July Weather in Portland, United States

Last updated: February 24, 2025

In July, Portland experiences a delightful summer climate, with average temperatures around 20°C (68°F) and a peak of 28°C (83°F), perfect for outdoor activities and exploration. Despite the warmth, residents should be prepared for occasional rainfall, as the city receives about 123 mm (4.9 in) of precipitation across 12 days this month. With humidity levels averaging 67%, the evenings can offer a refreshing reprieve, showcasing why July is a cherished time in the Rose City, blending sunshine with the lush greenery that defines its landscape.

July Temperature in Portland

In Portland, July heralds the peak of summer, bringing a delightful warmth that sets it apart from the chillier months. With minimum temperatures averaging around 13°C (56°F) and daily highs reaching a pleasant 28°C (83°F), residents and visitors alike can enjoy the outdoors in comfort. The average temperature of 20°C (68°F) invites picnics in the park and strolls along the waterfront, while the warm evenings encourage outdoor gatherings under the stars. This month stands in stark contrast to the winter chill experienced earlier in the year, showcasing a clear seasonal transition and marking July as a vibrant highlight in Portland's annual climate tapestry.

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.
JanFebMarAprMayJunJulAugSepOctNovDec282934435262686963544232
Data source: Temperature data for Portland generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

July Precipitation in Portland

In July, Portland experiences an increase in precipitation, recording 123 mm (4.9 in) over 12 days. This surge marks a notable uptick compared to the drier June, which only saw 80 mm (3.2 in) across 9 days. Interestingly, while July's rainfall is significant, it is balanced by the fact that this month is also among the warmest of the year, indicating a unique blend of summer warmth and intermittent rain. Following July, August typically returns to a drier spell, showcasing a seasonal transition. Overall, this pattern emphasizes Portland’s characteristic weather fluctuations, where peak rainfall often complements the idyllic summer months.

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.
JanFebMarAprMayJunJulAugSepOctNovDec971039114994801237577163130144
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

July Humidity in Portland

In July, Portland experiences a notable dip in humidity, averaging around 67%, which is a refreshing change from the higher levels seen in the first half of the year. This decrease continues the trend established in May and June, where humidity levels remained steady at 72%. As summer progresses into August, humidity slightly lowers even further to 66%, marking the annual low point. This decrease in humidity not only contributes to the city’s pleasant summer weather but also enhances outdoor activities, allowing residents and visitors alike to enjoy the vibrant scenery without the oppressive stickiness often associated with high humidity months like January and February, which see levels above 80%. Overall, July's humidity trends highlight Portland’s seasonal transition towards drier, more enjoyable summer days.

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, allowing you to see how July's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Portland

In July in Portland, the UV Index remains at a striking 9, classified as very high, indicating that sun exposure poses a significant risk. With a burn time of just 15 minutes, it's essential for residents and visitors to take protective measures as the summer sun can be intense. This month mirrors June's elevated levels, though it is slightly lower than May's peak of 9. The steady high ratings from April through August underscore a trend of increased UV radiation, reminding us that skin protection is crucial during these sun-soaked months. For detailed insights and to stay updated on the UV Index, visit Portland UV Index.

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.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
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.

July Sunshine in Portland

In July, Portland basks in the brilliance of 333 hours of sunshine, marking the peak of the city's sunny season. This vibrant month follows a gradual incline from 148 hours in January to an impressive 294 hours in May, highlighting a remarkable transformation as the days grow longer. With a slight rise to 336 hours in August, the warmth continues to embrace the city, allowing residents and visitors to fully enjoy the outdoors. The trend of increasing sunlight from the start of the year reflects not just a welcome surge in brightness, but also an invitation to experience Portland's lush landscapes and lively summer activities, making July a quintessential month for sun-seekers.

Monthly Sunshine Duration in Portland: July Highlighted

The July sunshine duration represents the total number of hours Portland experiences direct sunlight during the month of July, excluding cloudy or obstructed periods. This chart compares the sunshine duration of July with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec148h182h256h244h294h329h333h336h288h216h190h174h
Data source: Portland July Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Portland During July

Despite the summer season's reputation for sunshine, July in Portland offers a surprisingly low chance of sunny weather, with only a 29% likelihood. This trend stands out against the backdrop of more favorable months like March, which boasts a 61% chance of sun, and September, where the potential rises to 43%. Interestingly, while winter months like January and February hover in the high 30s, they still surpass July’s sun probability. The sunniest months in Portland tend to cluster in spring and early fall, suggesting that even in the heart of summer, Portlanders should prepare for a mix of weather rather than an unending stretch of sunny days.

