July Weather in Portland, United States

Last updated: February 24, 2025

July in Portland, United States brings a delightful mix of warmth and occasional rainfall, making it an ideal month for outdoor activities. With a maximum temperature reaching 37°C (99°F), the days can be quite warm, while evenings cool down to an average of 21°C (69°F) and sometimes dip to a refreshing 9°C (49°F). Rain is scarce, with only 6 mm (0.2 in) of precipitation over a single day, and humidity levels hover around 82%, adding a touch of muggy warmth to the air. Whether you’re exploring local parks or enjoying the vibrant city life, July offers a taste of summer that is both enjoyable and invigorating.

July Temperature in Portland

In July, Portland experiences a delightful peak in temperatures, offering a refreshing summer escape. With minimums settling around 9°C (49°F) and averages climbing to a comfortable 21°C (69°F), residents and visitors alike bask in the warmth. The warmest moments can reach up to 37°C (99°F), making it the hottest month of the year. This vibrant warmth not only welcomes outdoor activities but also contrasts sharply with the chilly depths of winter, showcasing a remarkable transition from the frigid January lows of -14°C (7°F). As the city enjoys its sunniest days, the gradual rise from the milder temperatures of spring unfolds an inviting landscape for summer adventures.

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.
JanFebMarAprMayJunJulAugSepOctNovDec424146515864697064534641
Data source: Temperature data for Portland generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

July Precipitation in Portland

In July, Portland experiences a remarkable shift in weather patterns, characterized by a dramatic drop in precipitation, with only 6 mm (0.2 in) recorded over just a single day. This stark contrast to the heavier rains of earlier months highlights the dry summer season that the city is known for. As spring transitions into summer, the frequency of rain also diminishes, resulting in merely eight days of precipitation from May to July, an ideal time for outdoor activities and events. This trend of reduced rainfall continues into August, though slightly more moisture is recorded. Overall, July showcases Portland's sun-drenched allure, providing residents and visitors alike a respite from the wet winters that precede it.

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.
JanFebMarAprMayJunJulAugSepOctNovDec16317213511758466862105155184
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Portland

In July, Portland experiences a notable dip in humidity, averaging around 82%, marking a slight decrease from the consistent 83% seen in the preceding months. This trend reflects the gradual drying out of the atmosphere as summer takes hold, providing residents with more comfortable conditions compared to the high humidity of winter months, which hover around 85% to 87%. As July leads into August, the decrease in humidity continues, dropping to 74%, suggesting that the warm summer air can feel less oppressive, making it an appealing time for outdoor activities and exploration. Overall, the shift in July sets the stage for the dry, pleasant days of late summer in this vibrant Pacific Northwest city.

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.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Portland

In July, Portland experiences its peak UV index, maintaining a very high rating of 10, similar to June. With such intense solar radiation, the recommended burn time drops to just 15 minutes, urging residents and visitors to take precautionary measures against sun exposure. This trend of increasing UV levels becomes apparent as spring transitions into summer, with values progressively climbing from a low of 2 in January to the scorching heights of July. As August approaches, the UV index slightly decreases to 8, yet it remains in the very high category. With these variations, it's crucial for individuals to stay informed and protect their skin throughout the year. For more detailed information, 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.
JanFebMarAprMayJunJulAugSepOctNovDec23569101087532
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 a splendid 374 hours of sunshine, marking the peak of summer's warmth and vitality. This month stands out distinctly from the year’s earlier months, showcasing a substantial increase from June's 318 hours. The pattern is clear: as winter's chill gives way to spring and then summer, sunshine hours consistently rise, culminating in July's bright embrace. Following July, sunshine begins to taper off in August with 335 hours, hinting at the transitional phase toward autumn. The trend of gradually increasing sunlight not only enhances the city's vibrant outdoor culture but also perfectly sets the stage for summer festivities, making July an ideal time for both residents and visitors to revel in Portland's natural beauty.

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.
JanFebMarAprMayJunJulAugSepOctNovDec88h123h195h229h282h318h374h335h268h211h136h115h
Data source: Portland July Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Portland During July

July is a standout month for sunshine in Portland, boasting a robust 74% chance of clear skies. This peak in sunny weather is the culmination of a steady upward trend that begins in the earlier months. While January and February offer only a meager 16% and 17% chance of sunshine, this gradually climbs through the spring, reaching 54% in April and continuing to rise into the summer. By the time June rolls around, residents can expect about 63% sunny days, setting the stage for July's sun-drenched glory. Even as August approaches, the likelihood of sunny weather drops to 57%, but July remains the highlight, offering ample opportunity for outdoor activities and sunshine-filled adventures.

