September Weather in Carcavelos, Portugal

Last updated: February 24, 2025

In Carcavelos, Portugal, September ushers in a delightful transition from summer to autumn, with a maximum temperature reaching 29°C (84°F) and an inviting average of 20°C (68°F). Visitors can expect brisk yet pleasant evenings, as the minimum temperature dips to 14°C (58°F). Rainfall is minimal, with only 27 mm (1.1 in) recorded across just 2 days, allowing for ample sunshine and outdoor activities. With a humidity level of 67%, the atmosphere remains comfortably warm, making September an ideal month to explore this charming coastal town.

September Temperature in Carcavelos

In Carcavelos, September embraces the gentle transition from summer's heat to the crispness of autumn. With temperatures ranging from a mild 14°C (58°F) at night to a pleasant 29°C (84°F) during the day, the month offers comfortable weather perfect for enjoying the beach or exploring local attractions. The average low is a comfortable 20°C (68°F), indicating warm evenings ideal for outdoor dining or sunset strolls along the coastline. As the month progresses, temperatures gradually dip, hinting at the approaching fall, yet for now, September remains a delightful blend of warm sun and cooler evenings, making it an appealing time to visit this charming Portuguese destination.

September Weather in Carcavelos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Carcavelos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec535556586365686968655956
Data source: Temperature data for Carcavelos generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Carcavelos

In September, Carcavelos experiences a noticeable shift as summer wanes, bringing some light rainfall with a total precipitation of 27 mm (1.1 in) spread over just 2 days. This marks a trend of increasing moisture as the dry summer months, notably June to August, recorded minimal rainfall of only 11 mm, 5 mm, and 3 mm, respectively. The upcoming months signal a more significant uptick in precipitation, particularly in October, which typically sees 46 mm (1.8 in) over 5 days. This pattern highlights a transition from the heat of summer to a more balanced climate in fall, offering a refreshing reprieve to the arid conditions of previous months.

September Precipitation Trends in Carcavelos

The chart displays monthly precipitation patterns in Carcavelos, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec3753667336115327468062
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Carcavelos

In Carcavelos, Portugal, September marks a subtle transition in humidity, sitting at 67%. This month reflects a shift from the dry warmth of summer, where humidity stabilizes around 60% in July and August, to the slightly more humid conditions that will define the fall. As the year progresses, humidity levels begin to rise again, with notable peaks in the winter months, reaching 85% in January and December. This trend underscores the Mediterranean climate's characteristic seasonal shifts, where the warm summers gradually pave the way for the moisture-laden air of autumn and winter. The gradual increase in September serves as a gentle reminder that change is on the horizon, blending the lingering summer warmth with the promise of cooler, wetter months ahead.

September Average Humidity in Carcavelos

This chart illustrates the average monthly humidity levels in Carcavelos, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec85%75%72%70%70%63%60%60%68%74%83%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Carcavelos

As summer transitions into autumn, September in Carcavelos, Portugal still embraces high UV levels, with an UV Index of 8 that places it in the very high exposure category. While this marks a slight decline from the extremes of July and August, sun-seekers should remain cautious, as the potential for sunburn persists, with a burn time of just 15 minutes for unprotected skin. This trend highlights a pattern of UV intensity that peaks in the summer months, only to gradually lessen as the year progresses, dropping to a more moderate index by October. For those planning outdoor activities, it's essential to stay informed and take protective measures against UV exposure. For more details, please visit Carcavelos UV Index.

Maximum UV Index Levels in Carcavelos for September

The chart shows the monthly maximum UV Index (UVI) for Carcavelos in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Carcavelos September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Carcavelos

As summer transitions to autumn, September in Carcavelos, Portugal, continues to bask in abundant sunshine, offering an impressive 350 hours of daylight. This month captures the tail end of a sun-soaked season, following the peak brightness of July with 423 hours. While days may shorten, the warmth lingers, creating a perfect balance before cooler October descends with its 314 hours of sun. This gradual decline in sunlight hours hints at the changing seasons, yet September remains a vibrant and appealing time to experience the stunning coastal beauty of Carcavelos, where the golden hues of the sun linger just a little longer.

Monthly Sunshine Duration in Carcavelos: September Highlighted

The September sunshine duration represents the total number of hours Carcavelos experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec182h229h307h354h407h411h423h396h350h314h233h222h
Data source: Carcavelos September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Carcavelos During September

September in Carcavelos, Portugal, boasts a 63% chance of sunny weather, continuing the trend of late summer warmth that peaks in July and August. As the summer months transition into fall, the likelihood of sunshine remains notably high, indicating that this time of year is still ripe for outdoor activities and beach outings. Following the sunny streak of summer, September offers a pleasant blend of warmth, contributing to a comfortable climate with diminishing humidity. As the year progresses towards October, the chance of sunny days dips slightly, yet September stands out as a bright and inviting month to savor the remnants of summer in this charming coastal town.

