Last updated: February 24, 2025
Experience the delightful May weather in Viana do Castelo, Portugal, where the average temperature hovers around 16°C (61°F), peaking at a warm 29°C (84°F) on the hottest days. While the charming coastal town basks in sunshine, it also encounters about 106 mm (4.2 in) of rain spread across 9 days, contributing to an overall humidity of 78%. This blend of warm days and refreshing showers creates a vibrant atmosphere, perfect for exploring the picturesque landscapes and rich culture of Viana do Castelo.
In Viana do Castelo, May heralds the arrival of warmer weather, with temperatures beginning to shift remarkably from the cooler months. The minimum temperature rises to a mild 6°C (43°F), while the average comfortably sits at 16°C (61°F), inviting locals and visitors alike to embrace the outdoors. As the month progresses, the maximum temperature can soar to a delightful 29°C (84°F), presenting perfect conditions for seaside activities and sun-soaked strolls along the picturesque coastline. This upward trend in temperatures from the previous months reflects the vibrant transition into summer, making May a particularly charming time to experience the beauty of this coastal gem.
In May, Viana do Castelo experiences a noticeable decrease in precipitation, with a total of 106 mm (4.2 in) spread over just 9 days, marking the transition to drier summer months. This drop follows the wetter spring months of April and earlier, where precipitation levels consistently hovered above 160 mm. Compared to the deluges of January through April, May showcases a refreshing lightness, hinting at the impending summer warmth. The pattern of decreasing rainfall continues into June, where only 59 mm (2.3 in) is recorded, suggesting that Viana do Castelo is shifting towards its sunnier season, while still benefiting from the lush greenery brought on by the earlier rains.
In May, Viana do Castelo, Portugal, experiences a comfortable humidity level of 78%, reflecting a slight dip as spring edges towards summer. This level is consistent with the trends observed from the previous months; humidity begins to decline from the winter highs of 87% in January and 81% in February, gradually easing down to 79% in April. As the year progresses, the region transitions into a drier season, with June and July expected to bring even more relief with humidity levels dropping to 71% and 63%, respectively. This gradual decrease not only enhances outdoor activities but also signals the onset of warmer weather, allowing residents and visitors to enjoy the lush landscapes and coastal beauty of this charming Portuguese town.
In May, Viana do Castelo experiences a striking UV Index of 9, placing it in the very high exposure category, with a burn time of just 15 minutes. This marks a continuation of elevated UV levels that ramp up significantly from the moderate index of 4 in February to an impressive peak in April and May. As the month progresses, residents and visitors should remain vigilant about sun protection, as UV exposure can lead to skin damage in a matter of minutes. The trend towards higher UV indices during the spring months highlights the importance of staying informed about sun safety. To learn more about the UV conditions throughout the year, visit Viana do Castelo UV Index.
UV Risk Categories
May brings a delightful surge of sunshine to Viana do Castelo, with an impressive 405 hours of sunlight that signifies the true arrival of spring. This sets the stage for a stunning upward trend that begins in the earlier months, where the hours gradually increase from 156 in January to a blossoming 348 in April. Following May, the sunshine continues to peak in June and July, reaching a remarkable 427 hours in the height of summer. The gradual decline starts in August, but even then, the 395 hours of sun ensure that the warm months linger in memory long after the season changes. The overall trajectory showcases Viana do Castelo as a sunlit haven, with May serving as a pivotal moment in its annual solar journey.
In Viana do Castelo, Portugal, the likelihood of sunny weather in May maintains a moderate 46% chance of sunshine, reflecting a gradual warming trend as spring transitions into summer. While this is an improvement over the 40% chance in April, it still falls short of the sunnier spells of June and August, which boast 60% and 66% respectively. This trend suggests that while May offers a glimmer of sun-soaked days, visitors can expect more consistent sunshine in the following months, making it an ideal time for those who enjoy a touch of spring warmth before the summer heat arrives.
