January Weather in Northwest, United States

Last updated: June 24, 2025

In January, the average temperature in Northwest, United States hovers around 9°C (48°F). This month can bring a chill, with minimum temperatures dipping to -10°C (14°F), while the mercury might rise as high as 26°C (79°F) on warmer days. Expect some moisture too, with 70 mm (2.8 in) of precipitation spread over 9 days, and an average humidity level of 85%. 🥶☔

January Temperature in Northwest

In January in Northwest, the average temperature is 9°C (48°F). Maximums can reach 26°C (79°F), while minimums can drop as low as -10°C (14°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates January 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, January typically has an average temperature of 9°C (48°F), with highs reaching up to 26°C (79°F) and lows dropping to around -10°C (14°F).

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

January Precipitation in Northwest

In Northwest in January, the total precipitation amount is 70 mm (2.8 in) spread over 9 days.

January Precipitation Trends in Northwest

The chart displays monthly precipitation patterns in Northwest, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Northwest, January typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Northwest

In Northwest in January humidity is 85%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay warm and comfortable while traveling.

January Average Humidity in Northwest

This chart illustrates the average monthly humidity levels in Northwest, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Northwest is approximately 85%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Northwest

In Northwest in January, 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 Northwest for better planning.

Maximum UV Index Levels in Northwest for January

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

Data source: Northwest January 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 January 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 January’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 January’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