Percentage of Sunny Days in September in Carcavelos

The chart illustrates the percentage of sunny days in Carcavelos throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Carcavelos experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%23%60%39%57%66%74%73%63%54%67%40%
Data source: Carcavelos September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Carcavelos in September

As summer fades into autumn in Carcavelos, Portugal, September marks a gentle transition in daylight duration, offering about 12 hours of sunshine. Following the peak of 14 hours in the summer months, the days start to shorten as the year progresses, showing the rhythm of nature's cycles. While this decrease is noticeable, it remains a stark contrast to the shorter daylight hours of winter, which dip to just 9 hours in December. The gradual shift from the vibrant 14 hours in July and August to September's 12 hours invites residents and visitors alike to savor the lingering warmth of summer while preparing for the cooler days ahead. This interplay of light not only enhances the beauty of the coastline but also signals the changing seasons, enriching the experience of life in this picturesque locale.

Average Daylight Hours in Carcavelos for September

The chart illustrates the variation in daylight duration in Carcavelos throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 47m10h 44m11h 58m13h 13m14h 17m14h 48m14h 31m13h 35m12h 23m11h 8m10h 3m9h 29m
Data source: Carcavelos daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Carcavelos

As summer fades into autumn, September in Carcavelos, Portugal brings a gentle transition in wind dynamics, showcasing an average wind speed of 4.2 m/s (9 mph). This marks a slight decrease from the peak summer winds of 5.7 m/s (13 mph) in July, setting a relaxing tone as golden beaches and scenic coastlines prepare for the quieter months ahead. Throughout the year, winds generally remain mild, peaking in the summer while consistently retreating towards the cooler months. With September's breezes refreshing the coastal air, it creates an idyllic environment for those looking to savor the beauty of Portugal before the hustle of autumn fully settles in.

Average September Wind Speed in Carcavelos

The chart displays monthly wind speed patterns in Carcavelos, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.95.14.33.65.55.55.75.24.2 m/s4.04.64.9
Data source: Carcavelos September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Carcavelos Compares to Other Months

The weather in Carcavelos changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Carcavelos and find detailed weather information for every month.

In September, the weather is generally warmer and more pleasant, with average temperatures ranging from a minimum of 14°C (58°F) to a maximum of 29°C (84°F). The month experiences relatively low precipitation, with only 27 mm (1.1 in) over about 2 days, and humidity levels around 67%, making it feel comfortable overall. In contrast, January brings cooler temperatures, with an average range of 3°C (38°F) to 19°C (66°F). This month sees increased precipitation, totaling 37 mm (1.5 in) spread across approximately 5 days, and higher humidity levels at 85%, contributing to a more damp and chilly atmosphere. For more detailed information, you can check Carcavelos weather in January.

September and February present quite contrasting weather conditions. In September, temperatures typically range from a minimum of 14°C (58°F) to a maximum of 29°C (84°F), with an average of 20°C (68°F), making it a warm and pleasant month. Precipitation is relatively low, with only 27 mm (1.1 in) over two days, and humidity averages around 67%. In contrast, February offers cooler temperatures, with a minimum of 5°C (41°F) and a maximum of 21°C (70°F), resulting in an average of 13°C (55°F). This month sees more rainfall, totaling 53 mm (2.1 in) over seven days, and higher humidity at 75%. For more detailed information, you can check Carcavelos weather in February.

The weather in September typically boasts warmer temperatures, with averages around 20°C (68°F) and highs reaching up to 29°C (84°F). In contrast, March experiences cooler temperatures, averaging 14°C (57°F) and peaking at 23°C (73°F). While September sees relatively low precipitation of 27 mm (1.1 in) over just 2 days, March is much wetter, with 66 mm (2.6 in) falling across 8 days. Humidity levels are slightly higher in March at 72%, compared to 67% in September. For more detailed information on March weather, you can check Carcavelos weather in March.

September and April exhibit distinct weather patterns, reflecting the transition between summer and autumn in September compared to the spring awakening in April. In September, temperatures range from a mild 14°C (58°F) to a warm 29°C (84°F), with an average of 20°C (68°F) and relatively low precipitation of 27 mm (1.1 in) over just 2 days. On the other hand, April experiences cooler temperatures, with a minimum of 8°C (46°F) and a maximum of 24°C (75°F), averaging at 15°C (59°F). Rainfall is more frequent in April, accumulating to 73 mm (2.9 in) over 12 days, alongside slightly higher humidity at 70%. For a deeper insight into the specific weather conditions of April, you can visit Carcavelos weather in April.

