What September feels like in Houston
In Houston, September brings early autumn. Expect proper heat in the afternoon — slow down between noon and four. Once the sun goes down the air changes: nights stay warm. Thick, humid air means clothes cling and the heat feels stronger than the number.
Rain in Houston in September
Rain is part of normal life this month, falling on about one day in 2. Rain tends to come in heavy bursts: about 11.7 mm (0.5 in) on an average rainy day. That is close to Houston's typical rain per wet day for the whole year (about 10.9 mm). It is among the three wettest months of the year.
Daylight and sunshine in September
Mid-month, Houston gets 12 h 23 min of daylight, from sunrise near 7:05 am to sunset near 7:28 pm. Days are getting shorter: 52 min less daylight than in mid-August. Measured sunshine covers about 81% of the daylight — skies are mostly clear.
How September compares to the rest of the year
In Houston's temperature order, September sits as the 4th warmest month. Afternoons run 2.6°C (4.7°F) cooler than in August, with 23 mm more rain. Temperatures keep falling into October. October averages a high of 27.4°C (81.3°F).
Who September suits
- Sightseeing: a good fit — comfortable enough to explore on foot all day.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
Tips for visiting Houston in September
Rain Protection
Keep a small umbrella in your bag and wear shoes that cope with puddles.
Sun Protection
Loose, breathable clothing plus sunscreen and a wide-brimmed hat.
Quick questions
How warm is Houston in September?
Afternoons average 31°C (87.8°F) and nights about 22.5°C (72.5°F) — hot by most people's standards. It is the 4th warmest month of the year.
Does it rain a lot in Houston in September?
It does: about 13 rainy days bring roughly 152 mm, so plan some indoor options.
What should I wear in Houston in September?
The numbers point to rain protection and sun protection. Evenings feel similar to the day, so the same clothes work from morning to night.
Is September or October better for visiting Houston?
On our 12-month climate ranking, October comes out ahead (#3 of 12 vs #9). October is cooler and has fewer rainy days.