Percentage of Sunny Days in July in Portland

The chart illustrates the percentage of sunny days in Portland throughout the year, with July highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Portland experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%34%61%36%37%40%29%33%43%37%54%33%
Data source: Portland July chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Portland in July

In July, Portland basks in 15 hours of daylight, maintaining the peak brightness established in June. This vibrant month marks the pinnacle of summer, where the sun lingers longer in the sky, inviting outdoor activities and celebrations. Following July, daylight begins its gradual decline, dipping to 13 hours in August, indicative of the shifting seasons. As the year progresses, the sunlight wanes steadily, with shorter days ushering in the fall. This rhythmic pattern of daylight emphasizes Portland’s dynamic seasonal changes, providing residents and visitors alike with the opportunity to savor the sun-soaked joys of summer while anticipating the cozy, dimming days ahead.

Average Daylight Hours in Portland for July

The chart illustrates the variation in daylight duration in Portland throughout the year, with July highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 20m10h 30m11h 58m13h 27m14h 43m15h 22m15h 1m13h 53m12h 26m10h 57m9h 38m8h 58m
Data source: Portland daylight hours, calculated by summing the hours between sunrise and sunset for each day.

July Winds in Portland

In July, Portland experiences a noticeable dip in wind speed, averaging just 3.4 m/s (8 mph), making it one of the calmer months of the year. This gentle breeze is a stark contrast to the brisker winds of earlier months, such as March with its peak of 5.3 m/s (12 mph). As summer settles in, the winds further soften into August, dropping slightly to 3.3 m/s (7 mph). This trend of decreasing wind speeds through the peak of summer hints at the more tranquil and warmer weather, ideal for outdoor activities and enjoying the vibrant Portland scene. However, as autumn approaches, wind speeds begin to pick up again, hinting at the seasonal shift ahead.

Average July Wind Speed in Portland

The chart displays monthly wind speed patterns in Portland, with values for each month shown alongside July's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how July's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.84.75.34.64.04.43.4 m/s3.34.04.24.54.8
Data source: Portland July wind data, generated using information from the Copernicus Climate Change Service.

How July Weather in Portland Compares to Other Months

The weather in Portland changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of July's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Portland and find detailed weather information for every month.

When comparing the weather in July and January, the differences are stark and striking. July boasts milder temperatures, with an average of 20°C (68°F) and maximums reaching up to 28°C (83°F), while January experiences a much colder climate, averaging -2°C (28°F) and dipping as low as -19°C (-2°F). Precipitation levels are also noteworthy; July sees about 123 mm (4.9 in) over 12 days, while January has slightly less precipitation at 97 mm (3.8 in) across 9 days. Interestingly, January's higher humidity at 86% contrasts with July's average of 67%, contributing to the overall chill felt in the winter months. For more information on Portland's winter weather, you can check out Portland weather in January.

In July, Portland experiences a mild climate with average temperatures around 20°C (68°F), peaking at a maximum of 28°C (83°F) on warmer days, while enjoying relatively low precipitation of 123 mm (4.9 in) over 12 days. In contrast, February brings much colder weather, with average temperatures dropping to -2°C (29°F) and reaching a maximum of just 14°C (57°F). Despite slightly lower precipitation levels at 103 mm (4.1 in) over 10 days, February also has higher humidity at 84%, making the cold feel even more intense. For a detailed look at February's climate, you can visit Portland weather in February.

When comparing the weather in July and March, the differences are quite striking. July boasts a mild to warm climate with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 28°C (83°F), maintaining an average of 20°C (68°F). In contrast, March experiences a much colder environment, with temperatures spanning from a frigid -15°C (6°F) to a maximum of 13°C (56°F) and averaging just 1°C (34°F). Precipitation in July is relatively high at 123 mm (4.9 in) over 12 days, while March sees slightly less rainfall at 91 mm (3.6 in) across 9 days. Humidity levels also differ, with July at 67% and March higher at 82%. For more detailed information, you can check Portland weather in March.

In comparing the weather of April and July, it is evident that July is significantly warmer, with average temperatures ranging from a minimum of 13°C (56°F) to a maximum of 28°C (83°F). In contrast, April experiences cooler temperatures, with averages between -3°C (27°F) and 18°C (65°F). While both months see a fair amount of precipitation, April has slightly higher rainfall at 149 mm (5.9 in) over 13 days, compared to July's 123 mm (4.9 in) over 12 days. Additionally, April's humidity is higher at 80%, whereas July's humidity averages around 67%. For more detailed information on April's weather patterns, you can check Portland weather in April.