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.
JanFebMarAprMayJunJulAugSepOctNovDec16%17%38%54%37%63%75%58%50%30%16%14%
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 9m10h 24m11h 57m13h 33m14h 55m15h 35m15h 13m13h 59m12h 27m10h 52m9h 28m8h 45m
Data source: Portland daylight hours, calculated by summing the hours between sunrise and sunset for each day.

July Winds in Portland

In July, the winds in Portland gently carry summer warmth, maintaining an average speed of 2.4 m/s (5 mph)—consistent with the breezy conditions observed throughout the preceding months. This steady airflow mirrors June's calmness, creating a serene atmosphere ideal for enjoying the lush, green parks and vibrant outdoor activities that the city is known for. As summer progresses into August, a slight dip in wind speed to 2.2 m/s (5 mph) is anticipated, suggesting a continuation of these mild, pleasant summer days. Portland's wind patterns show minimal fluctuation during the summer, which pairs beautifully with the region's idyllic landscapes, allowing for a harmonious blend of natural beauty and outdoor engagement.

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.
JanFebMarAprMayJunJulAugSepOctNovDec2.42.92.22.22.42.22.4 m/s2.22.32.72.82.7
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.

July and January present strikingly contrasting weather conditions. In July, temperatures can soar, ranging from a mild 9°C (49°F) to a scorching 37°C (99°F), with an average of 21°C (69°F). The month is generally dry, receiving only 6 mm (0.2 in) of precipitation over just one day, though humidity remains high at 82%. In stark contrast, January experiences much colder temperatures, with minimums dropping to -14°C (7°F) and an average of only 5°C (42°F). Precipitation is significantly higher during this month, totaling 163 mm (6.4 in) spread across 17 days, contributing to a humidity level of 85%. For more details on January weather, you can check Portland weather in January.

July and February present stark contrasts in weather conditions. In July, temperatures can soar, with averages around 21°C (69°F) and a maximum reaching up to 37°C (99°F), accompanied by minimal precipitation of just 6 mm (0.2 in) over one day. The humidity hovers around 82%, adding a slight stickiness to the warm summer days. In contrast, February brings much cooler temperatures, with an average of 5°C (41°F) and a maximum of only 17°C (63°F). This month is often characterized by heavy rainfall, with a total precipitation of 172 mm (6.8 in) falling over 19 days, and humidity remains similar at 84%. For more details, check Portland weather in February.

In comparing the weather between July and March, we notice a stark contrast in temperatures and precipitation levels. July boasts a warm temperature range with a minimum of 9°C (49°F) and a maximum of 37°C (99°F), while March experiences much cooler conditions, with a minimum of -4°C (26°F) and a maximum of 24°C (75°F). Additionally, July is quite dry, receiving only 6 mm (0.2 in) of precipitation over just 1 day, whereas March is significantly wetter, with 135 mm (5.3 in) of rain occurring over 17 days. Humidity levels are also slightly higher in March at 85% compared to July's 82%. For a more detailed look at what to expect, you can check out Portland weather in March.

In comparing the weather of July and April, the differences are quite striking. July experiences warmer temperatures, with a minimum of 9°C (49°F) and an average of 21°C (69°F), peaking at a scorching 37°C (99°F). In contrast, April starts off cooler, with temperatures ranging from a minimum of -1°C (31°F) to a maximum of 29°C (84°F) and an average of 11°C (51°F).

Additionally, July boasts minimal precipitation, receiving only 6 mm (0.2 in) over just one day, while April sees significantly more rainfall, accumulating 117 mm (4.6 in) over 15 days. Despite the slight difference in humidity—82% in July compared to 83% in April—the overall climate in July is much drier and warmer. For more detailed weather insights, check out Portland weather in April.

When comparing the weather in July and May, it's evident that July offers much warmer temperatures, with an average of 21°C (69°F) compared to May's cooler average of 14°C (58°F). July's maximum temperature can soar up to 37°C (99°F), while May peaks at a milder 32°C (90°F). In terms of precipitation, July is significantly drier, with only 6 mm (0.2 in) falling on just 1 day, whereas May experiences much wetter conditions, totaling 58 mm (2.3 in) over 10 days. Both months have similar humidity levels, hovering around 82-83%. For a closer look at the specifics of May's weather, you can check Portland weather in May.

