Last updated: February 24, 2025
In March, Portland experiences a transition into spring, characterized by a diverse range of temperatures and notable precipitation. Daily highs peak at around 13°C (56°F), while the average temperature hovers at a chilly 1°C (34°F), dipping as low as -15°C (6°F) during cold snaps. With 91 mm (3.6 in) of rainfall spread across 9 days, residents can expect a mix of rainy and dry spells. The humidity remains high at 82%, contributing to a brisk atmosphere that signals the impending shift to warmer seasons.
In March, Portland transitions from the harsh chill of winter toward the hint of spring, with temperatures reflecting this gradual change. The month starts with minimums around -15°C (6°F), which still echo the lingering cold, yet the average climbs to 1°C (34°F), offering a glimpse of warmer days ahead. The maximum temperature reaches 13°C (56°F), paving the way for a notable shift as April nears. This pattern not only highlights a gradual warming trend compared to the preceding months but also serves as a gentle reminder that the beauty of spring is just around the corner, inviting both residents and visitors to embrace the emerging thaw.
March in Portland sees a moderate rainfall of 91 mm (3.6 in), slightly below the preceding months, with precipitation occurring over 9 days. This month serves as a transition from the typically wetter winter months, like January and February, which each delivered over 97 mm and 103 mm respectively. As spring approaches, the precipitation tends to include more sporadic showers, setting the stage for the increased rainfall that April brings with its average of 149 mm (5.9 in). Overall, March's weather reflects the region's characteristic variability, bridging the more intense winter deluge to the fresh, blossoming days of spring.
March in Portland brings a slight dip in humidity, with levels averaging 82%. This marks a continuation of the gradual decrease that begins in the heart of winter, as January and February boast higher humidity at 86% and 84%, respectively. The trend suggests a shift towards drier conditions as spring approaches, inching down to 80% by April. With this decrease, residents can expect a refreshing change as the air begins to feel lighter, signaling the arrival of blooming flowers and outdoor activities. As the year progresses, humidity continues to decline, giving way to the drier summer months ahead.
As spring approaches in Portland, the UV Index climbs steadily, reflecting the increasing intensity of the sun. In March, the UV Index reaches 5, categorized as moderate, which means it's time to start being more mindful of sun exposure—especially since the burn time is just 30 minutes. This trend marks a notable shift from January and February, where the UV Index remained at relatively low levels. Looking ahead, April will see a further rise to 7, indicative of high exposure risks. So, whether you’re venturing outdoors for a hike or simply enjoying the blooming scenery, it’s essential to stay protected. For more insights on seasonal UV trends, check out Portland UV Index.
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March in Portland marks a delightful turning point as sunshine hours blossom to 256, a noticeable increase from February’s 182. This transition into spring brings longer days and a rejuvenating warmth, sparking a collective sense of optimism among residents. As the city shakes off the winter chill, the leap to March serves as a precursor to the even sunnier months ahead. April follows closely with 244 hours, a slight dip, but still indicative of the growing daylight. The upward trend from the start of the year signals a clear shift in Portland’s climate, inviting everyone to bask in the increasing brightness and prepare for the vibrant outdoor activities that spring brings.
As March rolls around in Portland, the promise of sunshine begins to blossom, with the likelihood of clear skies rising to an impressive 61%. This marks a notable increase compared to the dreariness of January and February, which linger around 39% and 34% respectively. The trend continues into the spring, as April sees a dip to 36%, but the sun makes a more frequent appearance during March, providing a refreshing change after the winter gloom. Interestingly, the chances of sun fluctuate throughout the spring and summer months, with May and June showing similar percentages hovering in the 37-40% range. Despite the unpredictability of Portland's weather, March stands out as a beacon of hope for outdoor enthusiasts yearning for milder, sunnier days.
As winter fades and spring begins to unfold, March in Portland brings a welcome increase in daylight, boasting a total of 11 hours. This gradual transition from the shorter days of winter—where January and February offer just 9 and 10 hours respectively—signals a shift towards more sunlit hours, culminating in the lush vibrancy of spring. Each month sees an upward trend; by April, daylight extends to 13 hours, and the promise of summer shines brightly with 14 hours in May and 15 hours in June and July. As the year progresses, the rhythm of daylight ebbs in late summer, only to return again, creating a cycle that shapes life in this dynamic city.