In comparison, the weather in July is significantly warmer than in May, with average temperatures reaching 20°C (68°F) compared to May's 11°C (52°F). July experiences a broader temperature range, from a minimum of 13°C (56°F) to a maximum of 28°C (83°F), while May shows a more modest range with a minimum of 2°C (36°F) and a maximum of 24°C (76°F). Although July has higher precipitation at 123 mm (4.9 in) over 12 days, May's precipitation of 94 mm (3.7 in) occurs over slightly fewer days, indicating that both months can experience wet weather. Notably, humidity levels are slightly lower in July at 67%, compared to 72% in May. For more detailed insights, check out Portland weather in May.

In comparing the weather of July and June, July tends to be warmer with an average temperature of 20°C (68°F), contrasting with June's lower average of 17°C (62°F). Both months share the same maximum temperature of 28°C (83°F), yet July experiences a higher minimum temperature of 13°C (56°F) compared to June's 8°C (47°F). In terms of precipitation, July sees increased rain, totaling 123 mm (4.9 in) over 12 days, while June has less with 80 mm (3.2 in) over 9 days. Humidity levels are slightly lower in July at 67% versus June's 72%, making July feel a bit less muggy despite the increased rainfall. For more details on June weather, you can visit Portland weather in June.

In comparing the weather between July and August, both months experience similar average high temperatures of around 28°C (83°F), but July tends to be slightly warmer overall with an average temperature of 20°C (68°F) compared to 20°C (69°F) in August. Precipitation is notably higher in July, with 123 mm (4.9 inches) over 12 days, while August sees a significant reduction, with only 75 mm (3.0 inches) over 9 days. Additionally, humidity levels are quite comparable, with July at 67% and August at 66%. For a more detailed look at what to expect, you can visit Portland weather in August.

In comparing July and September weather, July boasts warmer temperatures with an average of 20°C (68°F), peaking at 28°C (83°F), while September's average drops to 17°C (63°F), maxing out at 26°C (79°F). July also experiences more rainfall, with 123 mm (4.9 in) over 12 days, compared to September's 77 mm (3.0 in) over just 8 days. Additionally, humidity levels are slightly higher in September at 71%, compared to July's 67%. For more detailed information, check out Portland weather in September.

In July, the weather is generally warm and pleasant, with average temperatures around 20°C (68°F) and maximums reaching 28°C (83°F). However, the month also sees a fair amount of rainfall, with 123 mm (4.9 in) spread over 12 days and a humidity level of 67%. In contrast, October brings cooler temperatures, with averages dropping to 12°C (54°F) and minimums falling as low as 1°C (34°F). This month experiences slightly higher precipitation at 163 mm (6.4 in) over 13 days and increased humidity levels at 78%. To get more detailed insights about the weather specifically in Portland during October, you can visit Portland weather in October.

In July, the weather is characterized by mild temperatures ranging from a minimum of 13°C (56°F) to a maximum of 28°C (83°F), with an average of 20°C (68°F). However, it is a relatively wet month, receiving 123 mm (4.9 in) of precipitation over 12 days, accompanied by a moderate humidity level of 67%. In stark contrast, November sees much cooler temperatures, with a minimum of -12°C (11°F) and an average of only 5°C (42°F), peaking at 18°C (64°F). Despite experiencing a similar number of rainy days, November's precipitation slightly increases to 130 mm (5.1 in) and the humidity rises to 84%. For more detailed insights, you can refer to Portland weather in November.

When comparing the weather in July and December, the contrast is striking. July typically showcases mild temperatures, with averages around 20°C (68°F) and maximums reaching 28°C (83°F), while experiencing relatively high humidity at 67%. In contrast, December presents a dramatically colder climate, where temperatures drop to an average of 0°C (33°F) and can plummet to as low as -18°C (-1°F). The month sees slightly more precipitation at 144 mm (5.7 in), though it occurs over fewer days (10) compared to July's 12 days of rain. The humidity also increases in December to 81%, contributing to a chillier atmosphere overall. For more detailed information about Portland's weather in December, you can refer to Portland weather in December.

Compare Portland's Climate with Cities Worldwide

Conclusion: What to Expect From July Weather in Portland

In July, Portland experiences a delightful shift in weather, making it one of the warmest months of the year. With average temperatures hovering around 20°C (68°F), residents and visitors alike enjoy warmer days that invite outdoor activities. However, unlike the dry summer climates found elsewhere, Portland's humidity tends to linger, often leading to occasional rain that can surprise unsuspecting sunbathers. With around 12 days of precipitation, July is notable for a mix of sunshine and rain, creating a vibrant and lush landscape. This unique combination of warmth and moisture sets July apart from other months, offering a distinct experience for those exploring the beauty of the region. For a deeper understanding of the city's weather patterns throughout the year, check out Portland Climate.