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April Weather in Helena, United States

Last updated: June 24, 2025

In April, the average temperature in Helena, United States hovers around 15°C (59°F). However, temperatures can range from a chilly -6°C (22°F) to a sweltering 36°C (97°F). Expect 82 mm (3.2 in) of precipitation spread over about 8 days, contributing to an average humidity of 70%. Be prepared for a diverse climate experience!

April Temperature in Helena

In April in Helena, the average temperature is 15°C (59°F). Maximum temperatures can reach 36°C (97°F), while the minimum can drop as low as -6°C (22°F). Be prepared for a wide range of weather conditions when traveling to Helena during this time.

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

The chart illustrates April 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, April typically has an average temperature of 15°C (59°F), with highs reaching up to 36°C (97°F) and lows dropping to around -6°C (22°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.

April Precipitation in Helena

In Helena in April, the total precipitation amount reached 82 mm (3.2 in) over the course of 8 days.

April Precipitation Trends in Helena

The chart displays monthly precipitation patterns in Helena, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Helena, April typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec35247782143112456959862129
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Helena

In Helena in April, humidity is 70%. With an average temperature of 15°C (59°F), this humidity feels like a warm embrace, making it slightly uncomfortable while traveling, as the moist air clings to your skin and can leave you feeling slightly lethargic.

April Average Humidity in Helena

This chart illustrates the average monthly humidity levels in Helena, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Helena is approximately 70%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Helena

In Helena in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Helena.

Maximum UV Index Levels in Helena for April

The chart shows the monthly maximum UV Index (UVI) for Helena in April, 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 April, the maximum UV index in Helena typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
Data source: Helena April 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 April 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 April’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 April’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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