Seixal Climate & Monthly Temperature Overview – Portugal

Spring and Autumn (March-May and September-November)

Spring and autumn in Seixal are characterized by mild and pleasant weather. Temperatures range from the mid-teens to low twenties Celsius, with plenty of sunshine and occasional showers. The average rainfall during these seasons is moderate, and the humidity is generally low. The blooming flowers and the changing colors of the leaves create a vibrant and picturesque landscape. This makes spring and autumn ideal for outdoor activities such as hiking, biking, and enjoying the beach.

Summer (June-August)

Summer in Seixal is hot and dry, with average temperatures reaching the mid-thirties Celsius. The humidity is also relatively high during this time, making the heat feel more intense. However, the occasional Atlantic breeze provides some relief. The sunshine hours are abundant, and the sky is often clear. While summer is a great time to enjoy the beach and outdoor activities, it is important to stay hydrated and take precautions against the heat by seeking shade and wearing sunscreen.

Summer Temperatures

Seixal, Portugal, experiences warm and sunny summers with average temperatures ranging from 20 to 27 degrees Celsius (68-81 degrees Fahrenheit). July and August are typically the hottest months, with average temperatures reaching 25-26 degrees Celsius (77-79 degrees Fahrenheit). During these months, the sun shines for an average of 10-12 hours per day, creating ideal conditions for outdoor activities and beach days. The humidity levels are generally moderate during the summer, making the weather comfortable overall.

Winter Temperatures

冬のセイクサル は穏やかで雨季が多いです. 平均気温は 10 ～ 13 度 (50 ～ 55 度) で、12 月が最も寒い月です。 この季節、雨が多く、月平均降水量は 7 ～ 10 cm です。 ただし、雨は一般的に短く、晴れた日と曇りの日が混在するため、冬の外出は可能です。 一部の年には雪が降ることもありますが、量は少なく、すぐに溶けます。

Types of Clouds in Seixal, Portugal

The skies above Seixal, Portugal, are adorned with a diverse array of cloud formations. During the hot and dry summer months, the most prevalent cloud type is the cumulus, characterized by its puffy and cauliflower-like appearance. These clouds typically form in the morning and dissipate as the day progresses. On days with higher humidity, the sky may be dotted with towering cumulonimbus clouds, which can produce thunderstorms and even hail.

During the winter months, the skies over Seixal become more overcast and dominated by stratus and nimbostratus clouds. These clouds blanket the sky in a dense, gray layer, often resulting in drizzle or light rain. In the late afternoon or early evening, the clouds may break up and reveal patches of blue sky, creating a beautiful interplay of light and shadow.

Monthly Precipitation

Seixal, Portugal, experiences a Mediterranean climate with hot, dry summers and mild, wet winters. The monthly precipitation pattern reflects this climate, with most rainfall occurring during the winter months. December is the wettest month, with an average of 103 mm (4.1 inches) of rain, followed by November with an average of 89 mm (3.5 inches). During the summer months, precipitation is scarce, with July and August receiving an average of only 1 mm (0.04 inches) of rain.

Annual Precipitation

The annual precipitation in Seixal averages around 546 mm (21.5 inches). This amount is relatively low compared to other parts of Portugal, which experience more rainfall due to their location on the Atlantic coast. The distribution of precipitation throughout the year is also important to consider. While the winter months receive the most rainfall, it is often intermittent and can vary in intensity. The summer months, on the other hand, are typically dry, with prolonged periods of no rainfall.

Rainfall Patterns in Seixal, Portugal

Rainfall in Seixal, Portugal, follows a distinct seasonal pattern characterized by a marked contrast between the wet and dry seasons. During the wet season, from October to April, Seixal experiences abundant rainfall, with monthly precipitation often exceeding 100 millimeters. The wettest months are typically December and January, which each receive an average of over 150 millimeters of rain. In contrast, the dry season, extending from May to September, is characterized by significantly reduced precipitation. July is the driest month, with an average rainfall of less than 10 millimeters.

Overall, Seixal’s annual precipitation is moderate, ranging between 600 and 800 millimeters, depending on the year. The rainfall is influenced by several factors, including the region’s proximity to the Atlantic Ocean, which provides moisture for rain-bearing clouds, and the topography of the surrounding area, which can affect wind patterns and cloud formation. The rainfall patterns in Seixal are important for agriculture, water resource management, and flood control in the region.

Snowfall in Seixal, Portugal: A Rare Occurrence

Seixal, Portugal, nestled along the southern bank of the Tagus River, is a city known for its temperate climate and picturesque coastline. However, on January 27, 2023, a remarkable snowfall blanketed the city, transforming its familiar streets into a winter wonderland. This rare meteorological event, the first snowfall in Seixal in over a century, brought a sense of wonder and delight to its residents.

