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May Weather in New Castle, United States

Last updated: June 24, 2025

In New Castle, United States, the average temperature in May is a comfortable 19°C (67°F). However, temperatures can range from a chilly 0°C (32°F) to a warm 32°C (90°F). Expect 126 mm (5.0 in) of precipitation over about 15 days, contributing to an average humidity of 79%. 🌧️

May Temperature in New Castle

In May in New Castle, the average temperature is 19°C (67°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as 0°C (32°F). Be prepared for a range of weather, from warm days to chilly nights, making it a great time to explore.

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 19°C (67°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec353947556774787571604540
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 precipitation amount is 126 mm (5.0 in) spread over 15 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 126 mm (5.0 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec871291391431261591039911510692111
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 79%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit more challenging, as the air is thick and can leave you feeling sluggish during outdoor adventures.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108743
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 Weather1°C (35°F)87 mm (3.4 inches)87%moderate
February Weather4°C (39°F)129 mm (5.1 inches)85%moderate
March Weather8°C (47°F)139 mm (5.5 inches)86%high
April Weather13°C (56°F)143 mm (5.6 inches)84%very high
May Weather19°C (67°F)126 mm (5.0 inches)79%very high
June Weather23°C (74°F)159 mm (6.3 inches)82%very high
July Weather25°C (78°F)103 mm (4.0 inches)79%very high
August Weather24°C (76°F)99 mm (3.9 inches)70%very high
September Weather22°C (71°F)115 mm (4.5 inches)69%very high
October Weather15°C (60°F)106 mm (4.2 inches)76%high
November Weather7°C (45°F)92 mm (3.6 inches)88%moderate
December Weather5°C (40°F)111 mm (4.4 inches)87%moderate

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