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April Weather in Helena, United States

Last updated: June 24, 2025

In April, the average temperature in Helena, United States is a pleasant 20°C (67°F). However, temperatures can vary significantly, dipping as low as 1°C (33°F) and soaring up to 36°C (98°F). With 88 mm (3.4 in) of precipitation spread over about 8 days, you might want to keep an umbrella handy. The average humidity sits at a comfortable 76%, ensuring a mild and enjoyable atmosphere.

April Temperature in Helena

In April in Helena, the average temperature is 20°C (67°F). Maximums can reach 36°C (98°F), while minimums can drop to as low as 1°C (33°F). This diverse temperature range makes Helena an ideal destination for travelers seeking both warm days and cooler evenings.

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 20°C (67°F), with highs reaching up to 36°C (98°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec525761677580838279725854
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 reaches 88 mm (3.4 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 88 mm (3.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec831077888721031181061078953126
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 76%. With an average temperature of 20°C (67°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities slightly sticky and encouraging travelers to stay hydrated while exploring.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
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 Weather11°C (52°F)83 mm (3.2 inches)85%moderate
February Weather14°C (58°F)107 mm (4.2 inches)82%high
March Weather16°C (62°F)78 mm (3.1 inches)80%very high
April Weather20°C (67°F)88 mm (3.4 inches)76%very high
May Weather24°C (76°F)72 mm (2.8 inches)73%extreme
June Weather27°C (80°F)103 mm (4.1 inches)74%extreme
July Weather28°C (83°F)118 mm (4.6 inches)80%extreme
August Weather28°C (82°F)106 mm (4.2 inches)79%extreme
September Weather26°C (80°F)107 mm (4.2 inches)83%very high
October Weather22°C (72°F)89 mm (3.5 inches)77%very high
November Weather14°C (58°F)53 mm (2.1 inches)84%high
December Weather12°C (54°F)126 mm (4.9 inches)88%moderate

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