Last updated: June 24, 2025
In March, the average temperature in Cornwall, United States hovers around 4°C (39°F). Expect a wide range, with minimums dipping as low as -15°C (6°F) and maximums reaching 25°C (78°F). During this month, precipitation amounts to approximately 88 mm (3.5 in) spread over 10 days, while humidity remains high at an average of 81%.
In March in Cornwall, the average temperature is 4°C (39°F), with maximums reaching up to 25°C (78°F) and minimums dropping as low as -15°C (6°F). Be prepared for a wide range of temperatures while exploring the diverse climate of Cornwall.
In Cornwall in March, the precipitation amount is 88 mm (3.5 in) spread over a duration of 10 days.
In Cornwall in March, humidity is 81%. With an average temperature of 4°C (39°F), this humidity feels like a chilling dampness that penetrates even the warmest layers of clothing, making outdoor exploration uncomfortable and prompting travelers to seek refuge indoors.
In Cornwall in March, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Cornwall, you can refer to this Hourly UV Index in Cornwall.
UV Risk Categories
Weather in Cornwall varies notably across the year, with each month offering distinct climate conditions. This page compares March’s weather to other months in Cornwall, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -1°C (31°F) | 69 mm (2.7 inches) | 84% | moderate |
February Weather | 1°C (33°F) | 95 mm (3.7 inches) | 82% | moderate |
March Weather | 4°C (39°F) | 88 mm (3.5 inches) | 81% | high |
April Weather | 10°C (50°F) | 118 mm (4.6 inches) | 78% | very high |
May Weather | 15°C (60°F) | 119 mm (4.7 inches) | 69% | very high |
June Weather | 20°C (69°F) | 95 mm (3.7 inches) | 69% | very high |
July Weather | 24°C (75°F) | 129 mm (5.1 inches) | 62% | very high |
August Weather | 23°C (73°F) | 121 mm (4.8 inches) | 65% | very high |
September Weather | 19°C (67°F) | 115 mm (4.5 inches) | 68% | very high |
October Weather | 14°C (57°F) | 141 mm (5.5 inches) | 74% | high |
November Weather | 6°C (42°F) | 90 mm (3.5 inches) | 82% | moderate |
December Weather | 1°C (35°F) | 102 mm (4.0 inches) | 80% | low |