September Weather in Portimao, Portugal

Last updated: February 24, 2025

Portimão, Portugal, in September offers a delightful blend of warmth and sunshine, with maximum temperatures peaking at a sizzling 37°C (98°F). Visitors can expect an average temperature of 22°C (73°F), providing a comfortable backdrop for outdoor activities. The month is mostly dry, receiving a mere 8 mm (0.3 in) of rain over just one day, creating an ideal setting for sunbathing and exploring the stunning Algarve coast. With humidity levels averaging around 71%, the air feels pleasantly warm, allowing for a perfect late-summer getaway. Whether you're lounging on the beach or tasting local cuisine, September in Portimão is sure to delight.

September Temperature in Portimao

In September, Portimao experiences a delightful transition as summer begins to wane. The temperatures are still quite warm, with lows averaging around 11°C (52°F), while the daily highs can reach up to 37°C (98°F), showcasing the tail end of the heat. On average, the month holds a pleasant 22°C (73°F), making it an ideal time for outdoor activities and lingering on the beautiful beaches. Compared to the scorching peaks of July and August, September offers a slightly more temperate climate, inviting visitors to enjoy the last rays of summer before autumn arrives. The trend of warm weather paired with cooling nights makes this month particularly appealing for those looking to soak up the sun in the stunning Algarve region.

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

The chart illustrates September temperature patterns in Portimao, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec505456596669737572665854
Data source: Temperature data for Portimao 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 Portimao

September in Portimão sees a subtle shift in precipitation patterns as the summer heat begins to wane. With only 8 mm (0.3 in) of rain falling across just 1 day, it marks a welcome respite after the remarkably dry months of July and August. This transitional month typically nudges the city back toward its wetter season, yet it retains a semblance of summer's charm. As the region prepares for the upcoming autumn, a slight uptick in rainfall awaits in October, promising a refreshing change while highlights the gradual return of humidity and occasional showers. Overall, September serves as a gentle bridge between the dry warmth of summer and the more generous precipitation that follows.

September Precipitation Trends in Portimao

The chart displays monthly precipitation patterns in Portimao, 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.
JanFebMarAprMayJunJulAugSepOctNovDec24447865238318325045
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portimao

As summer wanes, September in Portimão, Portugal, experiences a slight uptick in humidity, settling at a comfortable 71%. This marks a transition from the drier months of June and July, which saw humidity levels dip to around 67%. Following the consistently humid winter months, ranging from 80% in January to 81% in December, September offers a refreshing reprieve as the air retains just enough moisture for pleasant breezes, yet doesn't overwhelm visitors. Overall, the gradual fluctuation in humidity throughout the year reveals a Mediterranean climate that balances warmth with a touch of freshness, making Portimão a delightful destination as the summer fades into autumn.

September Average Humidity in Portimao

This chart illustrates the average monthly humidity levels in Portimao, 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.
JanFebMarAprMayJunJulAugSepOctNovDec80%74%71%69%69%67%69%68%71%75%78%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portimao

In September, Portimao experiences a UV Index of 9, placing it in the very high exposure category and requiring a burn time of just 15 minutes for those susceptible to sunburn. This marks a slight decrease from the extreme levels seen in the previous months, offering a brief respite before autumn sets in. Nonetheless, the sun remains strong, emphasizing the importance of sun protection as summer fades. As temperatures gradually drop, keeping an eye on the UV levels is essential for ensuring safe outdoor enjoyment. For more detailed insights, visit Portimao UV Index.

Maximum UV Index Levels in Portimao for September

The chart shows the monthly maximum UV Index (UVI) for Portimao 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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109743
Data source: Portimao 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 Portimao

As summer gracefully transitions into autumn, September in Portimão, Portugal continues to bask in an enviable glow with 351 hours of sunshine. This marks a notable decline from the sun-drenched heights of July, which boasts an impressive 425 hours, yet September still offers a warm embrace of daylight for both residents and visitors. Following a busy August, the sunshine starts to mellow, hinting at the gentle arrival of fall. However, with September’s abundant light, it remains a prime month for outdoor adventures and seaside relaxation, connecting the vibrant energy of summer with the calm beauty of autumn. As the year progresses, the gradual decrease in sunshine hours signals a changing season, but the allure of Portimão's sunny shores endures, inviting all to enjoy the lingering warmth of late summer.

