Houston, TX weather in September
September in Houston: hot and oppressively humid, with some rain. Highs 89°F, lows 73°F, rain on about 10 days.
- Normal high
- 89°F
- Normal low
- 73°F
- Wet days
- 10
- 5.8 in total
- Muggy days
- 24
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 92°F | 87°F |
| Normal low | 76°F | 69°F |
| Chance of a wet day | 35% | 27% |
| Sunrise / sunset | 6:58 am / 7:44 pm | 7:14 am / 7:08 pm |
| Daylight | 12.8 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am72°Fdew point 69°F
- 9 am80°Fdew point 70°F
- Noon86°Fdew point 68°F
- 3 pm87°Fdew point 67°F
- 6 pm83°Fdew point 69°F
- 9 pm77°Fdew point 70°F
NOAA hourly normals (local standard time) from Houston Intercont Airport (15 mi away); average wind 6 mph; clear or few clouds in 24% of daytime hours, mostly cloudy or overcast in 44%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 30
- Hot dayshigh 90°F or more16 of 30
- Muggy daysdaily mean dew point 65°F or more24 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 5.8 in; a dry September brings about 3.2 in and a wet one about 8.5 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202011: average high 94°F
- Coolest September2003: average high 86°F
- Wettest September2020: 13.1 in
- Driest September2005: 1.5 in
- Highest reading108°F (September 4, 2000)
- Lowest reading53°F (September 26, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 94°F | 89°F | 82°F |
| Normal low | 77°F | 73°F | 64°F |
| Wet days | 10 | 10 | 7 |
| Comfortable days | 0 | 1 | 7 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -5°F from August and -7°F into October.
Nearby alternatives in September
- Drier: Conroe, TX38 mi · high 90°F · 7 wet days
How Houston ranks in September
- Normal high66th warmest of 378 cities; 21st of 38 in Texas
- Wet days303rd driest of 378
- Comfortable days290th most of 342
What to pack for Houston in September
- Light, breathable clothing – highs near 89°F and about 24 muggy days
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 0 heating degree days and 483 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Houston in September?
The normal high is 89°F and the normal low is 73°F. From 1991 to 2020 the hottest September reading was 108°F (September 4, 2000).
Does it rain a lot in Houston in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 5.8 in. The wettest September in 1991-2020 was in 2020 (13.1 in); the driest was in 2005 (1.5 in).
Is September a good time to visit Houston?
September ranks 10th of 12 months on our comfort score for Houston (38 out of 100). It has about 1 comfortable day and about 16 days at 90°F or hotter. The best month is March.
Where the numbers come from
- Temperature, rain and frost dates: Houston Hobby Airport (USW00012918), 9.9 mi SSE of the city center, 44 ft . NOAA normals and daily records, 1991-2020.
- Snowfall, snow depth, humidity and wind by hour and cloud cover: Houston Intercont Airport (USW00012960), 15 mi N of the city center, 95 ft (59 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: G Bush Intercontinental Airport/Houston Airport (722430-12960), 15 mi N of the city center, 90 ft (54 ft higher than the city). Hourly observations, 1991-2020.