Last updated: March 2, 2024
The weather in Harlingen, United States, during September is characterized by an average temperature of 28°C (83°F). Highs can soar to 37°C (100°F), while lows may dip to 20°C (68°F). Typically, the humidity level in Harlingen throughout September hovers around 73%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Harlingen averages 114 mm (4.5 inches) of rainfall, typically over the course of 15 rainy days. The month enjoys an average of 12 hours 15 minutes of daylight, with the sun shining for approximately 9 hours 38 minutes each day. Additionally, there is a 57% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Harlingen 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 | 3 | 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 | ||||