April Weather in Heidelberg

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%.

4°C (39°F)

Minimum temperature

18°C (65°F)

Average temperature

30°C (86°F)

Maximum temperature

78%

Humidity

Precipitation and Sunshine hours

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.

127 mm (5.0 inches)

Precipitation

8 rainy days

Rainy days

9 hours 15 minutes

Sunshine hours

49%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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

Compare Heidelberg's Climate with Cities Worldwide