Brownsville, TX weather in September
Expect hot, oppressively humid weather with frequent rain in Brownsville in September, with highs near 92°F and lows near 75°F. Rain falls on about 11 days. Plan outdoor time for mornings and evenings.
- Normal high
- 92°F
- Normal low
- 75°F
- Wet days
- 11
- 5.7 in total
- Muggy days
- 28
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 95°F | 90°F |
| Normal low | 77°F | 72°F |
| Chance of a wet day | 34% | 32% |
| Sunrise / sunset | 7:10 am / 7:49 pm | 7:21 am / 7:18 pm |
| Daylight | 12.7 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 am75°Fdew point 73°F
- 9 am83°Fdew point 74°F
- Noon88°Fdew point 72°F
- 3 pm88°Fdew point 72°F
- 6 pm84°Fdew point 73°F
- 9 pm79°Fdew point 74°F
NOAA hourly normals (local standard time) from Brownsville (5 mi away); average wind 8 mph; clear or few clouds in 63% of daytime hours, mostly cloudy or overcast in 21%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 30
- Hot dayshigh 90°F or more22 of 30
- Muggy daysdaily mean dew point 65°F or more28 of 30
- Wet daysat least 0.01 in of rain or melted snow11 of 30
- Notable rainat least 0.10 in8 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 5.7 in; a dry September brings about 3.6 in and a wet one about 7.8 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 95°F
- Coolest September1991: average high 88°F
- Wettest September2003: 15.1 in
- Driest September2000: 0.7 in
- Highest reading105°F (September 5, 2000)
- Lowest reading55°F (September 22, 1995)
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 | 96°F | 92°F | 87°F |
| Normal low | 78°F | 75°F | 69°F |
| Wet days | 6 | 11 | 8 |
| Comfortable days | 0 | 0 | 2 |
| Daylight | 13.0 h | 12.3 h | 11.5 h |
Highs change by -4°F from August and -5°F into October.
Nearby alternatives in September
- Drier: McAllen, TX50 mi · high 94°F · 8 wet days
How Brownsville ranks in September
- Normal high22nd warmest of 378 cities; 4th of 38 in Texas
- Wet days340th driest of 378
- Comfortable days311th most of 342
What to pack for Brownsville in September
- Light, breathable clothing – highs near 92°F and about 28 muggy days
- A rain jacket or umbrella – rain on about 11 days
Heating and cooling
September has 0 heating degree days and 554 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Brownsville in September?
The normal high is 92°F and the normal low is 75°F. From 1991 to 2020 the hottest September reading was 105°F (September 5, 2000).
Does it rain a lot in Brownsville in September?
About 11 days in September have at least 0.01 in of precipitation, and the normal total is 5.7 in. The wettest September in 1991-2020 was in 2003 (15.1 in); the driest was in 2000 (0.7 in).
Is September a good time to visit Brownsville?
September ranks 12th of 12 months on our comfort score for Brownsville (33 out of 100). It has almost no comfortable days and about 22 days at 90°F or hotter. The best months are January, February and December.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: Brownsville (USW00012919), 5.0 mi E of the city center, 23 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Port Isabel (USC00417179), 18 mi NE of the city center, 17 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Mcallen Miller Intl Airport (USW00012959), 51 mi WNW of the city center, 100 ft (65 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Brownsville/S Padre Island Intl Airport (722500-12919), 4.7 mi E of the city center, 19 ft . Hourly observations, 1991-2020.