.
- Comfort improves from 53/100 in August to 63/100.
- Our Houston New Year's Eve route is planned for Dec 30 – Jan 1, a window set by the holiday season rather than the weather — September falls outside it.
What to pack for September
- Light, breathable clotheshighs average 89°F
- Sunscreen, sunglasses and a hatstrong sun this month
- Refillable water bottleeasy to dehydrate in the heat
- Quick-dry fabrics75% average humidity
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost picks involve some walking
What to do in Downtown Houston in September
Start early and take shelter at midday: the picks below pair morning outings with places to cool off.
Discovery Green
A 12-acre park between the convention center and the skyline, with a lake, lawns and a seasonal ice rink.
Why now September scores 63/100 for comfort, good conditions for being outside.
Buffalo Bayou Park
Trails along the bayou west of downtown; the Eleanor Tinsley lawn and the Sabine Street Bridge frame the classic skyline view.
Why now Highs near 89°F and 4.6 in of monthly rain make this an easy outdoor pick.
Vic & Anthony's Steakhouse
A dark-wood downtown steakhouse across from Daikin Park, a long-running choice for a big-night dinner.
Why now One to do outside while the weather is on your side.
La Carafe
A candlelit wine bar in the Kennedy Bakery building on Market Square, probably the oldest Houston building on its original site.
Why now Go early — afternoons average 89°F.
Nearby in September
- Austin in September~146 mi · highs 90°F, 3.4 in rain · similar daytime temperatures, drier
- San Antonio in September~189 mi · highs 90°F, 3.7 in rain · similar daytime temperatures, drier
- Texas Hill Country in September~200 mi · highs 88°F, 3.4 in rain · similar daytime temperatures, drier
- Dallas in September~225 mi · highs 90°F, 3.0 in rain · similar daytime temperatures, drier
These averages also cover Hermann Park & Museum District.
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Downtown Houston in September: quick answers
Is September a good time to visit Downtown Houston?
It's middling, scoring 63/100. The best months are February & March and November & December, at up to 88. Expect highs of 89°F (32°C) and 4.6 in (118 mm) of rain.
How hot is Downtown Houston in September?
Average highs are 89°F (32°C) and average lows 70°F (21°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Downtown Houston in September?
Some: about 4.6 in (118 mm) of rain falls across September on average, the 5th-wettest month of the year. The annual total is about 49.1 in (1246 mm).
What should I pack for Downtown Houston in September?
Bring light, breathable clothes (highs average 89°F), sunscreen, sunglasses and a hat (strong sun this month), refillable water bottle (easy to dehydrate in the heat), quick-dry fabrics (75% average humidity) and packable rain jacket or umbrella (a shower or two is likely).
More on Downtown Houston
Planning Downtown Houston in September?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.