Last updated: February 24, 2025
September in Estoril, Portugal offers a delightful transition from summer to autumn, featuring a maximum temperature of 23°C (74°F) and an average of 18°C (65°F). With a minimum of 15°C (60°F), the climate remains pleasantly mild. Rainfall is minimal, averaging only 32 mm (1.2 in) across just 2 days, allowing ample opportunity to explore the scenic coastline and vibrant local culture. Humidity levels sit at a comfortable 67%, contributing to the region's overall pleasant atmosphere. Visitors can enjoy the blend of warmth and refreshing breezes that characterizes this charming seaside destination during the early fall.
In September, Estoril experiences a delightful transition as summer begins to gracefully shift into autumn. The temperatures range from a mild minimum of 15°C (60°F) to a comfortable average of 18°C (65°F), peaking at a pleasant 23°C (74°F). This month stands out with warm days perfect for enjoying the picturesque coastline while the evenings remain refreshingly cool. As compared to the sweltering heights of August, September offers a more temperate climate, making it an ideal time for travelers seeking a balance of sun and comfort. With decreasing humidity and plenty of sunny days, it’s a fantastic opportunity to explore the beautiful landscapes of this charming Portuguese coastal town.
In September, Estoril, Portugal experiences a modest precipitation total of 32 mm (1.2 in), marking a slight increase as the region transitions from summer to autumn. With only 2 rainy days, this month is relatively dry compared to the preceding summer months, where rainfall was minimal. This trend of low precipitation continues as the warmer months of July and August recorded just 3 mm and 4 mm, respectively. Looking forward, October typically ushers in a return to wetter conditions, with precipitation expected to rise significantly to 53 mm, setting the stage for a more temperate fall. Overall, September serves as a gentle bridge between the dry heat of summer and the approaching autumn rains, providing a pleasant respite before the seasonal shifts become more pronounced.
In September, humidity in Estoril, Portugal, hovers around 67%, marking a notable increase as it transitions from the drier summer months of July and August, when levels dip to a comfortable 60%. This slight rise signals the onset of autumn, where humidity begins its gradual climb back towards the higher levels seen in the colder months. Notably, the more humid conditions in September set the stage for the 83% and 85% humidity of November and December, respectively. As such, September serves as a gentle reminder of the shifting seasons, blending the lingering warmth of summer with the approaching chill of fall.
As September settles in Estoril, Portugal, the UV Index remains notably high at 8, accompanied by an exposure category of very high. With a burn time of just 15 minutes, sun seekers should be mindful of their time in the sun. While the UV Index starts to taper off from the extreme levels experienced in the peak summer months, it still commands attention for anyone enjoying the lingering warmth of early autumn. This trend underscores the importance of sun protection, as enthusiasts transition from the intense rays of July and August to the slightly less aggressive, yet still significant, September sun. For further details on UV Index levels and to stay informed about sun safety year-round, visit Estoril UV Index.
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As summer gently gives way to autumn in Estoril, September continues the delightful trend of abundant sunshine, boasting 348 hours of radiant light. This marks a slight decline from the peak of 420 hours in July, but still offers a splendid backdrop for outdoor activities and beach strolls. The month seamlessly bridges the sun-soaked days of summer, which culminate in August with 395 hours, leading to the softer glow of October's 313 hours. With a moderate decrease, September stands out as a brilliant time to enjoy the lingering warmth, making it a favorite for travelers seeking both relaxation and adventure under the Portuguese sun.
In September, Estoril, Portugal, enjoys a favorable 66% chance of sunny weather, making it one of the best months for sun-seekers. This figure aligns closely with the peak summer months of July and August, where the odds are similarly high at 69% and 66%, respectively. Notably, the summer months show a clear upward trend in sunshine chances, starting from a modest 45% in January and gradually climbing to its summer zenith. As autumn approaches, however, the likelihood of sunny days remains strong, with September holding on to the brightness of summer before the weather begins to cool in October. This trend highlights September as an ideal time to soak up the sun in Estoril, offering a perfect blend of warmth and pleasant conditions.
