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Brownsville Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  |  |  |  |  |  | | |  | |
| Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C |
| POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 405 AM EDT Tue Sep 22 2026 
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Issued: 141 AM EDT Tue Sep 22 2026
Key Messages
1) Cooler weather will prevail through the week. More showers will occur tonight into Wednesday.
Discussion
... KEY MESSAGE 1) Inverted surface trough along the Appalachians will sharpen today and then pivot westward across the forecast area tonight into Wednesday in response to a mid level system that will be closing off as it tracks southeast across the region. This will result in showers developing and moving west across the area. Cannot rule out a bit of thunder. Greater coverage o...