Last updated: March 2, 2024
The weather in Gretna, United States, during September is characterized by an average temperature of 26°C (79°F). Highs can soar to 35°C (95°F), while lows may dip to 17°C (62°F). Typically, the humidity level in Gretna throughout September hovers around 83%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Gretna averages 140 mm (5.5 inches) of rainfall, typically over the course of 13 rainy days. The month enjoys an average of 12 hours 18 minutes of daylight, with the sun shining for approximately 9 hours 56 minutes each day. Additionally, there is a 39% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Gretna reaches a maximum of 10, 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 | 0 | 1 | 2 | 4 | 6 | 8 | 10 | 10 | 8 | 6 | 4 | 2 | 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 | ||||||