In Estoril, Portugal, September marks a gentle transition as the length of daylight begins to wane, offering around 12 hours of sunlight. This slight decline follows the peak summer months of June and July, which bask in 14 hours of daylight, showcasing the region's vibrant summer atmosphere. As we move into autumn, the shorter September days signal the gradual retreat of long, sun-drenched afternoons, reminiscent of the earlier spring months where daylight steadily increased from 9 hours in January to 11 hours by March. The month serves as a beautiful balance between the lingering warmth of summer and the cooler embrace of fall, inviting residents and visitors alike to savor the splendid scenery during the delightful daylight hours.
As summer transitions into autumn, September in Estoril experiences a gentle exhale, with wind speeds averaging a mild 5.4 m/s (12 mph). This marks a noticeable drop from the invigorating breezes of the preceding months, particularly August's 6.4 m/s (14 mph) and the robust gusts of May through July, which consistently hovered around 7.2 to 7.3 m/s (16 mph). The decline in wind speed reflects a calming rhythm, making September an ideal time for leisurely strolls along the coastline, where the soft winds whisper the promise of change. As the year progresses towards October, we see an even subtler shift, with wind speeds dipping slightly further to 5.1 m/s (11 mph), signaling the gentle embrace of autumn's approach in this stunning coastal paradise.
The weather in Estoril 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 Estoril and find detailed weather information for every month.
In September, temperatures are generally milder, with a minimum of 15°C (60°F) and a maximum of 23°C (74°F), averaging around 18°C (65°F). The month experiences relatively light precipitation, with only 32 mm (1.2 in) falling over just 2 days, and humidity levels at 67%. In contrast, January brings cooler weather, with minimum temperatures dropping to 7°C (45°F) and a maximum of 18°C (64°F), averaging 13°C (56°F). Precipitation increases to 42 mm (1.7 in), occurring on about 7 days, and humidity rises significantly to 85%. For more detailed insights on the weather in January, you can check Estoril weather in January.
September weather is generally warmer than February, with average temperatures ranging from a minimum of 15°C (60°F) to a maximum of 23°C (74°F). In contrast, February experiences cooler temperatures, with averages between 9°C (48°F) and 17°C (63°F). Furthermore, September sees relatively low precipitation levels of 32 mm (1.2 in) over just 2 days, while February is rainier, with 59 mm (2.3 in) spread over 8 days. Humidity also varies slightly, with September at 67% and February at a higher 75%. For more specific insights, check out Estoril weather in February.
In September, the weather tends to be warmer, with average temperatures ranging from a minimum of 15°C (60°F) to a maximum of 23°C (74°F). The month sees relatively low precipitation, amounting to 32 mm (1.2 in) over just 2 days, and a humidity level around 67%. In contrast, March features cooler conditions, with average temperatures from a minimum of 9°C (49°F) up to a maximum of 19°C (66°F). This month experiences more rainfall, totaling 64 mm (2.5 in) over 8 days, and a slightly higher humidity of 72%. For more specific details about the weather during March, you can check out Estoril weather in March.
When comparing the weather in September and April, we see distinct differences in temperature and precipitation patterns. September tends to be milder, with average temperatures reaching 18°C (65°F) and maximums peaking at 23°C (74°F), while April is cooler, with an average of 14°C (58°F) and a maximum of 21°C (71°F). Precipitation is more frequent in April, with 71 mm (2.8 in) falling over 11 days, compared to just 32 mm (1.2 in) over 2 days in September. Humidity levels are quite similar, standing at 67% in September and 70% in April. For a more detailed look at the April climate, you can visit Estoril weather in April.
In comparing the weather of September and May, we see some intriguing differences. September features a warmer minimum temperature of 15°C (60°F) and an average temperature of 18°C (65°F), while May starts with a cooler minimum of 11°C (53°F) and an average of 16°C (61°F). Notably, September has a slightly higher maximum temperature of 23°C (74°F), compared to May's peak of 24°C (76°F). Precipitation levels are similar, with September receiving about 32 mm (1.2 in) in 2 days and May slightly higher at 33 mm (1.3 in) over 3 days, indicating a comparable chance of rain. Humidity is also consistent, resting at 67% in September and 70% in May. For more specific information about May weather patterns, you can check Estoril weather in May.
