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October Weather in Tri-City, United States

Last updated: August 27, 2025

In October, the average temperature in Tri-City, United States hovers around 11°C (52°F). However, temperatures can swing dramatically, with a minimum of -3°C (27°F) and a maximum reaching 29°C (85°F). Expect around 67 mm (2.6 in) of precipitation over approximately 9 days, accompanied by an average humidity of 77%. Stay prepared for the diverse weather this month!

October Temperature in Tri-City

In October in Tri-City, the average temperature is 11°C (52°F), with maximums reaching up to 29°C (85°F) and minimums dipping as low as -3°C (27°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

October Weather in Tri-City: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Tri-City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tri-City, October typically has an average temperature of 11°C (52°F), with highs reaching up to 29°C (85°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec404044495562686862524539
Data source: Temperature data for Tri-City 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 Tri-City

In Tri-City in October, the total precipitation amount is 67 mm (2.6 in), occurring over a span of 9 days.

October Precipitation Trends in Tri-City

The chart displays monthly precipitation patterns in Tri-City, 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 Tri-City, October typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1401751241126131286167107140
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Tri-City

In Tri-City in October humidity is 77%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable if not properly dressed, as the moisture in the air amplifies the cold, leaving travelers feeling cooler than expected.

October Average Humidity in Tri-City

This chart illustrates the average monthly humidity levels in Tri-City, 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 Tri-City is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Tri-City

In Tri-City in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Tri-City, you can refer to this Hourly UV Index in Tri-City.

Maximum UV Index Levels in Tri-City for October

The chart shows the monthly maximum UV Index (UVI) for Tri-City 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 Tri-City typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098632
Data source: Tri-City 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 Tri-City Compares to Other Months

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

This table compares monthly weather conditions in Tri-City, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (40°F)140 mm (5.5 inches)84%moderate
February Weather4°C (40°F)175 mm (6.9 inches)85%moderate
March Weather7°C (44°F)124 mm (4.9 inches)86%high
April Weather10°C (49°F)112 mm (4.4 inches)83%very high
May Weather13°C (55°F)61 mm (2.4 inches)83%very high
June Weather17°C (62°F)31 mm (1.2 inches)83%very high
July Weather20°C (68°F)2 mm (0.1 inches)78%very high
August Weather20°C (68°F)8 mm (0.3 inches)67%very high
September Weather17°C (62°F)61 mm (2.4 inches)66%very high
October Weather11°C (52°F)67 mm (2.6 inches)77%high
November Weather7°C (45°F)107 mm (4.2 inches)87%moderate
December Weather4°C (39°F)140 mm (5.5 inches)87%low

Compare Tri-City's Climate with Cities Worldwide