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March Weather in Potomac, United States

Last updated: June 24, 2025

In Potomac, United States, the average temperature in March hovers around 6°C (43°F). Expect a chilly atmosphere where temperatures can dip as low as -18°C (0°F) and peak at a warm 26°C (79°F). With an average precipitation of 111 mm (4.4 in) over 11 days, the region experiences a fair amount of rain, contributing to a notable average humidity of 84%.

March Temperature in Potomac

In March in Potomac, the average temperature is 6°C (43°F), with maximums reaching 26°C (79°F) and minimums dropping as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures, so it's essential to pack layers to stay comfortable throughout their visit.

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

The chart illustrates March temperature patterns in Potomac, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Potomac, March typically has an average temperature of 6°C (43°F), with highs reaching up to 26°C (79°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec283142526474777470574135
Data source: Temperature data for Potomac 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 Potomac

In Potomac in March, the precipitation amount is 111 mm (4.4 in), occurring over the course of 11 days.

March Precipitation Trends in Potomac

The chart displays monthly precipitation patterns in Potomac, 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 Potomac, March typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec777711111814711287110761197459
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Potomac

In Potomac in March, humidity is 84%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that penetrates your clothing, making outdoor excursions uncomfortable and prompting travelers to seek refuge indoors or find warm, sheltered spots to enjoy their surroundings.

March Average Humidity in Potomac

This chart illustrates the average monthly humidity levels in Potomac, 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 Potomac is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Potomac

In Potomac 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 Potomac, you can refer to this Hourly UV Index in Potomac.

Maximum UV Index Levels in Potomac for March

The chart shows the monthly maximum UV Index (UVI) for Potomac 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 Potomac typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Potomac 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 Potomac Compares to Other Months

Weather in Potomac varies notably across the year, with each month offering distinct climate conditions. This page compares March’s weather to other months in Potomac, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Potomac, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)77 mm (3.0 inches)82%moderate
February Weather-1°C (31°F)77 mm (3.0 inches)83%moderate
March Weather6°C (43°F)111 mm (4.4 inches)84%high
April Weather11°C (52°F)118 mm (4.6 inches)85%very high
May Weather18°C (65°F)147 mm (5.8 inches)79%very high
June Weather23°C (74°F)112 mm (4.4 inches)82%extreme
July Weather25°C (77°F)87 mm (3.4 inches)80%very high
August Weather23°C (74°F)110 mm (4.3 inches)81%very high
September Weather21°C (70°F)76 mm (3.0 inches)80%very high
October Weather14°C (57°F)119 mm (4.7 inches)82%high
November Weather5°C (41°F)74 mm (2.9 inches)88%moderate
December Weather2°C (36°F)59 mm (2.3 inches)84%low

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