Last updated: March 2, 2024
The weather in Herculaneum, United States, during April is characterized by an average temperature of 13°C (56°F). Highs can soar to 29°C (84°F), while lows may dip to -1°C (31°F). Typically, the humidity level in Herculaneum throughout April hovers around 80%.
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Average temperature
Maximum temperature
Humidity
In April, Herculaneum averages 137 mm (5.4 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 13 hours 12 minutes of daylight, with the sun shining for approximately 7 hours 59 minutes each day. Additionally, there is a 49% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In April, the UV Index in Herculaneum reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 3 | 5 | 7 | 9 | 9 | 8 | 7 | 4 | 2 | 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 | ||||||