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March Weather in Boulder, United States

Last updated: June 24, 2025

In March, the average temperature in Boulder, United States hovers around -2°C (28°F), with minimums plummeting to -30°C (-21°F) and maximums reaching a moderate 15°C (59°F). Expect 40 mm (1.6 in) of precipitation spread over 11 days, contributing to an average humidity of 83%. Prepare for a chilly yet captivating atmosphere!

March Temperature in Boulder

In March in Boulder, the average temperature is -2°C (28°F), with maximums reaching up to 15°C (59°F) and minimums dropping as low as -30°C (-21°F). It's essential to prepare for cold weather and varying conditions if you plan to travel during this month.

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

The chart illustrates March temperature patterns in Boulder, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boulder, March typically has an average temperature of -2°C (28°F), with highs reaching up to 15°C (59°F) and lows dropping to around -30°C (-21°F).
JanFebMarAprMayJunJulAugSepOctNovDec181528344657656354382718
Data source: Temperature data for Boulder 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 Boulder

In Boulder in March, the precipitation amount is 40 mm (1.6 in) spread over a duration of 11 days.

March Precipitation Trends in Boulder

The chart displays monthly precipitation patterns in Boulder, 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 Boulder, March typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec2356406892112443943443432
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Boulder

In Boulder in March, humidity is 83%. With an average temperature of -2°C (28°F), this humidity feels like a biting chill that penetrates your clothes, making outdoor activities uncomfortable and travel challenging.

March Average Humidity in Boulder

This chart illustrates the average monthly humidity levels in Boulder, 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 Boulder is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%88%83%78%76%78%77%71%68%72%84%91%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Boulder

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

Maximum UV Index Levels in Boulder for March

The chart shows the monthly maximum UV Index (UVI) for Boulder 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 Boulder typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689111098532
Data source: Boulder 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 Boulder Compares to Other Months

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

This table compares monthly weather conditions in Boulder, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)23 mm (0.9 inches)87%moderate
February Weather-9°C (16°F)55 mm (2.2 inches)88%moderate
March Weather-2°C (28°F)40 mm (1.6 inches)83%high
April Weather1°C (34°F)68 mm (2.7 inches)78%very high
May Weather8°C (46°F)92 mm (3.6 inches)76%very high
June Weather14°C (57°F)112 mm (4.4 inches)78%extreme
July Weather18°C (65°F)44 mm (1.7 inches)77%very high
August Weather17°C (64°F)39 mm (1.5 inches)71%very high
September Weather12°C (54°F)43 mm (1.7 inches)68%very high
October Weather3°C (38°F)44 mm (1.7 inches)72%moderate
November Weather-3°C (28°F)34 mm (1.3 inches)84%moderate
December Weather-8°C (19°F)32 mm (1.3 inches)90%low

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