January Weather in Mattawa, United States

Last updated: June 24, 2025

In January, the average temperature in Mattawa, United States hovers around -1°C (31°F), creating a chilly atmosphere. Expect minimum lows plummeting to -23°C (-9°F) and highs reaching a mild 13°C (56°F). While you brace for the cold, be prepared for 45 mm (1.8 in) of precipitation over 10 days, alongside an average humidity of 86%. Make sure to dress warmly!

January Temperature in Mattawa

In January in Mattawa, the average temperature is -1°C (31°F), with maximums reaching 13°C (56°F) and minimums plummeting to -23°C (-9°F). Be prepared for a wide range of temperatures if you're planning to travel during this month.

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

The chart illustrates January temperature patterns in Mattawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mattawa, January typically has an average temperature of -1°C (31°F), with highs reaching up to 13°C (56°F) and lows dropping to around -23°C (-9°F).

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

January Precipitation in Mattawa

In Mattawa in January, the precipitation amount is 45 mm (1.8 in) spread over a duration of 10 days.

January Precipitation Trends in Mattawa

The chart displays monthly precipitation patterns in Mattawa, 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 Mattawa, January typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 10 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 Mattawa

In Mattawa in January humidity is 86%. With an average temperature of -1°C (31°F), this humidity feels like an eerie chill enveloping you, making travel uncomfortable as the damp air bites into your skin and the cold seeps through even the warmest of clothes, creating an atmosphere that is heavy and uninviting.

January Average Humidity in Mattawa

This chart illustrates the average monthly humidity levels in Mattawa, 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 Mattawa is approximately 86%, 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 Mattawa

In Mattawa in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Mattawa, you can visit Hourly UV Index in Mattawa.

Maximum UV Index Levels in Mattawa for January

The chart shows the monthly maximum UV Index (UVI) for Mattawa 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 Mattawa typically reaches 2, which falls under the low exposure category.

Data source: Mattawa 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 Mattawa Compares to Other Months

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

This table compares monthly weather conditions in Mattawa, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	45 mm (1.8 inches)	86%	low
February Weather	0°C (33°F)	43 mm (1.7 inches)	86%	moderate
March Weather	6°C (43°F)	27 mm (1.1 inches)	87%	moderate
April Weather	11°C (52°F)	26 mm (1.0 inches)	84%	high
May Weather	17°C (63°F)	17 mm (0.7 inches)	81%	very high
June Weather	21°C (70°F)	7 mm (0.3 inches)	82%	very high
July Weather	25°C (77°F)	1 mm (0.0 inches)	79%	very high
August Weather	25°C (77°F)	5 mm (0.2 inches)	63%	very high
September Weather	19°C (66°F)	14 mm (0.5 inches)	62%	high
October Weather	11°C (51°F)	33 mm (1.3 inches)	83%	moderate
November Weather	4°C (40°F)	35 mm (1.4 inches)	89%	moderate
December Weather	0°C (33°F)	38 mm (1.5 inches)	88%	low