Last updated: February 24, 2025
Experience the charming May weather of Porto, Portugal, where temperatures can soar up to 30°C (87°F), while averaging a pleasant 17°C (63°F). Evenings may cool down to a refreshing 6°C (43°F), creating a delightful atmosphere for exploration. During this month, expect 81 mm (3.2 in) of precipitation over 9 days, contributing to the region's lush greenery. With humidity at 78%, the air carries the vibrant scents of blossoming flowers, inviting visitors to enjoy the city's stunning sights amidst a mild, Mediterranean climate.
In May, Porto, Portugal, truly warms up, marking the transition into delightful spring weather. With minimum temperatures rising to 6°C (43°F) and averages hovering around 17°C (63°F), you'll find the city vibrant and inviting. The maximum temperature can reach a pleasant 30°C (87°F), offering plenty of sunshine for outdoor explorations. This month stands out as a pivotal moment in the seasonal shift, where the temperatures not only climb significantly from April but also hint at the sun-soaked summer ahead. As you stroll along the picturesque streets of Porto, the blooming flowers and balmy breezes create a perfect backdrop for enjoying this lively coastal city.
May in Porto, Portugal marks a transition toward drier conditions, with precipitation dropping significantly to 81 mm (3.2 in) over about 9 days of rain. Compared to the preceding months, where rainfall peaked in April, these May figures signal the onset of summer as the city begins to enjoy sunnier spells. This decline in precipitation is part of an overall trend, as both the amounts and rainy days decrease through June, paving the way for the warm, dry months ahead. The lighter rainfalls in May not only offer a respite from the wet spring but also hint at an approaching summer, inviting locals and visitors alike to savor the improving weather.
In May, Porto, Portugal experiences a humidity level of 78%, which aligns closely with the patterns seen in the preceding months, particularly April's 79%. This slight decline suggests the city is gradually transitioning into the drier summer months. Notably, the humidity levels are significantly lower than the peak winter figures, which hover around 87% in January. As the humidity steadily decreases from spring into summer, residents and visitors can enjoy the onset of warm, pleasant days while still experiencing the lush beauty that Porto’s moderate humidity nurtures.
As May arrives in Porto, Portugal, the UV Index surges to 9, reflecting a very high exposure category. This is a notable increase from April's 8, underscoring a trend of intensifying sun intensity as spring progresses into early summer. With a burn time of just 15 minutes, it's essential for sun-seekers to take precautions, such as wearing sunscreen and protective clothing. This pattern of increasing UV levels continues into June, where the Index peaks at 11, indicating an even more urgent need for sun safety. To learn more about how to protect yourself from UV rays, check out the Porto UV Index.
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As spring blossoms into summer, May illuminates Porto, Portugal, with an impressive 405 hours of sunshine—a delightful herald of the sunny days to come. This month stands out brightly among its predecessors, showcasing a remarkable increase of 61 hours from April. Following the trend, June and July promise even more radiant days, peaking at 407 and 427 hours respectively. This steady ascent not only enhances Porto's vibrant charm but also invites visitors to embrace its rich culture under the warmth of the sun. As the year progresses, one can’t help but notice the gradual waning of daylight in the autumn months; however, May's abundant sunshine remains a cherished highlight, beckoning all to enjoy the city's scenic vistas bathed in golden light.
In May, Porto, Portugal experiences a 46% chance of sunny weather, marking a slight increase from the preceding months. This brings a refreshing shift as spring transitions into summer, positioning May as a promising time for those seeking sunshine. While the weather remains relatively unstable compared to the sunnier months of July and August, which boast chances of 57% and 64% respectively, the increase from the 39% chance in April indicates a budding trend toward more favorable conditions. As spring unfolds, visitors can anticipate a delightful blend of sunny spells and comfortable temperatures, making May an enticing month for exploration in this vibrant coastal city.
