October Weather in Chehalis, United States

Last updated: June 24, 2025

In October, the average temperature in Chehalis, United States hovers around 10°C (51°F). Expect a range that dips to a chilly -3°C (27°F) at its lowest and can rise up to a pleasant 24°C (76°F) at its peak. During this month, you can anticipate 132 mm (5.2 in) of precipitation spread over 13 days, contributing to a relatively high average humidity of 83%.

October Temperature in Chehalis

In October in Chehalis, the average temperature is 10°C (51°F). The maximum can reach 24°C (76°F), and the minimum can be as low as -3°C (27°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates October temperature patterns in Chehalis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chehalis, October typically has an average temperature of 10°C (51°F), with highs reaching up to 24°C (76°F) and lows dropping to around -3°C (27°F).

Data source: Temperature data for Chehalis generated using information from the Copernicus Climate Change Service.

October Precipitation in Chehalis

In Chehalis in October, the precipitation amount is 132 mm (5.2 in) over the course of 13 days.

October Precipitation Trends in Chehalis

The chart displays monthly precipitation patterns in Chehalis, 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 Chehalis, October typically receives around 132 mm (5.2 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

October Humidity in Chehalis

In Chehalis in October, humidity is 83%. With an average temperature of 10°C (51°F), this humidity feels like a chilly dampness that permeates your clothes, making it essential to dress in layers for travel, as the cool air combined with the high humidity can create an uncomfortable and bone-chilling atmosphere.

October Average Humidity in Chehalis

This chart illustrates the average monthly humidity levels in Chehalis, 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 Chehalis is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Chehalis

In Chehalis 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 Chehalis.

Maximum UV Index Levels in Chehalis for October

The chart shows the monthly maximum UV Index (UVI) for Chehalis 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 Chehalis typically reaches 5, which falls under the moderate exposure category.

Data source: Chehalis 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 Chehalis Compares to Other Months

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

This table compares monthly weather conditions in Chehalis, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	186 mm (7.3 inches)	86%	low
February Weather	4°C (40°F)	169 mm (6.7 inches)	84%	moderate
March Weather	7°C (45°F)	137 mm (5.4 inches)	85%	moderate
April Weather	10°C (49°F)	119 mm (4.7 inches)	83%	high
May Weather	13°C (56°F)	71 mm (2.8 inches)	84%	very high
June Weather	16°C (60°F)	54 mm (2.1 inches)	84%	very high
July Weather	18°C (65°F)	12 mm (0.5 inches)	82%	very high
August Weather	19°C (66°F)	15 mm (0.6 inches)	73%	very high
September Weather	16°C (61°F)	88 mm (3.5 inches)	74%	high
October Weather	10°C (51°F)	132 mm (5.2 inches)	83%	moderate
November Weather	7°C (45°F)	181 mm (7.1 inches)	86%	moderate
December Weather	5°C (40°F)	198 mm (7.8 inches)	87%	low