Last updated: March 2, 2024
The weather in Port Isabel, United States, during September is characterized by an average temperature of 28°C (82°F). Highs can soar to 30°C (87°F), while lows may dip to 24°C (76°F). Typically, the humidity level in Port Isabel throughout September hovers around 77%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Port Isabel averages 136 mm (5.3 inches) of rainfall, typically over the course of 17 rainy days. The month enjoys an average of 12 hours 15 minutes of daylight, with the sun shining for approximately 9 hours 45 minutes each day. Additionally, there is a 56% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Port Isabel reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 0 | 1 | 2 | 4 | 7 | 10 | 11 | 11 | 9 | 6 | 4 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | ||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | ||||