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March Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States, the average temperature in March hovers around 11°C (52°F). Expect temperature fluctuations, with minimums dipping to -12°C (10°F) and maximums soaring to 33°C (92°F). During this month, precipitation averages 77 mm (3.0 in) over about 8 days, bringing an average humidity of 67% to the area.

March Temperature in Helena

In March in Helena, the average temperature is 11°C (52°F). Maximums can reach 33°C (92°F), while minimums can drop as low as -12°C (10°F). This wide temperature range suggests that travelers should be prepared for both warm days and chilly nights, making layering essential for comfort.

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

The chart illustrates March temperature patterns in Helena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Helena, March typically has an average temperature of 11°C (52°F), with highs reaching up to 33°C (92°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec373852586979838075604841
Data source: Temperature data for Helena 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 Helena

In Helena in March, the precipitation amount is 77 mm (3.0 in) distributed over 8 days.

March Precipitation Trends in Helena

The chart displays monthly precipitation patterns in Helena, 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 Helena, March typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec35247782143112456959862129
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Helena

In Helena in March humidity is 67%. With an average temperature of 11°C (52°F), this humidity feels like a cool, damp embrace that can make you feel chilly and uncomfortable while traveling, especially if you're not dressed appropriately for the moisture in the air.

March Average Humidity in Helena

This chart illustrates the average monthly humidity levels in Helena, 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 Helena is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%67%70%82%82%81%76%67%72%80%83%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Helena

In Helena 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 Helena.

Maximum UV Index Levels in Helena for March

The chart shows the monthly maximum UV Index (UVI) for Helena 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 Helena typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
Data source: Helena 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 Helena Compares to Other Months

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

This table compares monthly weather conditions in Helena, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)35 mm (1.4 inches)75%moderate
February Weather3°C (38°F)24 mm (1.0 inches)76%high
March Weather11°C (52°F)77 mm (3.0 inches)67%very high
April Weather15°C (59°F)82 mm (3.2 inches)70%very high
May Weather20°C (69°F)143 mm (5.6 inches)82%extreme
June Weather26°C (80°F)112 mm (4.4 inches)82%extreme
July Weather28°C (83°F)45 mm (1.8 inches)81%extreme
August Weather27°C (81°F)69 mm (2.7 inches)76%very high
September Weather24°C (76°F)59 mm (2.3 inches)67%very high
October Weather16°C (61°F)86 mm (3.4 inches)72%high
November Weather9°C (49°F)21 mm (0.8 inches)80%moderate
December Weather5°C (42°F)29 mm (1.2 inches)83%moderate

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