In September, the weather tends to be warmer with average temperatures around 20°C (68°F), peaking at a maximum of 29°C (84°F). The month typically sees minimal rainfall, with only 27 mm (1.1 in) spread over about 2 days and a humidity level of 67%. In contrast, May experiences slightly cooler temperatures, averaging 17°C (63°F) and reaching a maximum of 30°C (86°F). However, it tends to be wetter, with total precipitation of 36 mm (1.4 in) across 4 days and a higher humidity of 70%. For a closer look at the weather trends, you can check Carcavelos weather in May.

In comparing the weather of September and June, September tends to be slightly warmer with an average temperature of 20°C (68°F), peaking at 29°C (84°F), while June has a slightly cooler average of 18°C (66°F) and a maximum of 32°C (90°F). Precipitation in September is relatively low at 27 mm (1.1 in) over 2 days, compared to June's 11 mm (0.4 in) over 3 days, indicating that June has a more humid environment with a humidity level of 63% versus September's 67%. For more detailed insights into June weather, you can visit Carcavelos weather in June.

In comparing the weather of September and July, we find that September presents slightly cooler conditions, with a minimum temperature of 14°C (58°F) compared to July's 15°C (59°F). Both months share the same average temperature of 20°C (68°F), but July tends to be warmer overall, featuring a maximum of 31°C (87°F) versus September's 29°C (84°F). Precipitation in September is more significant, with about 27 mm (1.1 in) falling over two days, whereas July boasts a drier climate with only 5 mm (0.2 in) of rainfall throughout the month and no rainy days at all. Additionally, September experiences higher humidity at 67%, compared to July's 60%. For more detailed weather conditions in July, you can check Carcavelos weather in July.

In comparison to August, September experiences slightly cooler temperatures, with minimums dropping from 16°C (61°F) to 14°C (58°F) and maximums decreasing from a high of 35°C (95°F) to 29°C (84°F). While the average temperature remains relatively stable at around 20°C (68°F), September sees a higher level of humidity at 67% compared to August's 60%. Additionally, September has more precipitation, totaling 27 mm (1.1 in) across 2 days, whereas August typically remains dry with only 3 mm (0.1 in) over the entire month. For more details on August's weather, visit Carcavelos weather in August.

In September, the weather is generally warmer, with average temperatures around 20°C (68°F) and maximums reaching up to 29°C (84°F). This month experiences relatively low precipitation, only about 27 mm (1.1 in) over 2 days, and humidity levels sit at 67%. In contrast, October brings cooler temperatures, with averages dropping to 18°C (65°F) and minimums reaching 10°C (50°F). The rainfall increases significantly to 46 mm (1.8 in) spread over 5 days, and humidity rises to 74%. For more details on the weather conditions in October, visit Carcavelos weather in October.

September and November present distinctly different weather patterns. In September, temperatures range from a pleasant minimum of 14°C (58°F) to a warm maximum of 29°C (84°F), with a moderate average of 20°C (68°F). The month typically experiences only 27 mm (1.1 in) of precipitation over just 2 days, coupled with a humidity level of 67%, making it feel relatively comfortable.

In contrast, November brings cooler temperatures, with a minimum of 9°C (48°F) and a maximum of 23°C (73°F), resulting in an average of 15°C (59°F). This month sees significantly higher precipitation at 80 mm (3.2 in) over approximately 11 days, along with increased humidity at 83%. These changes make November feel much wetter and cooler compared to the warmth of September. For more details on November weather, you can check Carcavelos weather in November.

The weather in September is generally warmer and drier compared to December. In September, temperatures range from a minimum of 14°C (58°F) to a maximum of 29°C (84°F), with an average of around 20°C (68°F). The month sees only about 27 mm (1.1 in) of precipitation over just 2 days, with a moderate humidity level of 67%.

In contrast, December experiences cooler temperatures, with a minimum of 6°C (43°F) and a maximum of 18°C (65°F), averaging 13°C (56°F). This month is also considerably wetter, receiving 62 mm (2.4 in) of rainfall over 8 days, accompanied by higher humidity at 85%. For more details on the weather conditions in December, refer to Carcavelos weather in December.

Compare Carcavelos's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Carcavelos

As summer gives way to autumn, September in Carcavelos showcases a delightful transition in weather. With plenty of sunny days, the warmth lingers longer compared to the cooler months ahead, making it an ideal time for beachgoers and outdoor enthusiasts. The average temperature remains comfortably mild, while humidity levels provide a pleasant atmosphere without becoming oppressive. Interestingly, rainfall is minimal, with just a couple of rainy days throughout the month, allowing for ample opportunities to enjoy the outdoors. This gentle shift in climate sets the stage for a lovely autumn, as the scenery begins to transform. For a detailed dive into what the climate has to offer year-round, check out Carcavelos Climate.