August Weather in Umatilla, United States

Last updated: June 24, 2025

The average temperature in Umatilla, United States during August is a warm 26°C (79°F). Temperatures can fluctuate, with a minimum of 9°C (49°F) and a scorching maximum of 43°C (109°F). Expect a light precipitation of only 4 mm (0.1 in) spread over 0 days, while the average humidity hovers around 60%, creating a pleasant atmosphere.

August Temperature in Umatilla

In August in Umatilla, the average temperature is 26°C (79°F). Maximum temperatures can reach up to 43°C (109°F), while minimums can drop as low as 9°C (49°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates August 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, August typically has an average temperature of 26°C (79°F), with highs reaching up to 43°C (109°F) and lows dropping to around 9°C (49°F).

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

August Precipitation in Umatilla

In Umatilla in August, the precipitation amount is 4 mm (0.1 in) recorded over a span of 0 days.

August Precipitation Trends in Umatilla

The chart displays monthly precipitation patterns in Umatilla, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Umatilla, August typically receives around 4 mm (0.1 inches) of precipitation spread over approximately 0 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Umatilla

In Umatilla in August humidity is 60%. With an average temperature of 26°C (79°F), this humidity feels like walking through a warm, damp blanket, making any outdoor activities a bit more exhausting but still enjoyable as you soak in the vibrant atmosphere.

August Average Humidity in Umatilla

This chart illustrates the average monthly humidity levels in Umatilla, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Umatilla is approximately 60%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Umatilla

In Umatilla in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Umatilla.

Maximum UV Index Levels in Umatilla for August

The chart shows the monthly maximum UV Index (UVI) for Umatilla in August, 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 August, the maximum UV index in Umatilla typically reaches 9, which falls under the very high exposure category.

Data source: Umatilla August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	35 mm (1.4 inches)	86%	low
February Weather	3°C (37°F)	46 mm (1.8 inches)	86%	moderate
March Weather	8°C (46°F)	30 mm (1.2 inches)	85%	moderate
April Weather	13°C (55°F)	24 mm (0.9 inches)	83%	high
May Weather	18°C (65°F)	15 mm (0.6 inches)	77%	very high
June Weather	23°C (73°F)	8 mm (0.3 inches)	81%	very high
July Weather	27°C (81°F)	0 mm (0.0 inches)	76%	very high
August Weather	26°C (79°F)	4 mm (0.1 inches)	60%	very high
September Weather	20°C (69°F)	9 mm (0.4 inches)	58%	high
October Weather	12°C (54°F)	26 mm (1.0 inches)	75%	moderate
November Weather	6°C (43°F)	34 mm (1.3 inches)	85%	moderate
December Weather	2°C (37°F)	33 mm (1.3 inches)	87%	low