For hours, a steady cascade of soft, white flakes descended from the sky, accumulating on rooftops, cars, and sidewalks. The city’s iconic suspension bridge, Ponte Vasco da Gama, became an ethereal silhouette against the snow-covered landscape. Children reveled in the wintry spectacle, building snowmen and engaging in snowball fights with abandon. Adults, too, shared in the magic, capturing the rare scene with their cameras and marveling at the beauty of their transformed city.

Climate of Seixal, Portugal

The city of Seixal, Portugal, enjoys a temperate climate, characterized by mild winters and warm summers. The average annual temperature is 15.8°C (60.4°F), with average highs in the summer months of July and August reaching 28°C (82.4°F) and average lows in the winter months of January and February dipping to 8°C (46.4°F). The city receives an average of 550mm (21.7in) of precipitation per year, with rainfall distributed relatively evenly throughout the year.

Sunshine in Seixal, Portugal

Seixal is renowned for its abundant sunshine, with an average of 2,800 hours of sunshine per year. The city experiences long, sunny days during the summer months, with an average of 10-12 hours of sunshine per day. Even during the winter months, Seixal enjoys an average of 5-7 hours of sunshine per day. The combination of mild temperatures and plentiful sunshine makes Seixal an ideal destination for outdoor activities and relaxation.

Moonrise and Moonset Times in Seixal, Portugal

The moon is an astronomical body that orbits the Earth, reflecting sunlight. Its position in the sky changes throughout the month as it orbits the Earth, and its appearance changes from a new moon to a full moon and back again.

In Seixal, Portugal, the moon rises and sets at different times each day. The moonrise time is the time at which the moon first appears above the horizon, and the moonset time is the time at which it disappears below the horizon. The times of moonrise and moonset vary throughout the month, depending on the phase of the moon and the location of Seixal on the Earth.

Moon Phases in Seixal, Portugal

The moon goes through a cycle of phases as it orbits the Earth. The moon’s appearance changes during the month, from a sliver to a full moon, and back again. In Seixal, Portugal, the moon can be seen in all of its phases, depending on the time of year and the time of night.

The new moon is the phase when the moon is not visible from Earth. It occurs when the moon is between the Earth and the sun. As the moon orbits the Earth, it moves away from the sun, and more of its illuminated side becomes visible. This is known as the waxing moon. When the moon is half illuminated, it is known as the first quarter moon. As the moon continues to move away from the sun, more of its illuminated side becomes visible. This is known as the waxing gibbous moon. When the moon is fully illuminated, it is known as the full moon. The full moon occurs when the moon is opposite the sun in the sky. After the full moon, the moon begins to move closer to the sun, and less of its illuminated side becomes visible. This is known as the waning moon. When the moon is half illuminated, it is known as the third quarter moon. As the moon continues to move closer to the sun, less of its illuminated side becomes visible. This is known as the waning crescent moon. The moon’s cycle begins again with the new moon.

Humidity in Seixal, Portugal

General Characteristics:

Seixal, a municipality in the Lisbon Metropolitan Area of Portugal, experiences a temperate oceanic climate influenced by its proximity to the Atlantic Ocean. Humidity levels in Seixal are generally high throughout the year, averaging around 75-80%. The high humidity results from the moist air masses originating from the ocean, which are carried inland by prevailing westerly winds.

Seasonal Variations:

Humidity levels in Seixal exhibit seasonal variations. During the summer months (June-September), humidity tends to be lower due to the influence of warmer and drier continental air masses. Average humidity levels during summer range from 65-70%. In contrast, during the winter months (November-March), humidity levels rise to their peak as the influence of the Atlantic Ocean intensifies. Average humidity levels in winter can reach up to 80-85%. The high humidity during winter can often lead to condensation and fog formation, creating a damp and misty atmosphere.

Wind Patterns

Seixal, Portugal is situated on the southern bank of the Tagus estuary, a location that significantly influences its wind patterns. The prevailing wind direction is from the northwest, bringing cool, moist air from the Atlantic Ocean. This wind often carries clouds and can result in sporadic rainfall. The intensity of the northwest wind tends to be moderate, but it can occasionally reach gale force during the winter months.

In addition to the prevailing wind, Seixal is also affected by the local topography. The Arrábida Mountains to the south shelter the area from the strong southerly winds that often affect the Portuguese coastline. However, when the wind does blow from the south, it can bring warm, dry air from the interior, leading to hot and sunny weather. The mountains also create a local wind phenomenon known as the “Nortada,” a cold, northerly wind that descends into Seixal from the higher elevations and can bring rain or snow in the winter.

Spring (April-June):

Spring is an excellent time to visit Seixal, Portugal, as the weather is pleasant and the crowds are smaller. Temperatures range from the mid-50s to the mid-60s Fahrenheit, making it ideal for exploring the city’s many attractions. During this time, you can enjoy the blooming flowers in the parks, walk along the scenic waterfront, and visit the historic landmarks without having to navigate large crowds. The beaches are also starting to open up, offering opportunities for sunbathing and swimming.

