January Weather in Umatilla, United States

Last updated: June 24, 2025

In Umatilla, United States, the average temperature in January hovers around 15°C (59°F). However, be prepared for a range, as temperatures can dip to a chilly -4°C (26°F) or rise to a warm 29°C (85°F). Expect 47 mm (1.9 in) of precipitation spread over 4 days, and brace yourself for high humidity levels at 83%.

January Temperature in Umatilla

In January, in Umatilla, the average temperature is 15°C (59°F), with the maximum reaching 29°C (85°F) and the minimum dropping to as low as -4°C (26°F). This variation makes it essential to pack both light clothing and warmer layers when traveling during this time.

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

The chart illustrates January temperature patterns in Umatilla, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Umatilla, January typically has an average temperature of 15°C (59°F), with highs reaching up to 29°C (85°F) and lows dropping to around -4°C (26°F).

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

January Precipitation in Umatilla

In Umatilla in January, the precipitation amount is 47 mm (1.9 in) over the course of 4 days.

January Precipitation Trends in Umatilla

The chart displays monthly precipitation patterns in Umatilla, 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 Umatilla, January typically receives around 47 mm (1.9 inches) of precipitation spread over approximately 4 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 Umatilla

In Umatilla in January humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.

January Average Humidity in Umatilla

This chart illustrates the average monthly humidity levels in Umatilla, 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 Umatilla is approximately 83%, 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 Umatilla

In Umatilla in January, 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 Umatilla.

Maximum UV Index Levels in Umatilla for January

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

Data source: Umatilla 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 Umatilla Compares to Other Months

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

This table compares monthly weather conditions in Umatilla, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	15°C (59°F)	47 mm (1.9 inches)	83%	moderate
February Weather	18°C (65°F)	57 mm (2.2 inches)	80%	very high
March Weather	19°C (67°F)	25 mm (1.0 inches)	75%	very high
April Weather	22°C (72°F)	80 mm (3.2 inches)	70%	extreme
May Weather	25°C (77°F)	97 mm (3.8 inches)	68%	extreme
June Weather	27°C (81°F)	190 mm (7.5 inches)	75%	extreme
July Weather	27°C (82°F)	221 mm (8.7 inches)	79%	extreme
August Weather	28°C (82°F)	203 mm (8.0 inches)	81%	extreme
September Weather	27°C (81°F)	153 mm (6.0 inches)	83%	extreme
October Weather	25°C (77°F)	80 mm (3.1 inches)	81%	very high
November Weather	19°C (67°F)	58 mm (2.3 inches)	82%	high
December Weather	17°C (62°F)	71 mm (2.8 inches)	84%	moderate