Last updated: June 24, 2025
In May, the average temperature in Londonderry, United States hovers around 13°C (55°F). Visitors should be prepared for a temperature range, with minimums dipping to -2°C (29°F) and maximums soaring up to 32°C (89°F). Expect a fair amount of rain, with precipitation totaling 103 mm (4.0 in) across approximately 14 days. Additionally, the average humidity is around 76%, creating a muggy atmosphere that adds to the region's unique charm.
In May in Londonderry, the average temperature is 13°C (55°F), with maximums reaching 32°C (89°F) and minimums dropping as low as -2°C (29°F). This variation in temperature makes it essential for travelers to pack layers to stay comfortable throughout the day.
In Londonderry in May, the precipitation amount is 103 mm (4.0 in) over a span of 14 days.
In Londonderry in May humidity is 76%. With an average temperature of 13°C (55°F), this humidity feels like a damp, heavy blanket enveloping you, making it feel cooler than it actually is, which can be quite refreshing for short excursions but may also lead to discomfort during prolonged outdoor activities.
In Londonderry 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 Londonderry.
UV Risk Categories
Weather in Londonderry varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Londonderry, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 78 mm (3.1 inches) | 89% | moderate |
| February Weather | -5°C (24°F) | 91 mm (3.6 inches) | 88% | moderate |
| March Weather | -1°C (31°F) | 78 mm (3.1 inches) | 86% | high |
| April Weather | 6°C (43°F) | 131 mm (5.2 inches) | 84% | very high |
| May Weather | 13°C (55°F) | 103 mm (4.0 inches) | 76% | very high |
| June Weather | 18°C (64°F) | 114 mm (4.5 inches) | 72% | very high |
| July Weather | 21°C (69°F) | 163 mm (6.4 inches) | 66% | very high |
| August Weather | 20°C (67°F) | 120 mm (4.7 inches) | 64% | very high |
| September Weather | 16°C (61°F) | 95 mm (3.7 inches) | 72% | high |
| October Weather | 9°C (49°F) | 157 mm (6.2 inches) | 81% | high |
| November Weather | 1°C (35°F) | 107 mm (4.2 inches) | 87% | moderate |
| December Weather | -4°C (26°F) | 105 mm (4.1 inches) | 84% | low |