In Viana do Castelo, Portugal, daylight duration undergoes a delightful transformation as the year progresses. Starting from January with just 9 hours of daylight, the days gradually lengthen, reaching a peak of 15 hours in June. By May, the daylight stretches to 14 hours, ushering in the vibrant energy of spring and allowing residents and visitors alike to bask in the longer, sunnier days. Following this crescendo, daylight begins to wane slightly, tapering to 13 hours in August and continuing the slow decline into the fall months. This pattern highlights a distinct trend of prolonged daylight during the warmer months, inviting a rich tapestry of outdoor activities that celebrate the region’s stunning landscapes and lively culture.
In May, Viana do Castelo experiences a gentle average wind speed of 3.7 m/s (8 mph), marking a slight increase from the calmer winds of April. This transition into spring is characterized by a refreshing breeze, setting the stage for outdoor activities. As the months progress, wind speeds remain relatively stable, fluctuating between 3.1 and 4.9 m/s throughout the summer and early fall. Notably, the winds are at their peak in February, while the late spring and summer months, including May, enjoy a pleasant and moderate airflow. Overall, May serves as a beautiful bridge into the warmer months, where breezy days invite exploration and relaxation along the stunning coastline of Portugal.
The weather in Viana do Castelo 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 Viana do Castelo and find detailed weather information for every month.
May and January present contrasting weather patterns in Viana do Castelo. May enjoys warmer temperatures, ranging from a minimum of 6°C (43°F) to a maximum of 29°C (84°F), with an average of 16°C (61°F). The month sees a total precipitation of 106 mm (4.2 in) over about 9 days, accompanied by a humidity level of 78%. In contrast, January features cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 20°C (69°F), averaging 9°C (49°F). It experiences slightly higher precipitation at 136 mm (5.4 in) over approximately 10 days, alongside an increased humidity of 87%. For a more detailed look at January's climate, visit Viana do Castelo weather in January.
When comparing the weather in May and February, it's evident that May enjoys warmer temperatures, with an average of 16°C (61°F) compared to February's 11°C (52°F). The maximum temperatures also climb higher in May, reaching up to 29°C (84°F) versus February’s peak of 21°C (70°F). However, February experiences more precipitation, totaling 185 mm (7.3 in) over 13 days, while May sees less rain at 106 mm (4.2 in) across 9 days. Additionally, humidity levels are slightly higher in February, at 81%, compared to 78% in May. For a more detailed look at February weather, visit Viana do Castelo weather in February.
Comparing the weather in March and May reveals some notable differences. In March, temperatures range from a minimum of 2°C (37°F) to a maximum of 23°C (73°F), with an average of 12°C (53°F). This month also experiences higher precipitation, totaling 186 mm (7.3 in) over 13 days. In contrast, May offers a more pleasant climate, with temperatures ranging from 6°C (43°F) to 29°C (84°F) and an average of 16°C (61°F). While May still sees some rain, it is considerably less, with 106 mm (4.2 in) over just 9 days. Both months have the same humidity level of 78%, but May showcases a more favorable weather pattern for outdoor activities. For further details on March weather, you can check this link: Viana do Castelo weather in March.
When comparing the weather in April and May, it's noticeable that May generally offers warmer temperatures, reaching an average of 16°C (61°F) compared to April's average of 13°C (56°F). While both months experience a fair amount of humidity, May’s humidity sits at 78%, slightly less than April’s 79%. However, April sees higher precipitation levels, with 169 mm (6.7 in) over 13 days, while May has 106 mm (4.2 in) spread over just 9 days. For a detailed look at April's weather, you can check out Viana do Castelo weather in April.
In comparing the weather of May and June, we see a gradual transition as temperatures begin to warm. May features a minimum temperature of 6°C (43°F) and an average of 16°C (61°F), reaching a maximum of 29°C (84°F), alongside 106 mm (4.2 in) of precipitation over 9 days, resulting in a humidity level of 78%. In contrast, June starts off slightly warmer with a minimum of 9°C (48°F) and an average of 17°C (63°F), while the maximum temperature remains comparable at 28°C (84°F). Precipitation decreases to 59 mm (2.3 in) over just 7 days, and humidity drops to 71%. This shift indicates a drier and more stable climate as summer approaches. For more detailed information, check out Viana do Castelo weather in June.
