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March Weather in Longmont, United States

Last updated: June 24, 2025

In March, the average temperature in Longmont, United States hovers around 5°C (40°F). This month can be quite varied, with temperatures ranging from a chilly -23°C (-9°F) to a warm 27°C (80°F). Expect 56 mm (2.2 in) of precipitation, spread across about 9 days, and a notable average humidity level of 75%, contributing to the overall climate experience.

March Temperature in Longmont

In March in Longmont, the average temperature is 5°C (40°F). Maximum temperatures can reach 27°C (80°F) and minimums can drop as low as -23°C (-9°F). This wide temperature range makes Longmont an ideal destination for travelers who enjoy diverse weather conditions and outdoor adventures.

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

The chart illustrates March temperature patterns in Longmont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Longmont, March typically has an average temperature of 5°C (40°F), with highs reaching up to 27°C (80°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec303040485668747266494033
Data source: Temperature data for Longmont 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 Longmont

In Longmont in March, the precipitation amount is 56 mm (2.2 in) over a period of 9 days.

March Precipitation Trends in Longmont

The chart displays monthly precipitation patterns in Longmont, 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 Longmont, March typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1926565511942314327382315
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Longmont

In Longmont in March humidity is 75%. With an average temperature of 5°C (40°F), this humidity feels like a chilly mist enveloping you, making outdoor activities uncomfortable and necessitating layered clothing to stay warm while navigating the damp conditions.

March Average Humidity in Longmont

This chart illustrates the average monthly humidity levels in Longmont, 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 Longmont is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%86%75%67%67%68%62%63%63%72%80%85%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Longmont

In Longmont in March, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Longmont.

Maximum UV Index Levels in Longmont for March

The chart shows the monthly maximum UV Index (UVI) for Longmont 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 Longmont typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46811111212119643
Data source: Longmont 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 Longmont Compares to Other Months

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

This table compares monthly weather conditions in Longmont, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)19 mm (0.8 inches)84%moderate
February Weather-1°C (30°F)26 mm (1.0 inches)85%high
March Weather5°C (40°F)56 mm (2.2 inches)75%very high
April Weather9°C (48°F)55 mm (2.2 inches)67%extreme
May Weather13°C (56°F)119 mm (4.7 inches)67%extreme
June Weather20°C (69°F)42 mm (1.6 inches)68%extreme
July Weather23°C (75°F)31 mm (1.2 inches)62%extreme
August Weather22°C (73°F)43 mm (1.7 inches)63%extreme
September Weather19°C (66°F)27 mm (1.1 inches)63%very high
October Weather9°C (49°F)38 mm (1.5 inches)72%high
November Weather4°C (40°F)23 mm (0.9 inches)79%moderate
December Weather0°C (33°F)15 mm (0.6 inches)85%moderate

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