nomadseason

April Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States, the average temperature in April hovers around 2°C (36°F). However, temperatures can swing widely, with a minimum of -21°C (-5°F) and a maximum of 23°C (73°F). Expect an average precipitation amount of 67 mm (2.7 in) spread over approximately 12 days, accompanied by a consistent humidity level of 78%.

April Temperature in Helena

In April in Helena, the average temperature is 2°C (36°F). The maximum temperature can reach 23°C (73°F), while the minimum can drop as low as -21°C (-5°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 2°C (36°F), with highs reaching up to 23°C (73°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec191629364858666555393021
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 67 mm (2.7 in) over the course of 12 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 67 mm (2.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec2351386788107313444413333
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 78%. With an average temperature of 2°C (36°F), this humidity feels like a biting chill that seeps into your bones, making outdoor travel uncomfortable and necessitating heavy layers to stay warm while navigating the damp air.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%88%83%78%76%78%77%71%68%72%84%91%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689111098532
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 Weather-7°C (20°F)23 mm (0.9 inches)87%moderate
February Weather-9°C (16°F)51 mm (2.0 inches)88%moderate
March Weather-2°C (29°F)38 mm (1.5 inches)83%high
April Weather2°C (36°F)67 mm (2.7 inches)78%very high
May Weather9°C (48°F)88 mm (3.5 inches)76%very high
June Weather14°C (58°F)107 mm (4.2 inches)78%extreme
July Weather19°C (67°F)31 mm (1.2 inches)77%very high
August Weather18°C (65°F)34 mm (1.3 inches)71%very high
September Weather13°C (55°F)44 mm (1.7 inches)68%very high
October Weather4°C (40°F)41 mm (1.6 inches)72%moderate
November Weather-1°C (30°F)33 mm (1.3 inches)84%moderate
December Weather-6°C (21°F)33 mm (1.3 inches)90%low

Compare Helena's Climate with Cities Worldwide