Last updated: February 24, 2025
Viana do Castelo in August showcases a delightful summer ambiance, with maximum temperatures reaching up to 32°C (90°F) and an average temperature of 20°C (67°F), perfect for enjoying outdoor activities. Visitors can expect a pleasant mix of warm days and cool nights, as minimum temperatures drop to around 12°C (54°F). With only 30 mm (1.2 in) of precipitation over just 3 days, the month remains predominantly dry, allowing for plenty of sunshine. Humidity levels hover around 64%, providing a comfortable atmosphere for exploring the charming streets and stunning landscapes of this picturesque Portuguese coastal city.
In August, Viana do Castelo basks in warm and inviting temperatures, with minimums around 12°C (54°F) and maximums soaring to 32°C (90°F). This month marks the zenith of summer, reflected in the comfortable average of 20°C (67°F), perfect for beach outings and outdoor activities. As the temperatures rise progressively from earlier months—starting from a cool 9°C (48°F) in June to 11°C (53°F) in July—August truly embodies the essence of a Mediterranean summer. With its delightful warmth, Viana do Castelo becomes a captivating retreat, beckoning visitors to enjoy its stunning landscapes and vibrant culture under the sun.
In August, Viana do Castelo experiences a noticeable shift in precipitation patterns, marking a transition towards drier summer conditions. With only 30 mm (1.2 inches) of rainfall recorded over a mere 3 days, this month reflects a significant reduction from the earlier summer months, particularly July, which had just 26 mm. This decline in precipitation not only highlights the region's typically warm, dry summer climate but also indicates a prevailing trend of lower rainfall as the region moves towards autumn. As August wraps up, the periodic rain showers serve to rejuvenate the landscape, paving the way for the wetter months that follow, particularly with September showing an uptick to 49 mm of precipitation.
In August, Viana do Castelo experiences a slight uptick in humidity, reaching 64%, a trend that follows the declining levels seen during the summer months. After the peak humidity of 87% in January, the region witnesses a gradual decrease, hitting its lowest point of 63% in July. This seasonal shift reflects the transition from the dry summer to the more humid conditions of autumn, as humidity levels begin to rise again in September. Overall, the trend highlights the city's maritime climate, characterized by relatively high humidity year-round, but particularly pronounced in the colder months.
In August, Viana do Castelo experiences a UV Index of 9, placing it in the very high exposure category. This is a continuation of the trend seen in June and July, where values also peaked at 9 and 10, reflecting the intense summer sun. With a quick burn time of just 15 minutes, it's crucial for sun-seekers to remain vigilant and protect their skin during peak hours. As the summer winds down, the UV Index will start to decline, dropping to 7 in September. For those planning outdoor activities, understanding the changing UV Index can help ensure safety and enjoyment under the sun. For more details, visit Viana do Castelo UV Index.
UV Risk Categories
In Viana do Castelo, Portugal, the summer months bask in an abundance of sunlight, peaking in July with a dazzling 427 hours. As August arrives, the city's sun-soaked charm continues, offering a robust 395 hours of sunshine, perfect for enjoying the picturesque coastal landscapes. This slight decline signals the transition towards autumn, but September still graces visitors with a generous 346 hours of sun. The trend of increasing daylight hours from the beginning of the year culminates in the peak summer months, making Viana do Castelo a delightful destination for sun lovers. As the year progresses, sunlight hours gradually wane, with the cozy embrace of winter bringing 207 hours in November and 181 hours in December, yet the lingering warmth of summer lingers long in the memory.
In Viana do Castelo, Portugal, the likelihood of experiencing sunny weather shows a distinct upward trend as we move into the summer months. Notably, by August, the chance of sunny days peaks at 66%, making it one of the sunniest months of the year. This peak follows a gradual increase from 48% in January and fluctuates in the spring, reaching 60% in June and 55% in July. However, the sunny disposition doesn't just cap off summer; November also shares a 66% chance, hinting at a surprising burst of sunshine before the year's end. Overall, August stands out as an ideal time for sun-seekers, promising more days bathed in sunlight compared to earlier months.
