Last updated: June 24, 2025
In New Castle, United States, the average temperature in May hovers around 17°C (64°F). Be prepared for a broad temperature range, with minimums dipping to -1°C (30°F) and maximums soaring up to 32°C (91°F). This month also sees about 140 mm (5.5 in) of precipitation, spread across roughly 15 days, and an average humidity level of 79%. Whether you love the warm sun or cozy rain, there's a bit of everything this season!
In May in New Castle, the average temperature is 17°C (64°F). The maximum can reach 32°C (91°F), and the minimum can be as low as -1°C (30°F). Be prepared for a wide range of temperatures when traveling, as you'll experience both warm days and chilly nights.
In New Castle in May, the total precipitation amount is 140 mm (5.5 in) over a span of 15 days.
In New Castle in May humidity is 79%. With an average temperature of 17°C (64°F), this humidity feels like a warm blanket wrapped around you, making outdoor activities feel a bit muggy and requiring frequent hydration as you explore the sights.
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.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 78 mm (3.1 inches) | 87% | moderate |
| February Weather | 0°C (33°F) | 99 mm (3.9 inches) | 85% | moderate |
| March Weather | 5°C (42°F) | 120 mm (4.7 inches) | 86% | high |
| April Weather | 11°C (51°F) | 99 mm (3.9 inches) | 84% | very high |
| May Weather | 17°C (64°F) | 140 mm (5.5 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 120 mm (4.7 inches) | 82% | extreme |
| July Weather | 24°C (76°F) | 112 mm (4.4 inches) | 79% | very high |
| August Weather | 23°C (73°F) | 93 mm (3.7 inches) | 70% | very high |
| September Weather | 20°C (69°F) | 89 mm (3.5 inches) | 69% | very high |
| October Weather | 14°C (57°F) | 101 mm (4.0 inches) | 76% | high |
| November Weather | 5°C (41°F) | 93 mm (3.7 inches) | 88% | moderate |
| December Weather | 2°C (35°F) | 81 mm (3.2 inches) | 87% | moderate |