When comparing the weather in July and June, we see some notable differences. July typically features milder temperatures, with a minimum of 9°C (49°F) and an average of 21°C (69°F), while June starts slightly cooler, with temperatures reaching a minimum of 6°C (43°F) and an average of 18°C (64°F). However, June experiences more extreme highs, peaking at 47°C (118°F), compared to July’s maximum of 37°C (99°F). Additionally, June sees significantly more precipitation, amounting to 46 mm (1.8 in) over 8 days, while July enjoys less rain, with only 6 mm (0.2 in) on just 1 day. Humidity levels remain quite similar, at 82% in July and 83% in June. For more detailed information, you can check out Portland weather in June.

In July, temperatures in the region typically range from a minimum of 9°C (49°F) to a maximum of 37°C (99°F), with an average of 21°C (69°F). The month tends to be relatively dry, receiving only 6 mm (0.2 in) of precipitation over the span of just one day, while humidity remains high at 82%.

In contrast, August experiences slightly warmer conditions, with temperatures reaching a maximum of 40°C (104°F) and an average of 21°C (70°F), though the minimum stays nearly the same at 9°C (48°F). Precipitation increases to 8 mm (0.3 in) across two days, and humidity drops to 74%, making for a somewhat drier atmosphere. For more details on the weather patterns you can expect, check Portland weather in August.

In comparing the weather between July and September, July tends to be warmer with an average temperature of 21°C (69°F), while September sees a drop to an average of 18°C (64°F). July boasts a maximum temperature reaching up to 37°C (99°F), compared to September's peak of 35°C (95°F). Precipitation is significantly lower in July, with only 6 mm (0.2 in) over just one day, in contrast to September's 62 mm (2.4 in) spread across eight days. Additionally, July's humidity is higher at 82%, while September experiences a more comfortable 71%. For more detailed information on September weather, you can check out this Portland weather in September.

July and October showcase a stark contrast in weather patterns. In July, temperatures typically range from a mild 9°C (49°F) at night to a scorching maximum of 37°C (99°F) during the day, accompanied by low precipitation of just 6 mm (0.2 in) over only one day. The high humidity level at 82% adds to the summer heat. In contrast, October experiences cooler temperatures, with a minimum of -2°C (29°F) and an average temperature of 12°C (53°F), peaking at 26°C (79°F). The month also brings significantly more rainfall, with 105 mm (4.1 in) spread over 12 days, maintaining a humidity level of 81%. For a detailed look at weather trends, check out Portland weather in October.

July and November present stark contrasts in weather. July boasts warm temperatures, with minimums around 9°C (49°F) and a maximum of 37°C (99°F), while averaging a pleasant 21°C (69°F). The month is typically dry, receiving just 6 mm (0.2 in) of precipitation across only one day, and features high humidity at 82%. In contrast, November brings a significant drop in temperatures, ranging from a chilly -5°C (24°F) to a mild 19°C (67°F), averaging just 8°C (47°F). This month is much wetter, with a substantial 155 mm (6.1 in) of rainfall expected over 18 days and humidity increasing slightly to 87%. For more detailed insights into current conditions, check out Portland weather in November.

July and December present contrasting weather patterns in Portland. In July, temperatures soar with a minimum of 9°C (49°F) and a maximum reaching up to 37°C (99°F), resulting in an average of 21°C (69°F). The month is relatively dry, experiencing only 6 mm (0.2 in) of precipitation over just one day, accompanied by high humidity at 82%. In stark contrast, December brings much colder temperatures, with a minimum of -5°C (24°F), an average of 5°C (41°F), and a maximum of 16°C (60°F). This month is characterized by significant rainfall, accumulating 183 mm (7.2 in) over 19 days, and slightly higher humidity at 87%. For a deeper look into what December has to offer, check out Portland weather in December.

Compare Portland's Climate with Cities Worldwide

Conclusion: What to Expect From July Weather in Portland

In July, Portland basks in warm temperatures, standing out distinctly from the cooler months of the year. With average highs around 21°C, the city offers pleasant days that are perfect for enjoying the outdoors. The month typically sees very little rainfall, adding to the allure of summer activities, while the humidity hovers at a comfortable 82%, making warm evenings ideal for gatherings. This unique combination of sun and minimal precipitation sets July apart, inviting both residents and visitors to explore all that Portland has to offer. For more details on the weather patterns throughout the year, check out Portland Climate.