In Viana do Castelo, Portugal, August marks a gentle transition as the daylight duration begins to wane, offering around 13 hours of light. This follows the peak of June, where the sun graces the region with a remarkable 15 hours. As summer unfolds, there’s a slight decrease in daylight from July's 14 hours, signaling the approach of autumn. September continues this trend with 12 hours, gradually leading to the shorter days of October and November. The rhythm of daylight in Viana do Castelo beautifully encapsulates the shifting seasons, with each month revealing a balance between the long, sun-drenched days of summer and the more subdued light of fall.
In Viana do Castelo, Portugal, the wind has a dynamic presence throughout the year, peaking during the chillier months. August records an average wind speed of 3.1 m/s (7 mph), marking a slight dip compared to the breezier summer months of May, June, and July, where winds hovered around 3.6 to 3.8 m/s. This gentle August breeze contrasts sharply with the refreshing winds of winter months like January and February, which see speeds climbing to 4.1 m/s (9 mph). Overall, while August provides a more subdued wind experience, it beautifully encapsulates the tranquil yet vibrant essence of summer by the coast, setting the stage for the transitioning seasons ahead.
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 August'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.
In August, Viana do Castelo experiences warm temperatures with an average of 20°C (67°F) and highs reaching up to 32°C (90°F), accompanied by relatively low precipitation of 30 mm over just three days. Humidity levels are moderate at 64%, making the summer feel pleasantly warm. In contrast, January sees much cooler conditions, with average temperatures dropping to 9°C (49°F) and lows reaching -1°C (31°F). This winter month is also much wetter, with 136 mm of precipitation spread over ten days and higher humidity at 87%. For more detailed information, check out Viana do Castelo weather in January.
When comparing the weather in August and February, a stark contrast emerges. August typically boasts warm temperatures, ranging from a minimum of 12°C (54°F) to a maximum of 32°C (90°F), with an average of 20°C (67°F) and relatively low precipitation of 30 mm (1.2 in) spread over just three days. In contrast, February is much cooler, with temperatures ranging from 1°C (35°F) to 21°C (70°F) and an average of 11°C (52°F). This month also sees significantly higher precipitation, totaling 185 mm (7.3 in) over 13 days, along with increased humidity at 81%. For more detailed insights, visit Viana do Castelo weather in February.
When comparing the weather in August and March, a distinct contrast emerges. August typically boasts warmer temperatures, with minimums around 12°C (54°F) and maximums reaching 32°C (90°F), making it a much more inviting month for outdoor activities. In contrast, March experiences cooler temperatures, ranging from a minimum of 2°C (37°F) to a maximum of 23°C (73°F). Furthermore, August sees relatively low precipitation at 30 mm (1.2 in) across just three days, while March is marked by significantly higher rainfall of 186 mm (7.3 in) over 13 days, contributing to a humidity level that averages 78%. For more detailed information on the climate during this time, you can check Viana do Castelo weather in March.
When comparing the weather in August and April, it's clear that August offers warmer temperatures, with an average of 20°C (67°F) and a maximum reaching 32°C (90°F). In contrast, April is considerably cooler, boasting an average temperature of just 13°C (56°F) and a maximum of 26°C (79°F). Additionally, April experiences significantly more rainfall, with 169 mm (6.7 in) over 13 days, while August sees only 30 mm (1.2 in) of precipitation across just 3 days. Humidity levels are also higher in April at 79%, compared to August's 64%. For a more detailed look at the weather patterns, check out Viana do Castelo weather in April.
When comparing the weather in August to that in May, notable differences emerge. August typically enjoys warmer temperatures, with averages around 20°C (67°F) and maximums reaching up to 32°C (90°F). In contrast, May experiences cooler temperatures, averaging 16°C (61°F) with maximums only climbing to 29°C (84°F). While August sees relatively low precipitation at 30 mm (1.2 in) over just 3 days, May is much wetter, receiving 106 mm (4.2 in) across 9 days. Additionally, humidity levels are higher in May at 78%, compared to 64% in August. For more detailed insights into May's weather, you can visit Viana do Castelo weather in May.
