Last updated: February 24, 2025
In January, Portland, United States experiences a diverse range of weather conditions, with temperatures fluctuating from a maximum of 15°C (59°F) to a chilling minimum of -14°C (7°F), contributing to an average temperature of 5°C (42°F). This month sees significant precipitation, totaling 163 mm (6.4 in) over approximately 17 days, leading to a notably high humidity level of 85%. The combination of cold snaps and dampness creates a unique winter atmosphere, making January in Portland both challenging and intriguing for residents and visitors alike.
In January, Portland experiences a diverse range of temperatures, starting with a brisk minimum of -14°C (7°F) and peaking at a maximum of 15°C (59°F). The month settles into an average temperature of 5°C (42°F), providing a cool but manageable climate for residents and visitors alike. This initial chill hints at the gradual warming that follows in February, where temperatures rise slightly, with minimums reaching -7°C (19°F) and maximums climbing to 17°C (63°F). As the months progress into spring, the trend becomes increasingly clear: temperatures steadily rise, transforming from the cold grips of winter to the milder embrace of early spring, with notable fluctuations inviting a dynamic weather experience in this vibrant city.
In January, Portland typically experiences significant rainfall, with an average precipitation of 163 mm (6.4 in) over 17 days, setting a wet tone for the year. This pattern continues into February, where rainfall slightly increases to 172 mm (6.8 in) across 19 days, making it one of the rainier months. As spring approaches, precipitation begins to taper off, with March witnessing a drop to 135 mm (5.3 in), followed by April’s lighter 117 mm (4.6 in). By May, the city starts to dry out remarkably, with only 58 mm (2.3 in) expected. July and August are particularly dry, each with less than 10 mm, showcasing the stark contrast to the wet winter months. As summer fades into fall, precipitation levels gradually rise again, culminating in December's 183 mm (7.2 in), echoing January's heavy rainfall and reinforcing Portland's reputation for a rainy climate. Overall, this data illustrates Portland's dynamic weather, characterized by a moist winter followed by a relatively dry summer.
In January, Portland's humidity sits at a substantial 85%, setting the tone for a month characterized by its cool, damp climate. This high level of moisture persists throughout the winter, with February dipping slightly to 84% but rising again in November and December, where the humidity reaches 87%. Interestingly, the spring months show a subtle decline, with April and May maintaining a consistent 83%, while summer brings a notable decrease, peaking in August at 74%. As autumn approaches, humidity levels begin to rise again, illustrating a cyclical trend that aligns with Portland's temperate coastal climate, where the dampness of winter is balanced by the drier heat of summer.
In January, Portland experiences a low UV Index of 2, indicating minimal sun exposure risk, with the average burn time stretching to 45 minutes. As winter transitions into spring, there is a noticeable trend of increasing UV levels: February's index rises to 3, and by March, it reaches 5, both categorized as moderate exposure with a consistent burn time of 30 minutes. This upward trajectory continues into April, where the UV Index jumps to 6, marking the shift into high exposure. The summer months of May through August see the index peak at 10 in June and July, representing very high exposure with a swift 15-minute burn time. As fall approaches, UV levels gradually decline, offering a respite in September at 7 and tapering back to a low of 2 by December. This clear seasonal pattern underscores the importance of sun protection as the months become warmer. For more detailed insights, visit Portland UV Index.
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In January, Portland experiences a modest 88 hours of sunshine, setting the stage for a gradual increase as the year progresses. By February, the days grow brighter with 123 hours of sunlight, hinting at the promise of spring. As March arrives, the city begins to bask in 195 hours of sunshine, signaling a delightful transition into warmer months. This pattern continues into April and May, where Portlanders enjoy 229 and 282 hours respectively, showcasing a vibrant surge in daylight. The summer months peak in June and July with 318 and 374 hours of radiant sunshine, inviting outdoor adventures and community gatherings. However, as the year wanes, sunshine hours gradually decline, with 335 hours in August and slipping to 268 by September, thereby ushering in the brisk autumn chill. Finally, the year closes with 211 hours in October, tapering to 136 in November and a mere 115 in December, reminding us of the cyclical dance between light and shadow that characterizes Portland’s seasonal tapestry.
In January, the likelihood of sunny weather in Portland remains quite low, with only a 16% chance of sunshine gracing the overcast skies. This trend continues into February, slightly improving to 17%, highlighting the typically gloomy winter months in the Pacific Northwest. As spring approaches, the chances of enjoying sunnier days notably increase, soaring to 38% by March and further rising to 54% in April. This gradual transition sets the stage for summertime, where June peaks at 63%, followed by a sunny July at 74%. Interestingly, the trend then sees a decline toward the fall, dropping back to 30% in October and down to 16% again by November. Overall, while January offers little in terms of sunshine, the gradual blossoming of clearer skies throughout the year brings hope for brighter days ahead.