Autumn (September-November):

Autumn is another great time to visit Seixal. The weather remains mild, with average temperatures ranging from the mid-60s to the mid-70s Fahrenheit. This is a perfect time to explore the city’s cultural heritage by visiting museums, churches, and historic sites. You can also stroll through the charming streets, shop at the local markets, and sample the delicious cuisine. As the autumn foliage turns vibrant shades of red, orange, and yellow, you can also enjoy scenic walks or bike rides in the surrounding countryside.

Solar Energy Potential in Seixal

Seixal, Portugal, boasts an excellent solar energy potential due to its favorable geographical location. The city enjoys an average of over 3,000 sunshine hours annually, providing an abundant resource for solar energy production. With an average solar radiation intensity of approximately 1,800 kWh/m2 per year, Seixal is well-positioned to harness the sun’s energy. Moreover, the city’s relatively flat terrain and ample land area offer suitable locations for the establishment of large-scale solar farms.

Solar Energy Initiatives in Seixal

Recognizing the potential of solar energy, the municipality of Seixal has taken significant steps to promote its development. The city has implemented a “Solar Plan” aiming to increase the share of renewable energy in its energy mix. To this end, Seixal has launched several initiatives, including the installation of solar panels on municipal buildings and the provision of subsidies for solar photovoltaic systems for residential and commercial properties. Additionally, the city has established partnerships with energy companies to develop large-scale solar projects. These initiatives contribute to reducing the city’s carbon footprint, promoting energy independence, and creating new economic opportunities.

Geology and Geomorphology

Seixal, located in the Setúbal Peninsula, Portugal, exhibits a complex geological history. The region’s topography has been shaped by tectonic activity, erosion, and sedimentation. The underlying geology comprises predominantly Mesozoic and Cenozoic sedimentary rocks, including shale, limestone, and sandstone. These formations have undergone significant folding and faulting, resulting in the creation of hills, valleys, and plateaus. The area also features alluvial plains and terraces, formed by the deposition of sediments by the Tagus River.

Dunes and Beaches

Along the coastal region of Seixal, extensive sand dunes have accumulated due to wind-blown sediment deposition. These dunes form a protected natural habitat known as the Cavalo Branco Dune System, which supports diverse flora and fauna. The coastline is characterized by sandy beaches with gentle slopes, creating an inviting environment for recreation and tourism. The coastal area also features salt marshes and estuaries, contributing to the region’s ecological significance. Erosion and sediment transport processes have played a crucial role in shaping the topography and coastline of Seixal, influencing its geomorphological features.

Lisbon Airport (LIS)

Lisbon Airport, also known as Humberto Delgado Airport, is the nearest and most convenient airport to Seixal, Portugal. It is located approximately 15 kilometers (9 miles) north of Seixal and serves as the main international gateway to the Lisbon metropolitan area. Lisbon Airport offers direct flights to numerous destinations in Europe, North America, South America, Africa, and Asia, making it easily accessible from both domestic and international locations. The airport features two terminals, Terminal 1 and Terminal 2, which are connected by a free shuttle bus. Terminal 1 primarily handles domestic and short-haul flights, while Terminal 2 is dedicated to long-haul international flights.

Getting from Lisbon Airport to Seixal

To get from Lisbon Airport to Seixal, several transportation options are available, including taxis, buses, and the metro. Taxis are readily available outside the airport terminals and offer a direct and convenient way to reach Seixal, with fares typically ranging between 20 and 30 euros. Alternatively, there are regular bus services (Aerobus) that connect Lisbon Airport to the city center and surrounding areas, including Seixal. The bus stop is located outside Terminal 1, and the journey takes approximately 45 minutes. Additionally, the metro’s Red Line (Linha Vermelha) runs from the airport to the city center, with a stop at Seixal. The metro station is located in Terminal 1, and the journey takes around 30 minutes.

History and Culture

Seixal, a municipality in the Lisbon metropolitan area, holds a rich historical and cultural tapestry. Its origins date back to Roman times, and during the Middle Ages, it was a strategic location for trade and defense. The town’s emblem bears a Roman vessel, symbolizing its maritime origins. Throughout history, Seixal played a significant role in the Portuguese fishing industry. Today, it continues to be a popular destination for tourists and locals alike, offering a blend of historical charm and modern amenities.

Economy and Demographics

Seixal’s economy is primarily based on industry, with a focus on shipbuilding, metalworking, and textiles. It is home to the largest industrial complex in the Setúbal Peninsula, the Parque Industrial do Seixal, which plays a crucial role in the region’s economy. The municipality is also a major population center, with a population of over 180,000 people. The majority of the population works in the industrial and service sectors. Seixal’s proximity to Lisbon and the presence of modern infrastructure make it an attractive location for businesses and residents.