When comparing the weather in August and June, August tends to be warmer, with average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 32°C (90°F), while June has cooler temperatures, peaking at 28°C (84°F) and a minimum of 9°C (48°F). Additionally, August experiences less precipitation, with only 30 mm (1.2 in) over just 3 days, compared to June's 59 mm (2.3 in) spread across 7 days. Humidity levels are slightly lower in August at 64%, compared to June's 71%, making August feel relatively drier. For a closer look at the specific weather patterns, consider visiting Viana do Castelo weather in June.
In comparing the weather of August to July, we see that August experiences slightly warmer temperatures, with a minimum of 12°C (54°F) and a maximum of 32°C (90°F), compared to July's minimum of 11°C (53°F) and maximum of 30°C (87°F). Both months have an average temperature of 20°C (67°F). Precipitation is minimal in both months, though August has a bit more at 30 mm (1.2 in) over 3 days, while July records 26 mm (1.0 in) over 5 days. Humidity levels are comparable, with August at 64% and July at 63%. For further details on July weather, you can check out Viana do Castelo weather in July.
August typically brings warmer temperatures, with a minimum of 12°C and an average high of 32°C, while September cools down slightly, featuring a minimum of 10°C and a maximum of 30°C. In terms of precipitation, August sees 30 mm over just three days, whereas September experiences a notable increase with 49 mm spread over six days. Humidity rises from 64% in August to 71% in September, making the latter month feel a bit more oppressive despite the overall drop in temperature. For more detailed information, you can check the Viana do Castelo weather in September.
August weather is typically warmer and drier compared to October. With temperatures ranging from a cool 12°C (54°F) to a high of 32°C (90°F), August enjoys an average of 20°C (67°F) and only experiences about 30 mm (1.2 in) of precipitation over just three days. In contrast, October brings noticeably cooler temperatures, with a minimum of 6°C (43°F) and an average of 16°C (61°F), peaking at 29°C (84°F). Rain is much more prevalent in October, accumulating to 152 mm (6.0 in) across 11 days, and the humidity also rises to 79%. For more insights on the weather during this transitional month, check out Viana do Castelo weather in October.
In comparing the weather between August and November, it's evident that August enjoys warmer temperatures, with averages around 20°C (67°F) and maximums that can reach up to 32°C (90°F). In contrast, November experiences a significant drop, with average temperatures around 12°C (54°F) and maximums peaking at 21°C (70°F). Additionally, November is notably wetter, featuring 216 mm (8.5 in) of precipitation over 15 days, while August sees much less rain, with only 30 mm (1.2 in) across just 3 days. This increase in precipitation contributes to the higher humidity level of 86% in November compared to 64% in August. For more detailed insights into the weather patterns, you can explore Viana do Castelo weather in November.
August and December present starkly contrasting weather patterns. In August, temperatures range from a minimum of 12°C (54°F) to a maximum of 32°C (90°F), with an average of 20°C (67°F). The month is relatively dry, receiving only 30 mm (1.2 in) of precipitation over just three days, coupled with a humidity level of 64%. In contrast, December sees much cooler temperatures, with a minimum of 2°C (36°F) and a maximum of 19°C (66°F), averaging at 11°C (52°F). This month experiences significantly higher rainfall, totaling 246 mm (9.7 in) over 17 days, along with elevated humidity levels peaking at 87%. For a detailed look at December weather patterns, check out this link: Viana do Castelo weather in December.
In August, Viana do Castelo enjoys a warm and inviting climate that sets it apart from the rest of the year. With temperatures reaching up to 32°C (90°F), this vibrant month offers the perfect opportunity for outdoor activities and beach visits, contrasting sharply with the cooler and often more variable weather of spring and autumn. The average temperature hovers around 20°C (67°F), making it ideal for exploring the beautiful coastal scenery. While there is a modest 30 mm of precipitation over just a few days, the overall humidity of 64% ensures the air remains pleasant and refreshing. For more detailed information on the city's climate variations throughout the year, be sure to check out Viana do Castelo Climate.