nomadseason

April Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States, the average temperature in April hovers around 17°C (64°F). Expect temperatures to range from a chilly 1°C (34°F) to a warm 32°C (89°F). With an average precipitation of 140 mm (5.5 in) spread over 8 days, the air tends to be quite humid, averaging around 82%. Make sure to prepare accordingly for a mix of cool breezes and warm sunshine!

April Temperature in Helena

In April in Helena, the average temperature is 17°C (64°F). Maximums can reach 32°C (89°F), while minimums can drop as low as 1°C (34°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

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 17°C (64°F), with highs reaching up to 32°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec475358637277808077685350
Data source: Temperature data for Helena generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in Helena

In Helena in April, the precipitation amount is 140 mm (5.5 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 140 mm (5.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1121551341401081471231228513283142
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

April Humidity in Helena

In Helena in April, humidity is 82%. With an average temperature of 17°C (64°F), this humidity feels like a damp embrace that can make traveling quite uncomfortable, as the sticky air clings to your skin and leaves you yearning for a cool breeze.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
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 Weather8°C (47°F)112 mm (4.4 inches)85%moderate
February Weather11°C (53°F)155 mm (6.1 inches)84%high
March Weather15°C (59°F)134 mm (5.3 inches)82%very high
April Weather17°C (64°F)140 mm (5.5 inches)82%very high
May Weather22°C (73°F)108 mm (4.2 inches)81%extreme
June Weather25°C (78°F)147 mm (5.8 inches)77%extreme
July Weather27°C (81°F)122 mm (4.8 inches)77%extreme
August Weather26°C (80°F)122 mm (4.8 inches)72%extreme
September Weather25°C (77°F)85 mm (3.3 inches)73%very high
October Weather20°C (68°F)132 mm (5.2 inches)73%very high
November Weather12°C (54°F)83 mm (3.3 inches)85%high
December Weather10°C (50°F)142 mm (5.6 inches)88%moderate

Compare Helena's Climate with Cities Worldwide