September Weather in Sao Bartolomeu, Portugal

Last updated: February 24, 2025

Experience the charming September weather of São Bartolomeu, Portugal, where warm days greet you with a maximum temperature of 31°C (88°F) and a pleasant average of 19°C (67°F). As the summer warmth lingers, cooler nights drop to a minimum of 13°C (56°F), offering the ideal climate for evenings out. The month sees a modest precipitation amount of 27 mm (1.1 in) over just 3 days, ensuring that sunshine reigns most of the time despite a hint of humidity at 67%. This delightful weather will make your visit to São Bartolomeu both enjoyable and memorable!

September Temperature in Sao Bartolomeu

In September, São Bartolomeu, Portugal, welcomes the tail end of summer with temperatures that pleasantly linger in the warmth. As the season transitions, you can expect minimums around 13°C (56°F) and averages hovering around 19°C (67°F), making this a comfortable time for outdoor activities. The days can still reach a maximum of 31°C (88°F), reflecting the lingering heat of the summer months. As the month progresses, temperatures gently decline, setting the stage for the cooler autumn days ahead. This balance of warmth and moderate temperatures makes September an ideal time to explore the region's stunning landscapes and vibrant culture before the chill of fall arrives.

September Weather in Sao Bartolomeu: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Sao Bartolomeu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec525556586264676867645855
Data source: Temperature data for Sao Bartolomeu 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 Sao Bartolomeu

September in São Bartolomeu, Portugal, marks a subtle transition as the dry summer months yield to the early whispers of autumn. With a recorded precipitation of 27 mm (1.1 in) over three days, this month stands out as a slight increase from the notoriously dry August, which saw a mere 6 mm. Nonetheless, September's rainfall is still relatively modest compared to the wetter months that follow, such as October and November. This gradual uptick in precipitation signals the shifting seasons and is often welcomed, as it nourishes the landscape after the drier summer, setting the stage for a lush fall ahead. The trend of returning moisture hints at a more vibrant and rejuvenated environment, providing an inviting backdrop for early autumn activities.

September Precipitation Trends in Sao Bartolomeu

The chart displays monthly precipitation patterns in Sao Bartolomeu, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4554707939178627639071
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sao Bartolomeu

In September, Sao Bartolomeu experiences a noticeable shift in humidity levels as it transitions from the drier summer months. With a humidity of 67%, this month marks a slight increase from the consistent 60% seen in July and August, signaling the onset of autumn. Although September's humidity is still significantly lower than the high peaks of winter, reaching 85% in January and December, it does hint at the return of moisture in the air as the year progresses. The gradual decline in humidity from early in the year, peaking in the colder months, emphasizes a comfortable climate during September, making it a pleasant time to enjoy the region’s natural beauty without the heaviness of summer humidity.

September Average Humidity in Sao Bartolomeu

This chart illustrates the average monthly humidity levels in Sao Bartolomeu, 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 Sao Bartolomeu

As summer transitions into autumn, September in Sao Bartolomeu, Portugal continues to showcase a high UV Index, sitting at 8, which falls into the very high exposure category. With a burn time of just 15 minutes, it's crucial for residents and visitors to remain vigilant about sun protection as they enjoy the last warm days of the year. This month, while the UV intensity begins to decline from the peak levels of July and August, it still demands caution, reflecting a seasonal trend where UV exposure gradually decreases from the extreme highs seen in the summer months. For more information on the UV Index throughout the year, visit Sao Bartolomeu UV Index.

Maximum UV Index Levels in Sao Bartolomeu for September

The chart shows the monthly maximum UV Index (UVI) for Sao Bartolomeu 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: Sao Bartolomeu 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 Sao Bartolomeu

As the summer sun begins to wane, September in São Bartolomeu, Portugal, still basks in a generous 349 hours of sunshine, making it one of the brightest months of the year. This marks a slight decline from the peak summer months, with July boasting an impressive 420 hours of sun. However, compared to the colder days ahead, September's sunlight outshines both October's 312 hours and the more grayish months of November and December. This gradual transition from the height of summer to a milder autumn presents a perfect opportunity to enjoy the lingering warmth and vibrant scenery before winter sets in.

Monthly Sunshine Duration in Sao Bartolomeu: September Highlighted

The September sunshine duration represents the total number of hours Sao Bartolomeu 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.
JanFebMarAprMayJunJulAugSepOctNovDec181h228h306h352h408h409h420h395h349h312h232h218h
Data source: Sao Bartolomeu September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Sao Bartolomeu During September

September in São Bartolomeu, Portugal, boasts a 58% chance of sunny weather, making it a delightful month for those seeking warmth and light. As the summer sun begins to wane, this month experiences a notable decline in sun probability compared to the peak of August, which enjoys a sunny likelihood of 65%. However, September's outlook remains quite favorable, ensuring that visitors can still bask in pleasant sunny days. This trend reflects the tail end of the vibrant summer season, where the promise of sun lingers before the cooler months of autumn take hold.

