October Weather in Sumas, United States

Last updated: June 24, 2025

In Sumas, United States, the average temperature in October hovers around 9°C (48°F), with temperatures ranging from a chilly -3°C (28°F) to a mild 23°C (74°F). Expect 229 mm (9.0 in) of precipitation over 16 days, contributing to an average humidity of 88%. Embrace the unique climate as you explore this captivating destination!

October Temperature in Sumas

In October in Sumas, the average temperature is 9°C (48°F). Maximums can reach 23°C (74°F), while minimums can be as low as -3°C (28°F). Be prepared for a range of temperatures to make the most of your travels in this season.

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

The chart illustrates October temperature patterns in Sumas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumas, October typically has an average temperature of 9°C (48°F), with highs reaching up to 23°C (74°F) and lows dropping to around -3°C (28°F).

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

October Precipitation in Sumas

In Sumas in October, the precipitation amount is 229 mm (9.0 in) over a span of 16 days.

October Precipitation Trends in Sumas

The chart displays monthly precipitation patterns in Sumas, 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 Sumas, October typically receives around 229 mm (9.0 inches) of precipitation spread over approximately 16 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 Sumas

In Sumas in October, humidity is 88%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill settling into your bones, making outdoor exploration feel heavy and oppressive.

October Average Humidity in Sumas

This chart illustrates the average monthly humidity levels in Sumas, 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 Sumas is approximately 88%, 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 Sumas

In Sumas in October, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Sumas for better planning.

Maximum UV Index Levels in Sumas for October

The chart shows the monthly maximum UV Index (UVI) for Sumas 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 Sumas typically reaches 4, which falls under the moderate exposure category.

Data source: Sumas 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 Sumas Compares to Other Months

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

This table compares monthly weather conditions in Sumas, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (37°F)	240 mm (9.4 inches)	87%	low
February Weather	2°C (35°F)	214 mm (8.4 inches)	86%	moderate
March Weather	5°C (41°F)	197 mm (7.8 inches)	88%	moderate
April Weather	8°C (47°F)	162 mm (6.4 inches)	86%	high
May Weather	12°C (54°F)	103 mm (4.0 inches)	82%	high
June Weather	15°C (59°F)	82 mm (3.2 inches)	82%	very high
July Weather	17°C (63°F)	44 mm (1.8 inches)	85%	very high
August Weather	18°C (64°F)	27 mm (1.1 inches)	77%	very high
September Weather	14°C (58°F)	166 mm (6.5 inches)	76%	high
October Weather	9°C (48°F)	229 mm (9.0 inches)	88%	moderate
November Weather	5°C (42°F)	317 mm (12.5 inches)	88%	low
December Weather	2°C (36°F)	269 mm (10.6 inches)	89%	low