Monthly Sunshine Duration in Portimao: September Highlighted

The September sunshine duration represents the total number of hours Portimao 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.
JanFebMarAprMayJunJulAugSepOctNovDec202h248h308h359h410h412h425h397h351h323h249h244h
Data source: Portimao September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Portimao During September

In Portimao, Portugal, September offers a delightful 65% chance of sunny weather, making it one of the more favorable months for sun-seekers. This month reflects a noticeable trend of increasing sunshine as the summer unfolds; during the peak of July, the likelihood soars to an impressive 87%, gradually tapering to 84% in August before settling in September. Following this warm streak, the chances of sunshine dip again in October, highlighting September as a prime time to enjoy the lingering summer vibes before autumn takes hold. With nearly two-thirds of the month basking in sunshine, it's an ideal period for both relaxation and exploration in this beautiful coastal town.

Percentage of Sunny Days in September in Portimao

The chart illustrates the percentage of sunny days in Portimao 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 Portimao experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec44%23%59%38%65%76%87%84%65%58%72%44%
Data source: Portimao September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Portimao in September

In September, Portimão enjoys a pleasant 12 hours of daylight, marking a gentle transition from the sun-drenched height of summer. After basking in up to 14 hours of daylight during the peak months of June, July, and August, the days begin to shorten, tapering off into the autumn. This gradual decrease echoes the patterns observed throughout the year, where the longest days occur in the summer, and the shortest are in the winter, with daylight duration fluctuating between 9 and 14 hours. As the sun sets a bit earlier, September invites a perfect balance of light, making it an ideal time for outdoor activities before the cooler months arrive.

Average Daylight Hours in Portimao for September

The chart illustrates the variation in daylight duration in Portimao throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 55m10h 49m11h 58m13h 9m14h 9m14h 39m14h 23m13h 30m12h 22m11h 11m10h 9m9h 38m
Data source: Portimao daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Portimao

As September arrives in Portimão, Portugal, the winds begin to shift, offering a gentle sigh at an average speed of 3.2 m/s (7 mph). This marks a subtle dip from the breezy highs of summer, where July reached 4.3 m/s (10 mph), creating an atmosphere that feels both refreshing and tranquil. The consistently mild winds of early fall signal the transition from the vibrant summer months to the more serene autumn days ahead. This ongoing breeze, just like in April and October, sets a perfect backdrop for enjoying the stunning coastline, inviting leisurely strolls and serene moments by the sea, while embodying the essence of the Mediterranean charm of Portimão.

Average September Wind Speed in Portimao

The chart displays monthly wind speed patterns in Portimao, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.53.93.43.24.13.94.33.73.2 m/s3.23.34.1
Data source: Portimao September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Portimao Compares to Other Months

The weather in Portimao 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 Portimao and find detailed weather information for every month.

In September, the weather is warm and pleasant, with average temperatures reaching around 22°C (73°F) and maximums soaring up to 37°C (98°F). This month typically sees only 8 mm (0.3 in) of precipitation over just one day, providing ample sunshine and a humidity level of 71%. In contrast, January brings a significant drop in temperatures, with an average of 10°C (51°F), peaking at around 21°C (70°F) while dipping to a chilly minimum of -2°C (29°F). This month experiences more precipitation at 24 mm (0.9 in) spread over three days, along with higher humidity levels of 80%. For a detailed look at January weather, you can visit Portimao weather in January.

September and February present markedly different weather conditions. In September, temperatures range from a minimum of 11°C (52°F) to a sweltering maximum of 37°C (98°F), yielding an average of 22°C (73°F). The month is relatively dry with only 8 mm (0.3 in) of precipitation over just one day, while humidity sits at 71%. In contrast, February features a cooler climate with temperatures fluctuating between 1°C (34°F) and 24°C (76°F), averaging 12°C (55°F). This month sees significantly more rainfall, totaling 44 mm (1.7 in) spread across five days, while humidity remains close at 73%. For further insights on February conditions in this region, you can check Portimao weather in February.

In September, the weather tends to be warmer and drier, with average temperatures ranging from a mild 11°C (52°F) at night to a scorching high of 37°C (98°F), while precipitation is quite low at only 8 mm (0.3 in) over just one day. In contrast, March experiences cooler temperatures, with lows of 3°C (38°F) and highs reaching 27°C (81°F). Additionally, this month is significantly wetter, with 78 mm (3.1 in) of rain spread over nine days. Both months share a humidity level of 71%, maintaining a similar feel in the air, but the overall weather experience is distinctly different. For more specific insights, you can check Portimao weather in March.

When comparing the weather in September and April, significant differences emerge. September enjoys warmer temperatures, with daily averages around 22°C (73°F) and maximums reaching up to 37°C (98°F). In contrast, April is cooler, with an average temperature of 15°C (60°F) and maximums of 29°C (84°F). Precipitation is notably lower in September, with only 8 mm (0.3 in) falling on just one day, while April experiences much more rainfall, totaling 65 mm (2.5 in) across 11 days. Humidity levels are similar in both months, around 71% in September and 69% in April. For a deeper insight into April's weather patterns, you can check Portimao weather in April.

