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April Weather in Herculaneum, United States

Last updated: June 24, 2025

In Herculaneum, United States, the average temperature in April is a comfortable 13°C (56°F). However, temperatures can swing dramatically, with a minimum of -4°C (25°F) and a maximum of 31°C (89°F). You can expect about 137 mm (5.4 in) of precipitation spread over 12 days, contributing to an average humidity level of 80%.

April Temperature in Herculaneum

In April in Herculaneum, the average temperature is 13°C (56°F), with maximums reaching up to 31°C (89°F) and minimums dropping as low as -4°C (25°F). Be prepared for a wide range of temperatures during your travels, ensuring you pack accordingly for both warm and chilly conditions.

April Weather in Herculaneum: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Herculaneum, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Herculaneum, April typically has an average temperature of 13°C (56°F), with highs reaching up to 31°C (89°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec333648556776797672594540
Data source: Temperature data for Herculaneum generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in Herculaneum

In Herculaneum in April, the precipitation amount is 137 mm (5.4 in) that occurs over the course of 12 days.

April Precipitation Trends in Herculaneum

The chart displays monthly precipitation patterns in Herculaneum, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Herculaneum, April typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec77841321371438889124691047162
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Herculaneum

In Herculaneum in April humidity is 80%. With average temperature 13°C (56°F) this humidity feels like a damp chill that seeps into your bones, making outdoor exploration more challenging and necessitating layered clothing for comfort.

April Average Humidity in Herculaneum

This chart illustrates the average monthly humidity levels in Herculaneum, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Herculaneum is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Herculaneum

In Herculaneum in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Herculaneum.

Maximum UV Index Levels in Herculaneum for April

The chart shows the monthly maximum UV Index (UVI) for Herculaneum in April, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In April, the maximum UV index in Herculaneum typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109753
Data source: Herculaneum April UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How April Weather in Herculaneum Compares to Other Months

Weather in Herculaneum varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Herculaneum, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Herculaneum, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)77 mm (3.0 inches)82%moderate
February Weather2°C (37°F)84 mm (3.3 inches)80%moderate
March Weather9°C (48°F)132 mm (5.2 inches)80%high
April Weather13°C (56°F)137 mm (5.4 inches)80%very high
May Weather19°C (67°F)143 mm (5.6 inches)82%very high
June Weather24°C (76°F)88 mm (3.5 inches)83%extreme
July Weather26°C (80°F)89 mm (3.5 inches)81%very high
August Weather25°C (76°F)124 mm (4.9 inches)80%very high
September Weather22°C (72°F)68 mm (2.7 inches)76%very high
October Weather15°C (59°F)104 mm (4.1 inches)76%high
November Weather7°C (45°F)71 mm (2.8 inches)85%moderate
December Weather4°C (40°F)62 mm (2.5 inches)86%moderate

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