In January, Portland experiences a modest 9 hours of daylight, marking the depth of winter. As the month unfolds, the days gradually lengthen, reaching a delightful 10 hours in February. By March, the daylight extends to 11 hours, heralding the arrival of spring. The increase becomes even more pronounced in April, with 13 hours of sunshine fueling growth and blossoming landscapes. This trend continues into May and June, where daylight peaks at 14 and 15 hours, respectively, providing ample opportunities for outdoor activities under the vibrant summer sun. As summer wanes in July, daylight remains abundant but begins to taper off, recorded at 15 hours. The decline continues in August with 13 hours, followed by gradual reductions in September and October, where daylight dwindles to 12 and 10 hours. As the year closes in November, daylight returns to 9 hours, and ultimately descends to 8 hours in December, completing the seasonal cycle and paving the way for the next year's awakening.
In January, the wind in Portland begins the year with a gentle average speed of 2.4 m/s (5 mph), setting a calm tone for the winter month. Interestingly, winds shift slightly in February, increasing to 2.9 m/s (6 mph), hinting at a transitioning atmosphere as the season progresses. However, as spring approaches, March and April see a return to calmer conditions, each hovering around 2.2 m/s (5 mph). This trend of mild variability continues through the late spring and summer months, stabilizing around 2.4 m/s (5 mph), before dipping slightly in August and September. As autumn arrives, wind speeds experience a subtle uptick, peaking again at 2.8 m/s (6 mph) in November. Ultimately, January's breezes reflect a broader patterns of seasonal shifts, showcasing Portland's characteristic, albeit gentle, winds throughout the year.
The weather in Portland changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of January'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.
January and February exhibit similar average temperatures, both hovering around 5°C (41°F), but February typically enjoys slightly milder conditions with a higher maximum temperature of 17°C (63°F) compared to January's 15°C (59°F). However, the minimum temperature in January dips lower, averaging -14°C (7°F), while February’s minimum is a more moderate -7°C (19°F). Precipitation remains high in both months, with January receiving 163 mm (6.4 in) over 17 days and February seeing a slight increase to 172 mm (6.8 in) across 19 days. Humidity is also comparable, with January at 85% and February slightly lower at 84%. For more detailed insights, check out Portland weather in February.
January and March present notably different weather patterns. In January, temperatures can plummet to a chilling low of -14°C (7°F), with an average temperature of around 5°C (42°F) and a high reaching up to 15°C (59°F). The month experiences significant precipitation, totaling 163 mm (6.4 in) over 17 days, accompanied by high humidity at 85%. In contrast, March brings a milder climate, with minimum temperatures around -4°C (26°F) and an average of 8°C (46°F), peaking at a warm 24°C (75°F). Precipitation decreases slightly to 135 mm (5.3 in), occurring over the same number of days, while humidity remains consistent at 85%. For a more detailed comparison of weather conditions, you can explore Portland weather in March.
In January, the weather is significantly colder, with minimum temperatures plunging to -14°C (7°F) and an average temperature of around 5°C (42°F). The month experiences considerable precipitation, totaling 163 mm (6.4 in) over 17 days, along with high humidity levels at 85%. In contrast, April brings a noticeable warming trend, featuring minimum temperatures of -1°C (31°F) and an average temperature of 11°C (51°F), with highs reaching up to 29°C (84°F). Although April also has some precipitation, it is lower than January at 117 mm (4.6 in) spread over 15 days, and the humidity slightly decreases to 83%. For more details, you can explore Portland weather in April.
In January, the weather is significantly colder, with temperatures ranging from a minimum of -14°C (7°F) to a maximum of 15°C (59°F), and an average temperature of 5°C (42°F). The month experiences high precipitation of 163 mm (6.4 in) over 17 days, coupled with a humidity level of 85%. In contrast, May brings a warmer climate, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 32°C (90°F), and an average of 14°C (58°F). Precipitation decreases to 58 mm (2.3 in) over just 10 days, while humidity slightly lowers to 83%. For a more detailed look at what to expect, check out Portland weather in May.
In January, the weather is notably colder, with temperatures ranging from a chilling minimum of -14°C (7°F) to a mild maximum of 15°C (59°F) and an average of around 5°C (42°F). The month is quite wet, receiving 163 mm (6.4 in) of precipitation over 17 days, accompanied by high humidity levels of 85%. In contrast, June brings a significant warming trend, with temperatures starting from a minimum of 6°C (43°F) and reaching as high as 47°C (118°F), averaging around 18°C (64°F). Precipitation drops drastically to 46 mm (1.8 in) over just 8 days, while humidity remains relatively low at 83%. For more details, you can check out Portland weather in June.
