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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 20°C (68°F), with a comfortable minimum of 5°C (41°F) and a pleasant maximum reaching 31°C (88°F). Expect 120 mm (4.7 in) of precipitation spread over about 10 days, contributing to an average humidity level of 78%. Prepare for a month that balances warm days with refreshing breezes!

April Temperature in Helena

In April in Helena, the average temperature is 20°C (68°F). Maximum temperatures can reach 31°C (88°F), while minimums can dip as low as 5°C (41°F). This means you can enjoy mild weather, but it's wise to pack for both warm days and cooler evenings while traveling.

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 (68°F), with highs reaching up to 31°C (88°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec535964687580828279736056
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 precipitation amount is 120 mm (4.7 in) spread over a duration of 10 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 120 mm (4.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec901048712013224617921815513456109
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 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

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.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%78%73%71%79%78%80%76%83%87%
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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110864
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 Weather12°C (53°F)90 mm (3.5 inches)82%moderate
February Weather15°C (59°F)104 mm (4.1 inches)80%very high
March Weather18°C (64°F)87 mm (3.4 inches)80%very high
April Weather20°C (68°F)120 mm (4.7 inches)78%extreme
May Weather24°C (76°F)132 mm (5.2 inches)73%extreme
June Weather27°C (81°F)246 mm (9.7 inches)71%extreme
July Weather28°C (82°F)179 mm (7.0 inches)79%extreme
August Weather28°C (82°F)218 mm (8.6 inches)78%extreme
September Weather26°C (79°F)155 mm (6.1 inches)80%very high
October Weather23°C (73°F)134 mm (5.3 inches)76%very high
November Weather15°C (60°F)56 mm (2.2 inches)83%high
December Weather14°C (57°F)109 mm (4.3 inches)87%moderate

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