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May Weather in Herculaneum, United States

Last updated: June 24, 2025

In May, the average temperature in Herculaneum, United States sits at a mild 19°C (67°F), with temperatures ranging from a cool 4°C (39°F) to a warm 33°C (92°F). Expect a fair amount of rain, with 143 mm (5.6 in) of precipitation over approximately 14 days. Additionally, humidity levels are typically high, averaging around 82%, adding to the overall feel of the season.

May Temperature in Herculaneum

In May in Herculaneum, the average temperature is 19°C (67°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 4°C (39°F). This diverse range of temperatures makes Herculaneum a suitable destination for travelers seeking both warm and cooler weather experiences.

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

The chart illustrates May 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, May typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (39°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.

May Precipitation in Herculaneum

In Herculaneum in May, the total precipitation amount is 143 mm (5.6 in), spread over a duration of 14 days.

May Precipitation Trends in Herculaneum

The chart displays monthly precipitation patterns in Herculaneum, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Herculaneum, May typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec77841321371438889124691047162
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Herculaneum

In Herculaneum in May humidity is 82%. With an average temperature of 19°C (67°F), this humidity feels like a heavy blanket wrapping around you, making each step feel sluggish and the air thick as you explore the sights.

May Average Humidity in Herculaneum

This chart illustrates the average monthly humidity levels in Herculaneum, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Herculaneum is approximately 82%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Herculaneum

In Herculaneum in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Herculaneum.

Maximum UV Index Levels in Herculaneum for May

The chart shows the monthly maximum UV Index (UVI) for Herculaneum in May, 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 May, the maximum UV index in Herculaneum typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109753
Data source: Herculaneum May 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 May 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 May’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 May’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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