Last updated: March 2, 2024
The weather in Heidelberg, United States, during April is characterized by an average temperature of 18°C (65°F). Highs can soar to 30°C (86°F), while lows may dip to 4°C (39°F). Typically, the humidity level in Heidelberg throughout April hovers around 78%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In April, Heidelberg averages 127 mm (5.0 inches) of rainfall, typically over the course of 8 rainy days. The month enjoys an average of 12 hours 58 minutes of daylight, with the sun shining for approximately 9 hours 15 minutes each day. Additionally, there is a 49% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In April, the UV Index in Heidelberg 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 | 3 | 6 | 8 | 10 | 11 | 10 | 7 | 5 | 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 | ||||