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May Weather in New Castle, United States

Last updated: June 24, 2025

In May, the average temperature in New Castle, United States hovers around 10°C (50°F). However, don't be surprised by the range—temperatures can dip as low as -7°C (19°F) or soar to 28°C (83°F). With 43 mm (1.7 in) of precipitation spread over 8 days, it’s wise to keep an umbrella handy. Moreover, the average humidity is around 58%, creating an interesting blend of conditions throughout the month.

May Temperature in New Castle

In May in New Castle, the average temperature is 10°C (50°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -7°C (19°F). Be sure to pack layers to prepare for the wide range of temperatures you'll experience while traveling.

May Weather in New Castle: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in New Castle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Castle, May typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (83°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec212533395063706860433121
Data source: Temperature data for New Castle 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 New Castle

In New Castle in May, the total precipitation amount is 43 mm (1.7 in) over the course of 8 days.

May Precipitation Trends in New Castle

The chart displays monthly precipitation patterns in New Castle, 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 New Castle, May typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec557361484418131318604055
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in New Castle

In New Castle in May humidity is 58%. With an average temperature of 10°C (50°F), this humidity feels a bit damp and chilly for traveling, making it important to dress in layers and prepare for a cooler breeze.

May Average Humidity in New Castle

This chart illustrates the average monthly humidity levels in New Castle, 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 New Castle is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%81%74%58%47%39%39%53%72%84%90%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in New Castle

In New Castle in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in New Castle.

Maximum UV Index Levels in New Castle for May

The chart shows the monthly maximum UV Index (UVI) for New Castle 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 New Castle typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469121213121210754
Data source: New Castle 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 New Castle Compares to Other Months

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

This table compares monthly weather conditions in New Castle, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)55 mm (2.2 inches)90%moderate
February Weather-4°C (25°F)73 mm (2.9 inches)89%high
March Weather1°C (33°F)61 mm (2.4 inches)81%very high
April Weather4°C (39°F)48 mm (1.9 inches)74%extreme
May Weather10°C (50°F)43 mm (1.7 inches)58%extreme
June Weather17°C (63°F)18 mm (0.7 inches)47%extreme
July Weather21°C (70°F)13 mm (0.5 inches)39%extreme
August Weather20°C (68°F)13 mm (0.5 inches)39%extreme
September Weather16°C (60°F)18 mm (0.7 inches)53%very high
October Weather6°C (43°F)60 mm (2.4 inches)72%high
November Weather0°C (32°F)39 mm (1.6 inches)84%moderate
December Weather-6°C (22°F)55 mm (2.2 inches)90%moderate

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