August Weather in Northwest, United States

Last updated: June 24, 2025

In Northwest, United States, the average temperature in August hovers around 26°C (80°F). Expect a minimum of 16°C (61°F) and a maximum reaching 35°C (95°F). During this month, you'll encounter about 205 mm (8.1 in) of precipitation spread over 22 days, resulting in an average humidity of 80%. Plan accordingly to make the most of this warm and wet season!

August Temperature in Northwest

In August in Northwest, the average temperature is 26°C (80°F). Maximums can reach 35°C (95°F) and minimums can be as low as 16°C (61°F). This pleasant climate makes Northwest an ideal destination for travelers seeking both warmth and comfort.

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

The chart illustrates August 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, August typically has an average temperature of 26°C (80°F), with highs reaching up to 35°C (95°F) and lows dropping to around 16°C (61°F).

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

August Precipitation in Northwest

In Northwest in August, the total precipitation amount is 205 mm (8.1 in) over the course of 22 days.

August Precipitation Trends in Northwest

The chart displays monthly precipitation patterns in Northwest, 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 Northwest, August typically receives around 205 mm (8.1 inches) of precipitation spread over approximately 22 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 Northwest

In Northwest in August humidity is 80%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket, making it quite uncomfortable for traveling. The thick, heavy air can leave you feeling sticky and fatigued, making outdoor activities more challenging and necessitating frequent breaks for hydration and cooling down.

August Average Humidity in Northwest

This chart illustrates the average monthly humidity levels in Northwest, 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 Northwest is approximately 80%, 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 Northwest

In Northwest in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Northwest.

Maximum UV Index Levels in Northwest for August

The chart shows the monthly maximum UV Index (UVI) for Northwest 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 Northwest typically reaches 10, which falls under the very high exposure category.

Data source: Northwest 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 Northwest Compares to Other Months

Weather in Northwest varies notably across the year, with each month offering distinct climate conditions. This page compares August’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 August’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