In comparing the weather of September and May, we see notable differences in temperature and precipitation. September offers a warmer climate, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 37°C (98°F), while May is cooler, with temperatures ranging from 7°C (45°F) to a maximum of 34°C (93°F). Additionally, September is relatively dry, receiving only 8 mm (0.3 in) of precipitation on just one day, whereas May experiences more rainfall, totaling 23 mm (0.9 in) over four days. Humidity levels are quite similar, with September slightly higher at 71% compared to May's 69%. For a closer look at what to expect, check out the detailed insights here: Portimao weather in May.

In comparing the weather of September and June, both months experience a similar minimum temperature of 11°C (52°F) and a comparable level of precipitation, with each month receiving around 8 mm (0.3 in). However, September boasts a slightly higher average temperature of 22°C (73°F) compared to June's 21°C (69°F), while June can reach a peak of 40°C (105°F), slightly surpassing September's maximum of 37°C (98°F). Additionally, June has a higher number of rainy days, with precipitation occurring on three days compared to just one day in September, and the humidity is slightly lower in June at 67% compared to September's 71%. For more details, check out Portimao weather in June.

In comparing the weather of September and July, we can observe some notable similarities and differences. Both months experience warm temperatures, although September typically has a slightly lower average, at 22°C (73°F) compared to July's 23°C (74°F). The maximum temperatures are also less intense in September, peaking at 37°C (98°F) versus July's higher maximum of 39°C (103°F).

Precipitation levels are minimal in both months, with September receiving 8 mm over 1 day and July only 3 mm, also over 1 day, reflecting a trend of dry conditions. Humidity is slightly higher in September at 71%, compared to July's 69%. Overall, September offers a slightly cooler yet still warm climate, making it ideal for those who prefer moderate temperatures. For a closer look at the warm weather conditions in July, you can check Portimao weather in July.

In comparing the weather of September to that of August, September tends to offer slightly cooler temperatures, with a minimum of 11°C (52°F) and an average of 22°C (73°F), compared to August's minimum of 14°C (57°F) and average of 24°C (75°F). The maximum temperatures in September can reach up to 37°C (98°F), which is lower than August's peak of 43°C (110°F). Additionally, September experiences a bit more precipitation, receiving 8 mm (0.3 in) over a single day, while August sees virtually no rainfall at all, with just 1 mm recorded. Humidity levels are also slightly higher in September at 71%, compared to August's 68%. For more details, you can check Portimao weather in August.

In comparing the weather of September and October, we observe a notable shift in temperatures and precipitation. September typically enjoys warmer days with an average temperature of 22°C (73°F) and a maximum reaching up to 37°C (98°F), while October sees a decrease in temperatures, averaging 19°C (67°F) with a maximum of 34°C (93°F). The humidity also slightly increases from 71% in September to 75% in October. Additionally, October brings more precipitation, totaling 32 mm (1.2 in) over 4 days, in contrast to September's light rainfall of only 8 mm (0.3 in) on just 1 day. For a closer look at the climate specifics, you can visit Portimao weather in October.

September typically showcases warmer weather with average temperatures around 22°C (73°F) and a maximum of 37°C (98°F). It generally experiences low precipitation, only 8 mm (0.3 in) over a single day, making it a dry month with a humidity level of 71%. In contrast, November brings a notable drop in temperatures, with averages around 14°C (58°F) and maxima of 25°C (76°F). The month is significantly wetter, accumulating 49 mm (1.9 in) of rainfall over approximately seven days and featuring higher humidity at 78%. For more details, you can check Portimao weather in November.

September weather is characterized by warm temperatures, with averages around 22°C (73°F) and highs reaching up to 37°C (98°F). The month experiences relatively low precipitation, with only about 8 mm (0.3 in) falling over just one day, and humidity levels at 71%. In contrast, December brings cooler weather, with an average temperature of 12°C (54°F) and maximums of 22°C (71°F). It is also much wetter, with a total precipitation of 45 mm (1.8 in) spread across six days, and higher humidity levels at 81%. For a detailed look at December's climate, check out Portimao weather in December.

Compare Portimao's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Portimao

As summer transitions into autumn, September in Portimao offers a delightful blend of warm temperatures and low precipitation, making it a fantastic time to visit. While the maximum temperatures occasionally soar, the average warmth ensures pleasant days for outdoor activities. With only a brief day of rainfall, the generally dry weather coupled with high humidity levels creates a unique coastal ambiance that differs from the more intense summer heat. Whether you're lounging by the beach or exploring local culture, September's mild climate invites you to experience Portimao at its best. For more details on what to expect, check out Portimao Climate.