August Weather in Umatilla, United States

Last updated: June 24, 2025

In August, the average temperature in Umatilla, United States hovers around a warm 28°C (82°F). Expect minimums of 22°C (73°F) and maximums reaching 35°C (96°F), making it a toasty time of year. During this month, you can also anticipate 203 mm (8.0 in) of precipitation over 26 days, contributing to an average humidity level of 81%.

August Temperature in Umatilla

In August in Umatilla, the average temperature is 28°C (82°F). The maximum can reach 35°C (96°F), while the minimum can drop to 22°C (73°F). It's a great time to visit for those who enjoy warm weather and outdoor activities.

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 28°C (82°F), with highs reaching up to 35°C (96°F) and lows dropping to around 22°C (73°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 203 mm (8.0 in), falling over 26 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 203 mm (8.0 inches) of precipitation spread over approximately 26 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 81%. With an average temperature of 28°C (82°F), this humidity feels like a warm blanket wrapped around you, making traveling somewhat uncomfortable as the air thickens, leaving you longing for a refreshing breeze.

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 81%, 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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme 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	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