Brownsville Weather in September
Average highs run from 88°F on September 1 to 80°F on September 30, and lows from 67°F to 56°F. Normal precipitation for the month is 3.85 in over about 7 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 85°F
- Average low
- 62°F
- Precipitation
- 3.85 in
- Record high
- 104°FSep 6, 1925
- Record low
- 33°FSep 29, 1942
- Chance of a freeze
- 0%
- Days of 90°F or more
- 7.0
- Daylight
- 12 h 55 min to 11 h 51 min
- Cloud cover
- 44%
- Humidity
- 65%
- Dew point
- 60°F
- Wind
- 7.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 88°F | 67°F | 101°F 1951 | 50°F 1967 | 21% | 0% |
| Sep 2 | 88°F | 67°F | 103°F 1953 | 49°F 1949 | 21% | 0% |
| Sep 3 | 88°F | 67°F | 101°F 1925 | 51°F 1952 | 21% | 0% |
| Sep 4 | 88°F | 66°F | 102°F 1925 | 48°F 1974 | 21% | 0% |
| Sep 5 | 88°F | 66°F | 103°F 1954 | 48°F 1974 | 21% | 0% |
| Sep 6 | 87°F | 66°F | 104°F 1925 | 49°F 1988 | 21% | 0% |
| Sep 7 | 87°F | 66°F | 104°F 1925 | 46°F 1988 | 21% | 0% |
| Sep 8 | 87°F | 65°F | 102°F 1925 | 46°F 1988 | 21% | 0% |
| Sep 9 | 87°F | 65°F | 103°F 1925 | 49°F 1944 | 21% | 0% |
| Sep 10 | 86°F | 65°F | 100°F 1980 | 45°F 1924 | 21% | 0% |
| Sep 11 | 86°F | 64°F | 98°F 1895 | 41°F 1940 | 21% | 0% |
| Sep 12 | 86°F | 64°F | 99°F 1939 | 39°F 1940 | 21% | 0% |
| Sep 13 | 86°F | 63°F | 100°F 1939 | 41°F 1940 | 21% | 0% |
| Sep 14 | 85°F | 63°F | 101°F 1939 | 46°F 1940 | 21% | 0% |
| Sep 15 | 85°F | 63°F | 96°F 1895 | 47°F 1929 | 21% | 0% |
| Sep 16 | 85°F | 62°F | 100°F 1895 | 41°F 1916 | 21% | 0% |
| Sep 17 | 84°F | 62°F | 100°F 1980 | 43°F 1916 | 21% | 0% |
| Sep 18 | 84°F | 61°F | 99°F 1896 | 43°F 1903 | 22% | 0% |
| Sep 19 | 84°F | 61°F | 98°F 1896 | 44°F 1903 | 22% | 0% |
| Sep 20 | 83°F | 61°F | 97°F 1972 | 43°F 1938 | 22% | 0% |
| Sep 21 | 83°F | 60°F | 96°F 1955 | 40°F 1918 | 22% | 0% |
| Sep 22 | 83°F | 60°F | 97°F 1955 | 39°F 1983 | 22% | 0% |
| Sep 23 | 83°F | 59°F | 96°F 1940 | 39°F 1983 | 22% | 0% |
| Sep 24 | 82°F | 59°F | 94°F 1933 | 39°F 1928 | 22% | 0% |
| Sep 25 | 82°F | 59°F | 96°F 1931 | 39°F 1983 | 22% | 0% |
| Sep 26 | 82°F | 58°F | 96°F 1895 | 41°F 1965 | 22% | 0% |
| Sep 27 | 81°F | 58°F | 96°F 1907 | 37°F 1942 | 22% | 0% |
| Sep 28 | 81°F | 57°F | 97°F 1953 | 35°F 1942 | 22% | 0% |
| Sep 29 | 80°F | 57°F | 100°F 1953 | 33°F 1942 | 22% | 0% |
| Sep 30 | 80°F | 56°F | 96°F 1953 | 35°F 1967 | 22% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:29 AM, sunset 7:24 PM
- September 30
- sunrise 6:51 AM, sunset 6:42 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00401145 (Brownsville), public domain. Records: NOAA GHCN-Daily, station USC00402108, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.