August Weather in Portland, Australia

Last updated: August 22, 2025

In August, the average temperature in Portland, Australia is a cool 6°C (44°F). Expect a minimum chill of -4°C (25°F) and a pleasant maximum of 20°C (68°F). During this time, 46 mm (1.8 in) of precipitation typically falls over 7 days, complemented by an average humidity level of 74%.

August Temperature in Portland

In August in Portland, the average temperature is 6°C (44°F). Maximum temperatures can reach 20°C (68°F), while the minimum can drop as low as -4°C (25°F). This variation makes it essential for travelers to pack layers for both warmth and comfort during their visit.

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

The chart illustrates August temperature patterns in Portland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portland, August typically has an average temperature of 6°C (44°F), with highs reaching up to 20°C (68°F) and lows dropping to around -4°C (25°F).

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

August Precipitation in Portland

In Portland in August, the precipitation amount is 46 mm (1.8 in) over the course of 7 days.

August Precipitation Trends in Portland

The chart displays monthly precipitation patterns in Portland, 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 Portland, August typically receives around 46 mm (1.8 inches) of precipitation spread over approximately 7 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 Portland

In Portland in August, humidity is 74%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable and may require travelers to dress in layers to stay warm and dry.

August Average Humidity in Portland

This chart illustrates the average monthly humidity levels in Portland, 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 Portland is approximately 74%, 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 Portland

In Portland in August, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Portland, you can refer to this Hourly UV Index in Portland.

Maximum UV Index Levels in Portland for August

The chart shows the monthly maximum UV Index (UVI) for Portland 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 Portland typically reaches 6, which falls under the high exposure category.

Data source: Portland 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 Portland Compares to Other Months

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

This table compares monthly weather conditions in Portland, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (70°F)	44 mm (1.7 inches)	55%	extreme
February Weather	19°C (66°F)	72 mm (2.8 inches)	60%	extreme
March Weather	17°C (63°F)	113 mm (4.4 inches)	68%	extreme
April Weather	13°C (56°F)	23 mm (0.9 inches)	74%	very high
May Weather	9°C (49°F)	26 mm (1.0 inches)	78%	high
June Weather	7°C (44°F)	28 mm (1.1 inches)	78%	moderate
July Weather	6°C (43°F)	33 mm (1.3 inches)	79%	moderate
August Weather	6°C (44°F)	46 mm (1.8 inches)	74%	high
September Weather	10°C (50°F)	35 mm (1.4 inches)	69%	very high
October Weather	14°C (57°F)	57 mm (2.3 inches)	57%	extreme
November Weather	16°C (61°F)	88 mm (3.5 inches)	53%	extreme
December Weather	19°C (66°F)	76 mm (3.0 inches)	62%	extreme