As spring transitions into summer in Porto, Portugal, the daylight duration markedly increases, providing a gradual and delightful shift from the shorter winter days. Starting in January with just 9 hours of daylight, the days gradually stretch, reaching 14 hours by May. This trend highlights a significant leap in sunshine, particularly from March onward, when the daylight extends from 11 hours to a vibrant 14 hours. This increasing illumination continues into June, peaking at 15 hours before subtly tapering off again in the summer months. As the year progresses, daylight hours reflect the rhythm of nature, offering opportunities for exploration and enjoyment under Porto's beautifully illuminated skies.
In May, Porto experiences a gentle average wind speed of 3.1 m/s (7 mph), a continuation of the mild breezes seen in the preceding months. While slightly higher than April's calmness at 2.5 m/s, May's winds remain manageable, setting the stage for pleasant outdoor activities. As we transition into the summer months, the wind speeds maintain a consistent trend, with June and July mirroring May's breeziness, further enhancing the city's vibrant atmosphere. Overall, May serves as a lovely bridge between the calm spring and the lively summer, inviting both locals and visitors to enjoy Porto's charming waterfront and open-air cafés.
The weather in Porto changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Porto and find detailed weather information for every month.
May and January offer distinctly different weather experiences. In May, temperatures start to rise, with averages around 17°C (63°F) and maxima reaching up to 30°C (87°F), providing a warm atmosphere for outdoor activities. On the other hand, January is much cooler, with an average temperature of 9°C (49°F) and highs of only 21°C (69°F). While both months see a similar amount of rainfall—81 mm in May and 91 mm in January—the heightened humidity in January at 87% compared to 78% in May can make it feel cooler. For more details on January's weather in Porto, check out Porto weather in January.
In comparing the weather between May and February, May tends to be significantly warmer, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 30°C (87°F), while February offers cooler conditions with temperatures between 1°C (34°F) and 21°C (71°F). February also experiences more precipitation, totaling 138 mm (5.4 in) over 11 days, compared to May's 81 mm (3.2 in) over 9 days. Interestingly, the humidity level remains relatively similar in both months, hovering around 78% in May and 81% in February. For a more detailed look at February's weather, you can explore Porto weather in February.
In comparing March and May weather, May generally offers a warmer climate with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 30°C (87°F), while March has cooler averages with temperatures between 3°C (38°F) and 26°C (79°F). Interestingly, despite May's higher temperatures, it experiences less precipitation, totaling 81 mm (3.2 in) over 9 days, compared to March's 141 mm (5.6 in) over 11 days. Both months share the same humidity level of 78%, but the overall feel in May is often sunnier and more conducive to outdoor activities. For more detailed information, you can check Porto weather in March.
When comparing the weather in April to that in May, we see a noticeable increase in temperatures. May's minimum temperature is 6°C (43°F), slightly higher than April’s 4°C (40°F), while the average temperature rises from 14°C (58°F) in April to 17°C (63°F) in May, and the maximum temperature can reach as high as 30°C (87°F), compared to April's maximum of 27°C (81°F). Precipitation levels also differ, with April receiving 146 mm (5.7 in) over 13 days, whereas May sees a decrease in rainfall to 81 mm (3.2 in) across 9 days, resulting in a drier climate as spring progresses. Humidity remains similar, with May at 78% and April slightly higher at 79%. For a more detailed look at April weather, you can check Porto weather in April.
May and June display a gradual warming trend, with June experiencing higher minimum, average, and maximum temperatures. In May, temperatures range from a low of 6°C (43°F) to a high of 30°C (87°F), while June sees a minimum of 10°C (50°F) and a maximum of 32°C (90°F). Precipitation in May is notably higher at 81 mm (3.2 in) over 9 days compared to June’s 50 mm (2.0 in) over 8 days, leading to lower humidity levels in June at 71% versus May's 78%. For those planning activities, the drier and warmer June weather may be more favorable. For more details, check out Porto weather in June.
