Last updated: June 24, 2025
In May, the average temperature in Old Greenwich, United States is 15°C (60°F). You can expect a range from a minimum of 2°C (36°F) to a maximum of 31°C (87°F). With an average precipitation of 112 mm (4.4 in) over 12 days, it's a month to prepare for a bit of rain! Humidity hovers around 69%, making for a pleasantly mild atmosphere.
In May in Old Greenwich, the average temperature is 15°C (60°F). Maximums can reach 31°C (87°F), while minimums can be as low as 2°C (36°F). It's a great time to visit Old Greenwich if you enjoy mild weather with a chance of warmer days!
In Old Greenwich in May, the total precipitation amount is 112 mm (4.4 in), falling over the course of 12 days.
In Old Greenwich in May, humidity is 69%. With an average temperature of 15°C (60°F), this humidity feels like a cool, damp embrace that can make outdoor activities feel slightly heavier and more exhausting, but still inviting for exploring the charming sights and sounds of the area.
In Old Greenwich 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 Old Greenwich.
UV Risk Categories
Weather in Old Greenwich varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Old Greenwich, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 1°C (34°F) | 69 mm (2.7 inches) | 84% | moderate |
February Weather | 2°C (36°F) | 101 mm (4.0 inches) | 82% | moderate |
March Weather | 5°C (41°F) | 93 mm (3.7 inches) | 81% | high |
April Weather | 10°C (50°F) | 116 mm (4.6 inches) | 78% | very high |
May Weather | 15°C (60°F) | 112 mm (4.4 inches) | 69% | very high |
June Weather | 21°C (70°F) | 93 mm (3.7 inches) | 69% | very high |
July Weather | 25°C (77°F) | 139 mm (5.5 inches) | 62% | very high |
August Weather | 24°C (75°F) | 118 mm (4.6 inches) | 65% | very high |
September Weather | 21°C (69°F) | 93 mm (3.6 inches) | 68% | very high |
October Weather | 15°C (60°F) | 131 mm (5.2 inches) | 74% | high |
November Weather | 8°C (47°F) | 90 mm (3.6 inches) | 82% | moderate |
December Weather | 3°C (39°F) | 113 mm (4.5 inches) | 80% | low |