October Weather in Northwest, United States

Last updated: June 24, 2025

In October, the average temperature in Northwest, United States hovers around 20°C (69°F). Expect a range from a cool 4°C (39°F) to a warm 35°C (94°F). During this time, precipitation is likely, with an average of 64 mm (2.5 in) spread over 9 days, contributing to an average humidity of 80%.

October Temperature in Northwest

In October in Northwest, the average temperature is 20°C (69°F). Maximum temperatures can reach 35°C (94°F), while the minimum can drop as low as 4°C (39°F). This diverse climate makes Northwest an ideal destination for travelers seeking a range of experiences, from warm afternoons to cool evenings.

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

The chart illustrates October temperature patterns in Northwest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Northwest, October typically has an average temperature of 20°C (69°F), with highs reaching up to 35°C (94°F) and lows dropping to around 4°C (39°F).

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

October Precipitation in Northwest

In Northwest in October, the precipitation amount is 64 mm (2.5 in) over a span of 9 days.

October Precipitation Trends in Northwest

The chart displays monthly precipitation patterns in Northwest, 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 Northwest, October typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Northwest

In Northwest in October, humidity is 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.

October Average Humidity in Northwest

This chart illustrates the average monthly humidity levels in Northwest, 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 Northwest is approximately 80%, 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 Northwest

In Northwest in October, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Northwest.

Maximum UV Index Levels in Northwest for October

The chart shows the monthly maximum UV Index (UVI) for Northwest 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 Northwest typically reaches 8, which falls under the very high exposure category.

Data source: Northwest 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 Northwest Compares to Other Months

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

This table compares monthly weather conditions in Northwest, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	70 mm (2.8 inches)	85%	moderate
February Weather	12°C (53°F)	93 mm (3.7 inches)	82%	high
March Weather	13°C (56°F)	70 mm (2.8 inches)	81%	very high
April Weather	18°C (64°F)	94 mm (3.7 inches)	80%	very high
May Weather	22°C (72°F)	120 mm (4.7 inches)	81%	extreme
June Weather	25°C (77°F)	160 mm (6.3 inches)	81%	extreme
July Weather	27°C (80°F)	171 mm (6.7 inches)	81%	extreme
August Weather	26°C (80°F)	205 mm (8.1 inches)	80%	very high
September Weather	24°C (76°F)	193 mm (7.6 inches)	79%	very high
October Weather	20°C (69°F)	64 mm (2.5 inches)	80%	very high
November Weather	13°C (55°F)	110 mm (4.3 inches)	85%	high
December Weather	10°C (51°F)	124 mm (4.9 inches)	86%	moderate