Last updated: March 2, 2024
The weather in Lewisville, United States, during September is characterized by an average temperature of 23°C (73°F). Highs can soar to 34°C (93°F), while lows may dip to 11°C (52°F). Typically, the humidity level in Lewisville throughout September hovers around 75%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Lewisville averages 136 mm (5.4 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 21 minutes of daylight, with the sun shining for approximately 9 hours 23 minutes each day. Additionally, there is a 55% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Lewisville reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 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 | 1 | 1 | 2 | 4 | 6 | 8 | 9 | 9 | 7 | 5 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||