May and July present a notable contrast in weather conditions. In May, temperatures range from a minimum of 6°C (43°F) to a maximum of 30°C (87°F), with an average of 17°C (63°F). The month experiences higher precipitation, with about 81 mm (3.2 in) falling over approximately 9 days, contributing to a humidity level of 78%. In contrast, July boasts warmer temperatures, with a minimum of 11°C (52°F), an average of 21°C (70°F), and a peak of 34°C (94°F). Precipitation dramatically decreases to just 23 mm (0.9 in) over 4 days, leading to a more comfortable humidity level of 63%. For more on July's specific weather, check out this link: Porto weather in July.
May and August present quite different weather experiences. In May, temperatures range from a chilly 6°C (43°F) at night to a warm 30°C (87°F) during the day, with an average temperature of 17°C (63°F). The month sees significant precipitation, with 81 mm (3.2 in) of rain over about 9 days, accompanied by relatively high humidity at 78%. In contrast, August offers warmer conditions, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 36°C (98°F), averaging 21°C (70°F). Rainfall drops dramatically to just 19 mm (0.7 in) over approximately 4 days, and humidity decreases to 64%. For a more detailed look at August weather, check out Porto weather in August.
May and September present distinct weather patterns, highlighting the transition between spring and autumn. In May, temperatures range from a cooler 6°C (43°F) at night to a warm 30°C (87°F) during the day, with an average of 17°C (63°F). The month experiences about 81 mm (3.2 in) of precipitation over approximately 9 days, coupled with a humidity level of 78%, making it feel quite moist. In contrast, September features milder temperatures with a minimum of 10°C (51°F) and a maximum of 34°C (94°F), averaging around 20°C (68°F). This month has significantly less rainfall, totaling only 39 mm (1.5 in) across 6 days, and a lower humidity of 71%. For more detailed insights, check out Porto weather in September.
May and October both feature similar minimum temperatures, averaging around 6°C (43°F), while their average temperatures hover around 17°C (63°F). However, October tends to have slightly higher maximum temperatures, reaching up to 31°C (88°F), compared to May's 30°C (87°F). Precipitation levels in October are notably higher, with 121 mm (4.8 in) across 10 days, in contrast to May's 81 mm (3.2 in) over 9 days. Additionally, humidity levels remain fairly comparable, with May at 78% and October at 79%. For more detailed insights into October weather, you can visit Porto weather in October.
May and November present contrasting weather patterns. In May, temperatures typically range from a minimum of 6°C (43°F) to a maximum of 30°C (87°F), with an average of 17°C (63°F). This month experiences moderate precipitation of 81 mm (3.2 in) over 9 days and a humidity level of 78%. In comparison, November brings cooler temperatures, with a minimum of 4°C (40°F), an average of 13°C (55°F), and a maximum of 21°C (71°F). Additionally, it sees increased precipitation of 156 mm (6.1 in) over 13 days and higher humidity at 86%. The shift in weather not only marks a drop in temperatures but also a significant increase in rainfall. For more details, check out Porto weather in November.
In May, the weather is generally warmer and more pleasant, with temperatures ranging from a minimum of 6°C (43°F) to a comfortable average of 17°C (63°F), peaking at around 30°C (87°F). The month sees about 81 mm (3.2 in) of precipitation over 9 days, with humidity levels at 78%. In contrast, December is cooler, with temperatures dropping to a minimum of 1°C (35°F) and an average of 11°C (52°F), only reaching a maximum of 18°C (65°F). December experiences significantly higher rainfall, totaling 187 mm (7.4 in) over 15 days and a humidity level of 87%. For more details about the weather during this time, you can check Porto weather in December.
In May, Porto transitions into a more pleasant climate, showcasing warmer days that beckon outdoor activities. With an average temperature of 17°C (63°F) and peaks reaching up to 30°C (87°F), it marks a noticeable increase compared to the cooler months. While precipitation is still observed with about 81 mm (3.2 in) over approximately 9 days, the humidity level of 78% adds a balmy feel to the air. Overall, May serves as a vibrant prelude to the summer months, offering an inviting blend of comfortable warmth and occasional rain. For a deeper dive into the seasonal patterns, visit Porto Climate.