May and July present distinctly differing weather patterns. In May, temperatures range from a cool minimum of 6°C (43°F) to a comfortable average of 16°C (61°F), with a peak reaching 29°C (84°F). This month experiences a higher amount of precipitation, totaling 106 mm (4.2 inches) over about 9 days, along with significant humidity at 78%. In contrast, July enjoys warmer temperatures, with a minimum of 11°C (53°F), an average of 20°C (67°F), and a maximum of 30°C (87°F). It is also drier, with only 26 mm (1.0 inch) of rainfall over 5 days and lower humidity at 63%. For more details, check out Viana do Castelo weather in July.
May and August present contrasting weather patterns. In May, temperatures range from a chilly minimum of 6°C (43°F) to a pleasant maximum of 29°C (84°F), with an average of 16°C (61°F). The month sees considerable rainfall, totaling 106 mm (4.2 in) over approximately 9 days, and maintains a high humidity level of 78%. In contrast, August offers warmer temperatures, with a minimum of 12°C (54°F) and a maximum reaching 32°C (90°F), while averaging 20°C (67°F). Precipitation drops dramatically to just 30 mm (1.2 in), occurring on only 3 days, and humidity decreases to 64%. This shift makes August a drier and warmer month, perfect for outdoor activities. For more details, check out Viana do Castelo weather in August.
May and September in Viana do Castelo present distinct weather patterns, showcasing a transition from spring to autumn. In May, temperatures range from a minimum of 6°C (43°F) to a maximum of 29°C (84°F), with an average of 16°C (61°F). The month experiences significant precipitation, totaling 106 mm (4.2 in) over 9 days, coupled with a higher humidity level of 78%. In contrast, September enjoys slightly warmer conditions, with a minimum of 10°C (50°F) and a maximum of 30°C (86°F), averaging 19°C (66°F). This month is drier, receiving just 49 mm (1.9 in) of rainfall over 6 days and a lower humidity level of 71%. For more detailed information on September weather, you can explore Viana do Castelo weather in September.
May and October display similar temperature ranges, with both months featuring minimums of 6°C (43°F), averages of 16°C (61°F), and maximums reaching 29°C (84°F). However, October tends to be wetter and slightly more humid, experiencing an increase in precipitation to 152 mm (6.0 in) over about 11 days, compared to May's 106 mm (4.2 in) across 9 days. The slight rise in humidity from 78% in May to 79% in October also contributes to a different feel in the air. For those interested in the specifics of October weather, you can find more information here: Viana do Castelo weather in October.
May and November in Viana do Castelo present contrasting weather experiences. In May, temperatures range from a minimum of 6°C (43°F) to a warm maximum of 29°C (84°F), with an average of 16°C (61°F). The month sees about 106 mm (4.2 in) of precipitation spread over 9 days, and a humidity level of 78%. In stark contrast, November is cooler, with temperatures dipping to a minimum of 3°C (38°F) and an average high of 21°C (70°F), resulting in an overall average of 12°C (54°F). Precipitation in November is significantly higher at 216 mm (8.5 in), occurring on about 15 days, coupled with increased humidity at 86%. For more detailed information, you can check Viana do Castelo weather in November.
May and December showcase contrasting weather patterns. In May, temperatures range from a minimum of 6°C (43°F) to a comfortable average of 16°C (61°F), with a warm maximum of 29°C (84°F). The month experiences moderate rainfall of 106 mm (4.2 in) over 9 days, contributing to a humidity level of 78%. In contrast, December presents cooler conditions with a minimum of 2°C (36°F) and an average temperature of just 11°C (52°F), peaking at 19°C (66°F). This month sees a significant increase in precipitation, totaling 246 mm (9.7 in) spread over 17 days, and a higher humidity of 87%. For more detailed information, check out Viana do Castelo weather in December.
As May unfolds in Viana do Castelo, the weather experience shifts intriguingly, painting a vibrant picture of spring in full bloom. With temperatures rising, you can expect delightful warm days, contrasting with the chill of the earlier months. While May brings an average of 16°C, there’s a range that sees highs reaching up to 29°C. However, don't forget your umbrella — this month often sees about 9 days of rain, amounting to 106 mm, resulting in a moderately humid atmosphere that can feel refreshing. This blend of warmth and occasional showers creates an inviting transition into summer, making May a unique and captivating time to explore. For more insights into the climatic nuances, check out Viana do Castelo Climate.