Brownsville weather in September: Brownsville, Texas: normal highs, lows, rain and records for September
Brownsville in September has a normal high of 92°F and a normal low of 75°F, a daily mean of 83°F, falling from 95°F on the 1st to 90°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 5.73 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 24°C, 146 mm of precipitation in September.
- NOAA stationBrownsville S Padre Island International Airport
- Station IDUSW00012919
- Location25.92°N 97.42°W
- Elevation23 ft (7 m)
- From the center6 miles
- Population191,967
- Jan 73° 53°
- Feb 76° 57°
- Mar 81° 62°
- Apr 86° 68°
- May 90° 74°
- Jun 94° 77°
- Jul 95° 78°
- Aug 96° 78°
- Sep 92° 75°
- Oct 87° 69°
- Nov 80° 61°
- Dec 74° 55°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Brownsville in September?
The normal high is 92°F and the normal low 75°F, for a daily mean of 83.4°F. September is 3.6°F cooler than August and 5.5°F warmer than October. September is the 4th warmest month of the year in Brownsville and the wettest. Across the month the normal high falls 5°F, from 95°F on September 1 to 90°F on September 30. From one year to the next September's mean temperature typically moves about 1.3°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 82°F and 85°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 95°F | 77°F | 32% | 21% |
| September 8 | 93°F | 76°F | 35% | 23% |
| September 15 | 92°F | 75°F | 35% | 24% |
| September 22 | 91°F | 74°F | 34% | 23% |
| September 30 | 90°F | 72°F | 30% | 20% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 95°F | 77°F | 32% | 21% | 12 h 40 min |
| September 2 | 94°F | 77°F | 33% | 21% | 12 h 40 min |
| September 3 | 94°F | 77°F | 33% | 22% | 12 h 40 min |
| September 4 | 94°F | 76°F | 34% | 22% | 12 h 40 min |
| September 5 | 94°F | 76°F | 34% | 22% | 12 h 40 min |
| September 6 | 94°F | 76°F | 34% | 23% | 12 h 30 min |
| September 7 | 94°F | 76°F | 35% | 23% | 12 h 30 min |
| September 8 | 93°F | 76°F | 35% | 23% | 12 h 30 min |
| September 9 | 93°F | 76°F | 35% | 23% | 12 h 30 min |
| September 10 | 93°F | 76°F | 35% | 23% | 12 h 30 min |
| September 11 | 93°F | 76°F | 35% | 23% | 12 h 30 min |
| September 12 | 93°F | 75°F | 36% | 23% | 12 h 20 min |
| September 13 | 93°F | 75°F | 36% | 24% | 12 h 20 min |
| September 14 | 92°F | 75°F | 36% | 24% | 12 h 20 min |
| September 15 | 92°F | 75°F | 35% | 24% | 12 h 20 min |
| September 16 | 92°F | 75°F | 35% | 23% | 12 h 20 min |
| September 17 | 92°F | 75°F | 35% | 23% | 12 h 20 min |
| September 18 | 92°F | 74°F | 35% | 23% | 12 h 20 min |
| September 19 | 92°F | 74°F | 35% | 23% | 12 h 10 min |
| September 20 | 91°F | 74°F | 34% | 23% | 12 h 10 min |
| September 21 | 91°F | 74°F | 34% | 23% | 12 h 10 min |
| September 22 | 91°F | 74°F | 34% | 23% | 12 h 10 min |
| September 23 | 91°F | 74°F | 33% | 22% | 12 h 10 min |
| September 24 | 91°F | 73°F | 33% | 22% | 12 h 10 min |
| September 25 | 91°F | 73°F | 32% | 22% | 12 h 10 min |
| September 26 | 91°F | 73°F | 32% | 21% | 12 h |
| September 27 | 91°F | 73°F | 32% | 21% | 12 h |
| September 28 | 90°F | 73°F | 31% | 21% | 12 h |
| September 29 | 90°F | 73°F | 31% | 20% | 12 h |
| September 30 | 90°F | 72°F | 30% | 20% | 12 h |
- Normal high
- 92°FSeptember average
- Normal low
- 75°FSeptember average
- Precipitation
- 5.73 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 22
- Daylight
- 12 h 40 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 30
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012919; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Brownsville in September?
On a given September day the chance of 0.01 inch or more is 34% on average, highest around September 12 (36%). In all, 5.73 in falls on 11 days of a normal September, 2 of them with an inch or more.
In a normal September in Brownsville, 22 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012919.
How humid and windy is Brownsville in September?
At 3 p.m. the normal temperature is 86°F with 58% relative humidity and a dew point of 70°F; at 6 a.m. it is 72°F with 92% humidity. The wind averages 7.7 mph, most often from the east in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 72°F | 70°F | 92% | 4.7 mph | 74% |
| 9 a.m. | 81°F | 72°F | 74% | 9.0 mph | 69% |
| noon | 86°F | 70°F | 59% | 11.1 mph | 43% |
| 3 p.m. | 86°F | 70°F | 58% | 12.5 mph | 63% |
| 6 p.m. | 81°F | 70°F | 70% | 10.1 mph | 79% |
| 9 p.m. | 76°F | 71°F | 83% | 5.8 mph | 86% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00012919. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Brownsville?
The warmest September temperature on Brownsville's official record (since 1878) is 105°F, on September 5, 2000; the coldest is 51°F, on September 29, 1896. The wettest September brought 30.57 in (1886).
The September mean against the 1991-2020 normal of 83.4°F: 2021 84.3°F (+0.9), 2022 83.5°F (at normal), 2023 88.5°F (+5.1), 2024 83.7°F (+0.3), 2025 85.2°F (+1.8), 2026 89.8°F (+6.3). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 84.3°F | +0.9°F | 4.64 in |
| 2022 | 83.5°F | at normal | 4.56 in |
| 2023 | 88.5°F | +5.1°F | 0.02 in |
| 2024 | 83.7°F | +0.3°F | 10.75 in |
| 2025 | 85.2°F | +1.8°F | 3.64 in |
| 2026 | 89.8°F | +6.3°F | 1.46 in |
Source: records: ACIS, NWS threaded record BROthr; recent months: ACIS, station USW00012919. Records and recent months use complete months only.
How does September in Brownsville compare across Texas?
Across the 321 places PlainClimate covers in Texas, September normal highs run from 81°F in Hart to 95°F in Presidio; Brownsville's is 92°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.