March Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States, the average temperature in March is a mild 14°C (57°F). You can expect minimums dipping to -6°C (22°F), while highs can reach up to 29°C (85°F). Prepare for approximately 172 mm (6.8 in) of precipitation over 14 days and enjoy the typically high average humidity of 81%.

March Temperature in Helena

In March in Helena, the average temperature is 14°C (57°F), with maximums reaching 29°C (85°F) and minimums dipping as low as -6°C (22°F). It's advisable to pack accordingly for a mix of warm and cool weather during your travels.

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 14°C (57°F), with highs reaching up to 29°C (85°F) and lows dropping to around -6°C (22°F).

Data source: Temperature data for Helena generated using information from the Copernicus Climate Change Service.

March Precipitation in Helena

In Helena in March, the total precipitation amount is 172 mm (6.8 in) spread over a duration of 14 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 172 mm (6.8 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

March Humidity in Helena

In Helena in March, humidity is 81%. With an average temperature of 14°C (57°F), this humidity feels like a warm, dense blanket that clings to your skin, making outdoor exploration a bit heavier and more tiring.

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 81%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (44°F)	107 mm (4.2 inches)	84%	moderate
February Weather	9°C (48°F)	185 mm (7.3 inches)	83%	high
March Weather	14°C (57°F)	172 mm (6.8 inches)	81%	very high
April Weather	17°C (62°F)	146 mm (5.7 inches)	81%	very high
May Weather	23°C (73°F)	138 mm (5.5 inches)	83%	extreme
June Weather	26°C (79°F)	133 mm (5.2 inches)	83%	extreme
July Weather	28°C (82°F)	124 mm (4.9 inches)	81%	extreme
August Weather	27°C (81°F)	114 mm (4.5 inches)	74%	very high
September Weather	25°C (77°F)	92 mm (3.6 inches)	71%	very high
October Weather	19°C (66°F)	111 mm (4.4 inches)	76%	high
November Weather	11°C (52°F)	82 mm (3.2 inches)	84%	high
December Weather	9°C (49°F)	144 mm (5.7 inches)	88%	moderate