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March Weather in Cornwall, United States

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%.

March Temperature in Cornwall

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.

March Weather in Cornwall: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Cornwall, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cornwall, March typically has an average temperature of 4°C (39°F), with highs reaching up to 25°C (78°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec303339496069757366564234
Data source: Temperature data for Cornwall generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

March Precipitation in Cornwall

In Cornwall in March, the precipitation amount is 88 mm (3.5 in) spread over a duration of 10 days.

March Precipitation Trends in Cornwall

The chart displays monthly precipitation patterns in Cornwall, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Cornwall, March typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6995881181199512912111514190102
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Cornwall

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.

March Average Humidity in Cornwall

This chart illustrates the average monthly humidity levels in Cornwall, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Cornwall is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Cornwall

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.

Maximum UV Index Levels in Cornwall for March

The chart shows the monthly maximum UV Index (UVI) for Cornwall in March, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In March, the maximum UV index in Cornwall typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Cornwall March UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How March Weather in Cornwall Compares to Other Months

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.

This table compares monthly weather conditions in Cornwall, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)69 mm (2.7 inches)84%moderate
February Weather1°C (33°F)95 mm (3.7 inches)82%moderate
March Weather4°C (39°F)88 mm (3.5 inches)81%high
April Weather10°C (50°F)118 mm (4.6 inches)78%very high
May Weather15°C (60°F)119 mm (4.7 inches)69%very high
June Weather20°C (69°F)95 mm (3.7 inches)69%very high
July Weather24°C (75°F)129 mm (5.1 inches)62%very high
August Weather23°C (73°F)121 mm (4.8 inches)65%very high
September Weather19°C (67°F)115 mm (4.5 inches)68%very high
October Weather14°C (57°F)141 mm (5.5 inches)74%high
November Weather6°C (42°F)90 mm (3.5 inches)82%moderate
December Weather1°C (35°F)102 mm (4.0 inches)80%low

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