July Weather in Portland, United States

Last updated: June 24, 2025

In July, the average temperature in Portland, United States reaches a pleasant 29°C (84°F). During this month, temperatures can dip as low as 22°C (72°F) and soar up to a sizzling 36°C (97°F). With an average humidity of 78%, the air feels quite tropical. Expect 101 mm (4.0 in) of precipitation spread over 11 days, so don’t forget your umbrella!

July Temperature in Portland

In July in Portland, the average temperature is 29°C (84°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 22°C (72°F). This makes it an ideal destination for those who enjoy warm weather and outdoor activities.

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

The chart illustrates July 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, July typically has an average temperature of 29°C (84°F), with highs reaching up to 36°C (97°F) and lows dropping to around 22°C (72°F).

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

July Precipitation in Portland

In Portland in July, the precipitation amount is 101 mm (4.0 in) spread over 11 days.

July Precipitation Trends in Portland

The chart displays monthly precipitation patterns in Portland, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Portland, July typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Portland

In Portland in July humidity is 78%. With an average temperature of 29°C (84°F), this humidity feels like a thick blanket enveloping you, making travel feel sticky and exhausting as you navigate through the heat.

July Average Humidity in Portland

This chart illustrates the average monthly humidity levels in Portland, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Portland is approximately 78%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Portland

In Portland in July, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Portland.

Maximum UV Index Levels in Portland for July

The chart shows the monthly maximum UV Index (UVI) for Portland in July, 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 July, the maximum UV index in Portland typically reaches 12, which falls under the extreme exposure category.

Data source: Portland July 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 July 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 July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (58°F)	39 mm (1.5 inches)	78%	moderate
February Weather	16°C (60°F)	31 mm (1.2 inches)	82%	very high
March Weather	20°C (68°F)	52 mm (2.1 inches)	79%	very high
April Weather	23°C (73°F)	44 mm (1.7 inches)	82%	extreme
May Weather	26°C (79°F)	138 mm (5.4 inches)	81%	extreme
June Weather	28°C (83°F)	136 mm (5.4 inches)	77%	extreme
July Weather	29°C (84°F)	101 mm (4.0 inches)	78%	extreme
August Weather	29°C (85°F)	81 mm (3.2 inches)	78%	extreme
September Weather	28°C (82°F)	141 mm (5.6 inches)	79%	extreme
October Weather	24°C (75°F)	77 mm (3.0 inches)	77%	very high
November Weather	19°C (66°F)	51 mm (2.0 inches)	78%	high
December Weather	16°C (61°F)	47 mm (1.9 inches)	80%	moderate