In January, Portland experiences chilly temperatures, with a minimum of -14°C (7°F) and an average of 5°C (42°F), peaking at a maximum of 15°C (59°F). The month is also quite wet, receiving about 163 mm (6.4 in) of precipitation over 17 days, and the humidity is relatively high at 85%. In contrast, July brings a significant warming trend, boasting a minimum temperature of 9°C (49°F) and averaging 21°C (69°F), with highs reaching up to 37°C (99°F). Precipitation is minimal in July, totaling only 6 mm (0.2 in) over just 1 day, and the humidity remains slightly lower at 82%. For more specifics about the weather in Portland during July, visit Portland weather in July.
January and August present stark contrasts in weather patterns. In January, temperatures can drop as low as -14°C (7°F), with an average of around 5°C (42°F) and occasional highs reaching 15°C (59°F). This month is characterized by significant precipitation, totaling 163 mm (6.4 inches) over 17 days, and a high humidity level of 85%. In contrast, August boasts milder conditions, with temperatures ranging from a minimum of 9°C (48°F) to a maximum soaring up to 40°C (104°F), and an average of 21°C (70°F). Rainfall is scarce, amounting to only 8 mm (0.3 inches) on just 2 days, while humidity levels decrease to a more comfortable 74%. For a deeper look at the differences in August weather, you can visit Portland weather in August.
January and September present a striking contrast in weather. January experiences colder temperatures, with minimums dropping to -14°C (7°F) and average highs around 5°C (42°F). The month is also characterized by significant precipitation, totaling 163 mm (6.4 in) over 17 days, alongside high humidity levels at 85%. In contrast, September enjoys much milder temperatures, with minimums around 6°C (42°F) and average highs peaking at 18°C (64°F), reaching maximums as high as 35°C (95°F). September is drier too, with only 62 mm (2.4 in) of precipitation over just 8 days and lower humidity at 71%. For more details, you can check Portland weather in September.
Comparing the weather in January and October reveals significant differences in temperature and precipitation. In January, temperatures can plummet to a minimum of -14°C (7°F), with an average of 5°C (42°F) and a maximum of 15°C (59°F). The month is characterized by high humidity at 85% and considerable precipitation of 163 mm (6.4 in) over 17 days. In contrast, October offers milder temperatures, ranging from a minimum of -2°C (29°F) to a pleasant average of 12°C (53°F) and a maximum of 26°C (79°F). With lower precipitation at 105 mm (4.1 in) over 12 days and slightly decreased humidity at 81%, October presents a much more temperate climate. For more details on October weather, you can visit Portland weather in October.
January and November showcase distinct weather patterns, with January typically being colder. In January, temperatures range from a minimum of -14°C (7°F) to a maximum of 15°C (59°F), averaging around 5°C (42°F), while November sees milder temperatures with a minimum of -5°C (24°F) and a maximum of 19°C (67°F), averaging 8°C (47°F). Precipitation is similar in both months, with January receiving 163 mm (6.4 in) over 17 days and November slightly less at 155 mm (6.1 in) over 18 days. Humidity levels are also comparable, with January at 85% and November slightly higher at 87%. For more insights, check out Portland weather in November.
In comparing the weather between January and December, we observe that both months have similar average temperatures, with January featuring a minimum of -14°C (7°F), an average of 5°C (42°F), and a maximum of 15°C (59°F). In contrast, December's minimum temperature is slightly milder at -5°C (24°F), with a similar average of 5°C (41°F) and a maximum of 16°C (60°F). Precipitation levels are also notable; January sees 163 mm (6.4 in) across 17 days, while December has a slightly higher total of 183 mm (7.2 in) over 19 days. Humidity remains high in both months, with January at 85% and December at 87%, contributing to a damp climate typical of winter in the region. For a more detailed look at the specifics, check out Portland weather in December.
As January settles in Portland, the city experiences a distinct shift in weather patterns compared to other months. With a chilly average temperature hovering around 5°C (42°F), and occasional frosty nights plunging down to -14°C (7°F), residents are met with bone-chilling cold. This month is also marked by significant precipitation, accounting for 163 mm (6.4 in) over 17 days, contributing to the city's characteristic humidity of 85%. This dampness, coupled with a mix of rain and the occasional snow, creates a unique atmosphere that contrasts with the warmer, drier days that spring and summer bring. For a deeper look into Portland's weather trends, you can explore more at Portland Climate.