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October Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States, the average temperature in October hovers around 16°C (61°F). Visitors can experience a broad range, with minimum temperatures dipping to -3°C (27°F) and maximums soaring to 36°C (97°F). During this month, expect about 86 mm (3.4 in) of precipitation over approximately 8 days, coupled with an average humidity of 72%, creating a unique climate experience.

October Temperature in Helena

In October in Helena, the average temperature is 16°C (61°F), with maximums reaching 36°C (97°F) and minimums dipping as low as -3°C (27°F). Travelers should be prepared for a wide range of temperatures during this time.

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

The chart illustrates October 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, October typically has an average temperature of 16°C (61°F), with highs reaching up to 36°C (97°F) and lows dropping to around -3°C (27°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.

October Precipitation in Helena

In Helena in October, the precipitation amount reaches 86 mm (3.4 in) over the course of 8 days.

October Precipitation Trends in Helena

The chart displays monthly precipitation patterns in Helena, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Helena, October typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec35247782143112456959862129
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Helena

In Helena in October humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.

October Average Humidity in Helena

This chart illustrates the average monthly humidity levels in Helena, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Helena is approximately 72%, 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 October generated using information from the Copernicus Climate Change Service.

October UV Index in Helena

In Helena in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Helena.

Maximum UV Index Levels in Helena for October

The chart shows the monthly maximum UV Index (UVI) for Helena in October, 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 October, the maximum UV index in Helena typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
Data source: Helena October 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 October 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 October’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 October’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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