Last updated: June 24, 2025
In New Castle, United States, the average temperature in May hovers around 17°C (64°F), making it a pleasant time of year. However, be prepared for a range of temperatures, as they can dip as low as -1°C (30°F) or soar up to 31°C (89°F). Precipitation is fairly frequent, with around 147 mm (5.8 in) expected over 13 days, contributing to the average humidity of a muggy 83%. Whether you're reveling in the warmth or dodging showers, this month offers a unique experience in New Castle!
In May in New Castle, the average temperature is 17°C (64°F), with maximums reaching 31°C (89°F) and minimums dropping as low as -1°C (30°F). This variety in temperature makes it essential to pack for both warm and cool conditions when traveling.
In New Castle in May, the total precipitation amount is 147 mm (5.8 in), which occurs over a span of 13 days.
In New Castle in May, humidity is 83%. With an average temperature of 17°C (64°F), this humidity feels like a warm, heavy blanket wrapping around you, making travel feel sluggish and prompting you to seek the nearest shade or air-conditioned escape.
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 | 2°C (35°F) | 73 mm (2.9 inches) | 87% | moderate |
| February Weather | 5°C (41°F) | 111 mm (4.4 inches) | 87% | high |
| March Weather | 7°C (46°F) | 82 mm (3.2 inches) | 86% | very high |
| April Weather | 12°C (55°F) | 120 mm (4.7 inches) | 84% | very high |
| May Weather | 17°C (64°F) | 147 mm (5.8 inches) | 83% | very high |
| June Weather | 21°C (70°F) | 117 mm (4.6 inches) | 83% | extreme |
| July Weather | 24°C (75°F) | 78 mm (3.1 inches) | 79% | extreme |
| August Weather | 23°C (73°F) | 109 mm (4.3 inches) | 66% | very high |
| September Weather | 20°C (68°F) | 114 mm (4.5 inches) | 68% | very high |
| October Weather | 15°C (58°F) | 114 mm (4.5 inches) | 78% | high |
| November Weather | 6°C (44°F) | 75 mm (3.0 inches) | 89% | moderate |
| December Weather | 4°C (39°F) | 98 mm (3.9 inches) | 86% | moderate |