As winter transitions to spring, March in Portland brings a noticeable uptick in average wind speed, reaching 5.3 m/s (12 mph)—the highest of the year. This refreshing breeze signals the onset of milder weather, invigorating the city as it shakes off the chill of winter months. February's brief lull with 4.7 m/s (11 mph) gives way to a gentle but noticeable increase, before winds gradually begin to taper off into the warmer summer months ahead. April follows closely with a slight decline to 4.6 m/s (10 mph), hinting at a trend of fluctuating winds that will vary throughout the year, while still reminding residents of the brisk, lively air that characterizes the robust spirit of Portland in March.
The weather in Portland changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of March'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.
In comparing the weather between January and March, we see significant differences in temperature and humidity. January tends to be colder, with average temperatures hovering around -2°C (28°F) and nighttime lows reaching as low as -19°C (-2°F). In contrast, March begins to warm up, featuring an average temperature of 1°C (34°F) and maximum highs of 13°C (56°F). While both months experience similar levels of precipitation—around 91 mm (3.6 in) in March and 97 mm (3.8 in) in January—the relative humidity is slightly lower in March at 82%, compared to January’s 86%. For more specific insights about January weather in Portland, you can check Portland weather in January.
In March, the weather begins to warm up slightly compared to February, with average temperatures rising from -2°C (29°F) to around 1°C (34°F). While both months experience similar maximum temperatures, March has a milder minimum temperature of -15°C (6°F) compared to February’s colder -17°C (2°F). Precipitation in March is slightly lower at 91 mm (3.6 in) over 9 days, compared to February's 103 mm (4.1 in) across 10 days, indicating a somewhat drier month. Humidity remains similar, with March at 82% and February at 84%. For a more detailed look at February's weather in Portland, check out Portland weather in February.
March and April exhibit a notable transition in weather patterns. In March, temperatures range from a chilly minimum of -15°C (6°F) to a maximum of 13°C (56°F), with an average hovering around 1°C (34°F). The month sees significant precipitation, totaling 91 mm (3.6 in) over approximately 9 days, accompanied by a relatively high humidity level of 82%. As we move into April, the temperatures rise considerably, with minimums around -3°C (27°F) and maximums reaching 18°C (65°F), resulting in an average temperature of 6°C (43°F). April also experiences increased precipitation of 149 mm (5.9 in) over 13 days, yet the humidity level slightly decreases to 80%. For a more detailed look at the weather in April, check out Portland weather in April.
March and May show a distinct transition in weather patterns. In March, temperatures range from a chilly minimum of -15°C (6°F) to a maximum of 13°C (56°F), with an average temperature around 1°C (34°F). Precipitation in March is significant, totaling 91 mm (3.6 in) over approximately 9 days, accompanied by high humidity levels at 82%. In contrast, May brings warmer temperatures, with a minimum of 2°C (36°F), an average of 11°C (52°F), and a maximum reaching 24°C (76°F). Although May experiences only slightly more precipitation at 94 mm (3.7 in) across 10 days, the humidity drops to a more comfortable 72%. This change in weather reflects the gradual warming trend as spring progresses into early summer. For more detailed information on May weather, check out Portland weather in May.
March and June exhibit stark contrasts in weather patterns. March is characterized by much colder temperatures, with minimums dropping to -15°C (6°F) and an average temperature of just 1°C (34°F), while June boasts a much warmer range, starting from a minimum of 8°C (47°F) and averaging 17°C (62°F). Precipitation levels are relatively similar, with March receiving 91 mm (3.6 in) and June slightly less at 80 mm (3.2 in), although both months typically see precipitation on about 9 days. The humidity in March is higher at 82%, compared to June's 72%, making for a much brisker feel during the earlier month. For more information on June’s weather, check out Portland weather in June.
