Last updated: June 24, 2025
In Brownsville, United States, the average temperature in September hovers around 24°C (75°F), making it a pleasantly warm time of year. However, be prepared for variations, as temperatures can dip as low as 10°C (50°F) and reach highs of 35°C (96°F). Expect some rain, too, with an average precipitation amount of 113 mm (4.5 in) over 7 days, and a comfortable humidity level of 70%. Whether you’re exploring the sights or relaxing outdoors, dress accordingly!
In September in Brownsville, the average temperature is 24°C (75°F). Maximums can reach 35°C (96°F), and minimums can be as low as 10°C (50°F). Overall, this climate makes Brownsville an ideal destination for travelers seeking pleasant weather and a range of outdoor activities.
In Brownsville in September, the total precipitation amount is 113 mm (4.5 in) over a span of 7 days.
In Brownsville in September, humidity is 70%. With an average temperature of 24°C (75°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit sluggish and sticky, ideal for leisurely strolls but requiring plenty of hydration.
In Brownsville in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Brownsville.
UV Risk Categories
Weather in Brownsville varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brownsville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (42°F) | 99 mm (3.9 inches) | 86% | moderate |
| February Weather | 7°C (46°F) | 171 mm (6.7 inches) | 85% | high |
| March Weather | 12°C (55°F) | 166 mm (6.5 inches) | 84% | high |
| April Weather | 16°C (61°F) | 143 mm (5.6 inches) | 81% | very high |
| May Weather | 22°C (71°F) | 103 mm (4.1 inches) | 83% | very high |
| June Weather | 26°C (78°F) | 103 mm (4.1 inches) | 83% | extreme |
| July Weather | 27°C (81°F) | 123 mm (4.9 inches) | 80% | extreme |
| August Weather | 26°C (79°F) | 116 mm (4.6 inches) | 73% | very high |
| September Weather | 24°C (75°F) | 113 mm (4.5 inches) | 70% | very high |
| October Weather | 18°C (64°F) | 111 mm (4.4 inches) | 73% | high |
| November Weather | 10°C (50°F) | 79 mm (3.1 inches) | 85% | moderate |
| December Weather | 8°C (46°F) | 144 mm (5.7 inches) | 88% | moderate |