Last updated: March 2, 2024
The weather in Gretna, United States, during May is characterized by an average temperature of 25°C (77°F). Highs can soar to 31°C (88°F), while lows may dip to 17°C (64°F). Typically, the humidity level in Gretna throughout May hovers around 77%.
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Average temperature
Maximum temperature
Humidity
In May, Gretna averages 144 mm (5.7 inches) of rainfall, typically over the course of 13 rainy days. The month enjoys an average of 13 hours 39 minutes of daylight, with the sun shining for approximately 10 hours 19 minutes each day. Additionally, there is a 37% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In May, the UV Index in Gretna 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 | 1 | 2 | 4 | 6 | 9 | 11 | 12 | 11 | 8 | 6 | 3 | 1 | 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 | ||||