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October Weather in Hermiston, United States

Last updated: June 24, 2025

In Hermiston, United States, the average temperature in October hovers around 12°C (54°F), with a minimum dip to -8°C (19°F) and peaks reaching up to 32°C (89°F). Expect 29 mm (1.1 in) of precipitation over 6 days, and enjoy an average humidity level of 75%.

October Temperature in Hermiston

In October in Hermiston, the average temperature is 12°C (54°F). The maximum can reach 32°C (89°F), while the minimum can drop as low as -8°C (19°F). This diverse range in temperatures makes Hermiston an exciting destination for travelers seeking varied weather experiences.

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

The chart illustrates October temperature patterns in Hermiston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hermiston, October typically has an average temperature of 12°C (54°F), with highs reaching up to 32°C (89°F) and lows dropping to around -8°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec363846546472807968544337
Data source: Temperature data for Hermiston 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 Hermiston

In Hermiston in October, the precipitation amount is 29 mm (1.1 in) over the course of 6 days.

October Precipitation Trends in Hermiston

The chart displays monthly precipitation patterns in Hermiston, 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 Hermiston, October typically receives around 29 mm (1.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec4054403117100512293940
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Hermiston

In Hermiston in October, humidity is 75%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill that seeps into your bones, making it essential to layer your clothing for comfort while exploring.

October Average Humidity in Hermiston

This chart illustrates the average monthly humidity levels in Hermiston, 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 Hermiston is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Hermiston

In Hermiston in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Hermiston.

Maximum UV Index Levels in Hermiston for October

The chart shows the monthly maximum UV Index (UVI) for Hermiston 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 Hermiston typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101097532
Data source: Hermiston 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 Hermiston Compares to Other Months

Weather in Hermiston varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Hermiston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Hermiston, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)40 mm (1.6 inches)86%low
February Weather3°C (38°F)54 mm (2.1 inches)86%moderate
March Weather8°C (46°F)40 mm (1.6 inches)85%high
April Weather12°C (54°F)31 mm (1.2 inches)83%high
May Weather18°C (64°F)17 mm (0.7 inches)77%very high
June Weather22°C (72°F)10 mm (0.4 inches)81%very high
July Weather27°C (80°F)0 mm (0.0 inches)76%very high
August Weather26°C (79°F)5 mm (0.2 inches)60%very high
September Weather20°C (68°F)12 mm (0.5 inches)58%high
October Weather12°C (54°F)29 mm (1.1 inches)75%moderate
November Weather6°C (44°F)39 mm (1.6 inches)85%moderate
December Weather3°C (37°F)40 mm (1.6 inches)87%low

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