March and July present starkly contrasting weather experiences, with March featuring frigid temperatures ranging from a chilly minimum of -15°C (6°F) to a mild maximum of 13°C (56°F), and an average temperature hovering around 1°C (34°F). This month also sees considerable precipitation, totaling 91 mm (3.6 in) over approximately 9 days, accompanied by high humidity levels at 82%. In comparison, July boasts a much warmer climate, with temperatures ranging from a comfortable minimum of 13°C (56°F) to a peak of 28°C (83°F), averaging around 20°C (68°F). The summer month experiences higher rainfall at 123 mm (4.9 in) across about 12 days, though with a notably lower humidity of 67%. For a detailed look at Portland's weather in July, you can visit Portland weather in July.
The weather in March is markedly colder than in August, with temperatures ranging from a chilly minimum of -15°C (6°F) to a maximum of 13°C (56°F), while August boasts much milder temperatures, with a minimum of 14°C (57°F) and a maximum of 28°C (82°F). March sees a higher average precipitation of 91 mm (3.6 in) over 9 days, contributing to its damp and icy feel, contrasted with August's lower precipitation of 75 mm (3.0 in), which also occurs over the same number of days but under warmer, sunnier skies. Additionally, March has a significantly higher humidity level of 82%, while August enjoys a more comfortable humidity of 66%. For more specific details about August weather, you can check this link: Portland weather in August.
March and September exhibit contrasting weather patterns, reflecting the transition from winter to autumn. In March, temperatures typically range from a chilling minimum of -15°C (6°F) to a mild maximum of 13°C (56°F), with an average of around 1°C (34°F). This month sees substantial precipitation, averaging 91 mm (3.6 in) over about 9 days, along with high humidity levels at 82%. In stark contrast, September boasts much warmer temperatures, with minimums of 8°C (46°F) and maximums reaching 26°C (79°F), resulting in a comfortable average of 17°C (63°F). The month is drier, with 77 mm (3.0 in) of precipitation spread over just 8 days, and a more manageable humidity of 71%. For a closer look at the climate specifics in September, check out Portland weather in September.
March and October weather present distinct contrasts in temperature and precipitation. In March, temperatures range from a chilly minimum of -15°C (6°F) to a maximum of 13°C (56°F), with an average of around 1°C (34°F). Precipitation levels average 91 mm (3.6 in) over about 9 days, accompanied by a high humidity of 82%. In contrast, October sees much milder temperatures, with a minimum of 1°C (34°F), an average of 12°C (54°F), and a maximum of 21°C (71°F). The month experiences increased precipitation, totaling 163 mm (6.4 in) across 13 days, while humidity is slightly lower at 78%. For further details, you can check out Portland weather in October.
In March, temperatures typically range from a minimum of -15°C (6°F) to a maximum of 13°C (56°F), with an average of around 1°C (34°F). The month sees approximately 91 mm (3.6 in) of precipitation over about 9 days, accompanied by a humidity level of 82%. In contrast, November experiences slightly milder temperatures, with lows around -12°C (11°F) and highs reaching 18°C (64°F), averaging at 5°C (42°F). This month also receives more precipitation, totaling 130 mm (5.1 in) over approximately 12 days, and maintains a high humidity level of 84%. For those interested in more detailed information, check out Portland weather in November.
In comparing the weather of March and December, both months experience chilly temperatures, but March generally comes with a slightly milder average temperature of 1°C (34°F) compared to December's 0°C (33°F). December tends to have a lower minimum temperature, dropping to -18°C (-1°F), while March's minimum is a bit warmer at -15°C (6°F). Precipitation is more significant in December, with 144 mm (5.7 in) over 10 days, compared to March's 91 mm (3.6 in) over 9 days. Humidity levels remain similar in both months, hovering around 81-82%. For a closer look at what to expect, you can check out Portland weather in December.
As March unfolds in Portland, it marks a transitional period in weather dynamics, blending the winter's chill with the optimism of spring. Temperatures begin to rise, but the mix of bitterly cold nights and mild days can be a rollercoaster, making it distinct from both the brisk winter months and the warming days to come. Frequent precipitation—often manifesting as rain—contributes to the noteworthy humidity, creating an atmosphere that feels both refreshing and damp. As the landscape awakens from its winter slumber, March serves as a reminder of the dynamic and ever-changing climate typical of Portland. For a deeper dive into how these conditions compare year-round, visit Portland Climate.