In comparing the weather in September and June, September tends to be slightly warmer. The average temperature in September is 18°C (65°F), with a maximum of 23°C (74°F), while June has an average of 17°C (63°F) and a maximum of 22°C (72°F). Precipitation levels are also notably different; September sees 32 mm (1.2 in) of rain over two days, compared to just 12 mm (0.5 in) in June, also over two days. Additionally, September has a higher humidity level at 67%, compared to June's 63%. For more specific details about the weather in June, you can check Estoril weather in June.
When comparing the weather in September and July, September experiences slightly cooler temperatures, with a minimum of 15°C (60°F) and a maximum of 23°C (74°F), averaging around 18°C (65°F). In contrast, July has a minimum of 16°C (60°F) and a maximum of 21°C (70°F), with a similar average of 18°C (64°F). September also sees more precipitation, with 32 mm (1.2 in) over 2 days, whereas July is notably drier, recording only 3 mm (0.1 in) with no rainy days. Additionally, September has higher humidity at 67%, compared to July's 60%. For more detailed information, see Estoril weather in July.
In comparing the weather of September and August, we find that both months have similar average temperatures, with September experiencing a minimum of 15°C and a maximum of 23°C, just slightly cooler than August, which has a minimum of 16°C. However, September is characterized by increased precipitation, totaling 32 mm over 2 days, compared to the relatively dry August that sees only 4 mm of rain over a single day. Additionally, September's humidity is higher at 67%, while August boasts a lower humidity level of 60%. For more details about August weather specifically, you can check Estoril weather in August.
In September, the weather presents a mild climate with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 23°C (74°F), featuring an average temperature of 18°C (65°F). This month experiences relatively low precipitation, totaling 32 mm (1.2 in) over just 2 days, and maintains a humidity level of 67%.
Conversely, October brings slightly cooler mornings with a minimum temperature dropping to 11°C (52°F), while the average remains steady at 18°C (64°F) and the maximum temperature rises to 23°C (74°F). However, October experiences increased precipitation, totaling 53 mm (2.1 in) across 6 days, resulting in a higher humidity level of 74%. For more detailed insights on the October weather, refer to the link: Estoril weather in October.
In September, the weather is generally mild with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 23°C (74°F), averaging around 18°C (65°F). The month experiences relatively low precipitation, totaling 32 mm (1.2 in) over just 2 days, with a humidity level of 67%.
In contrast, November sees cooler temperatures, with minimums dropping to 11°C (53°F) and maximums reaching 20°C (68°F), averaging 16°C (60°F). This month also brings significantly more precipitation, totaling 89 mm (3.5 in) over 11 days, and higher humidity at 83%. For a more detailed understanding of the weather conditions, you can check out Estoril weather in November.
In September, the weather is relatively mild, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 23°C (74°F), while average humidity sits at 67%. The month experiences light rainfall, with only 32 mm (1.2 in) of precipitation over approximately 2 days. In contrast, December brings cooler temperatures, with a minimum of 9°C (49°F) and a maximum of just 17°C (63°F), resulting in an average temperature of 14°C (58°F). This month also sees a significant increase in rainfall, totaling 73 mm (2.9 in) across about 10 days, along with higher humidity levels at 85%. For more details on the December weather, you can check Estoril weather in December.
In September, Estoril ushers in a gentle transition towards autumn, featuring milder temperatures and reduced humidity compared to the peak summer months. With an average temperature around 18°C and pleasant highs of 23°C, this month strikes a balance between summer warmth and fall coolness. Notably, rainfall remains limited, averaging just 32 mm over about two days, making it a great time to enjoy outdoor activities without the oppressive heat. For a comprehensive overview of how September fits into the broader Estoril Climate, check out Estoril Climate.