Portland Weather in July

July offers terrific summer weather for Portland, Oregon. This is the city's sunniest and least rainy time of the year.

This page gives detailed information on the typical July temperature, precipitation, sun, humidity, wind and storms for Portland. The numbers here are historical averages based on climate data gathered near the Portland International Airport, located a few miles from downtown Portland.

Temperature Weather iconTemperature

82 °F July average high 28 °C
57 °F July average low 14 °C

The days at Portland warm steadily during July, until they peak for the year from the 22nd to the 31st and on into August. These dates have daily highs averaging 83 degrees Fahrenheit (28 degrees Celsius) and lows of 58 °F (14 °C).

19 days 80 °F max. or more (27 °C)
26 days 60 °F min. or less (16 °C)

Nearly every day in July warms to over 70 °F (21 °C) in Portland. The city averages 6 days this month when the thermometer reaches into the 90s °F (over 32 °C). Temperatures of 100 °F (38 °C) occur every few years here during July.

At night, the thermometer dips just once on average to below 51 °F (11 °C) . But July does not normally get as cold as 40 °F (4 °C).

Rainy Weather iconRain

0.7 in total precipitation 17 mm
3 days of rain

Half the time, the city receives 0.2 to 1.0 inches (6 to 26 mm) of rainfall for the entire month. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

69 % sunshine
13 days clear skies

July is the sunniest month for Portland. The sun's rays reach the ground during 69 percent of daylight hours on average, for a total of 326 hours in the month. Typically on 13 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in July at Portland lasts for 15 hours and 15 minutes a day on average. The longest day of the month is the 1st with 15 hours and 37 minutes of daylight. By the end of the month, the days have shortened to 14:46 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

63 % July average humidity

July is the least humid month for Portland. The relative humidity in Portland during July usually peaks at 80 percent in the morning then drops to 44 percent by mid afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 74 80 76 61 49 44 52 66

Windy Weather iconWind

7.6 mph July wind speed average 12.2 kph

July is a little less windy than most other months in Portland.

Stormy Weather iconStorms

0 days rainfall of 0.5 inches (13 mm) or more
1 day with thunderstorms in July

Rainstorms are less common in July than other months at Portland. A storm that drops half an inch or more rain in a day occurs during this month only about once a decade. Portland normally never receives as much as an inch (25 mm) of rain at once this time of year. A thunderstorm happens in most, but not all, Julys.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

Portland Weather
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