Percentage of Sunny Days in September in Sao Bartolomeu

The chart illustrates the percentage of sunny days in Sao Bartolomeu 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 Sao Bartolomeu experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%23%58%36%50%57%64%65%58%52%64%37%
Data source: Sao Bartolomeu September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Sao Bartolomeu in September

In Sao Bartolomeu, Portugal, the transition into September marks a gradual shift as daylight begins to wane, offering 12 hours of sunlight—a slight decrease from the previous month. This trend reflects the region’s natural ebb and flow of daylight hours as summer gives way to fall. After enjoying the long, sun-soaked days of June, July, and August, which consistently boasted 14 hours of daylight, September signals a gentle decline that will continue into the shorter days of autumn. Following this pattern, October will see daylight further diminish to 11 hours, while November brings it down to 10 hours. This rhythm of daylight not only guides daily activities but also enhances the beauty of the changing seasons in this picturesque locale.

Average Daylight Hours in Sao Bartolomeu for September

The chart illustrates the variation in daylight duration in Sao Bartolomeu throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 44m10h 42m11h 58m13h 15m14h 20m14h 53m14h 35m13h 38m12h 24m11h 7m10h9h 25m
Data source: Sao Bartolomeu daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Sao Bartolomeu

September wind in São Bartolomeu, Portugal, ushers in a subtle decrease in breeze intensity, averaging 4.3 m/s (10 mph). This gentle air flow marks a transition from the summer months, as winds peak in July at 5.6 m/s (12 mph) before gradually fading into the cooler autumn season. Throughout these months, it's clear that summer winds maintain a reliable vigor, while September's softer currents invite a tranquil ambiance. As the year unfolds, we observe a trend of diminishing wind speeds heading into October, where it dips further to 3.9 m/s (9 mph), suggesting a calming shift in the coastal climate as the vibrant summer gives way to the mellow charm of fall.

Average September Wind Speed in Sao Bartolomeu

The chart displays monthly wind speed patterns in Sao Bartolomeu, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.05.34.43.55.45.45.64.94.3 m/s3.94.65.3
Data source: Sao Bartolomeu September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Sao Bartolomeu Compares to Other Months

The weather in Sao Bartolomeu 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 Sao Bartolomeu and find detailed weather information for every month.

In September, the weather is generally warmer with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 31°C (88°F) and an average of 19°C (67°F). The month experiences relatively low precipitation of 27 mm (1.1 in) over just 3 days, accompanied by moderate humidity levels at 67%. In contrast, January presents a cooler climate, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 19°C (67°F) and an average temperature of 11°C (53°F). This month also sees increased precipitation, totaling 45 mm (1.8 in) spread over 7 days, and higher humidity levels at 85%. For a more detailed look at January weather, you can explore Sao Bartolomeu weather in January.

When comparing the weather in September and February, September typically enjoys warmer temperatures, with an average of 19°C (67°F) and highs reaching up to 31°C (88°F). This month sees relatively low precipitation, with only about 27 mm (1.1 in) falling over roughly three days, contributing to a comfortable humidity of 67%. In contrast, February is cooler, with an average temperature of 13°C (55°F) and a maximum of 22°C (71°F). February experiences more rainfall, totaling approximately 54 mm (2.1 in) spread over eight days, accompanied by a higher humidity level of 75%. For more detailed insights, you can check the Sao Bartolomeu weather in February.

September and March present distinctly different weather patterns. In September, temperatures range from a minimum of 13°C (56°F) to a maximum of 31°C (88°F), boasting an average of 19°C (67°F). This month typically sees only 27 mm (1.1 in) of precipitation over about three days, with a humidity level of 67%. In contrast, March displays cooler conditions with minimum temperatures of 7°C (44°F) and maximums reaching 24°C (76°F), averaging around 13°C (56°F). This month experiences significantly more rainfall, totaling 69 mm (2.7 in) over nine days, and slightly higher humidity at 72%. For more details on March weather, you can visit Sao Bartolomeu weather in March.

When comparing the weather in September and April, notable differences emerge. September boasts warmer temperatures, with an average of 19°C (67°F) and a maximum reaching up to 31°C (88°F), making it feel quite summery. In contrast, April is cooler, with an average temperature of 14°C (58°F) and a maximum of 25°C (76°F). Additionally, April experiences significantly more rainfall, accumulating 79 mm (3.1 in) over 12 days, compared to September’s relatively dry 27 mm (1.1 in) over just 3 days. Humidity levels are similar, with April at 70% and September at 67%. For more information on the weather specifics in April, you can check Sao Bartolomeu weather in April.

In comparing the weather between September and May, we see some notable differences. September typically experiences slightly higher average temperatures, ranging from a minimum of 13°C (56°F) to a maximum of 31°C (88°F), with an average of 19°C (67°F). In contrast, May's temperatures are a bit cooler, with a minimum of 10°C (49°F) and an average of 17°C (63°F), while still reaching a maximum of 31°C (89°F). Precipitation is more prevalent in May, with 39 mm (1.5 in) falling over five days, compared to September's 27 mm (1.1 in) across just three days. Additionally, humidity levels are slightly higher in May at 70% compared to 67% in September. For more detailed weather insights specific to May, check out Sao Bartolomeu weather in May.

In comparing the weather of September and June, both months exhibit similar temperature ranges, with minimums around 13°C (55-56°F) and maximums peaking at 31°C (88°F). However, September has a slightly higher average temperature of 19°C (67°F) compared to June's average of 18°C (65°F). Precipitation levels also differ; September typically sees 27 mm (1.1 in) of rain over 3 days, while June has less, with only 17 mm (0.7 in) spread across 5 days. Additionally, humidity is slightly higher in September at 67%, compared to June's 63%. For more specifics about weather conditions in June, check out Sao Bartolomeu weather in June.

In comparing the weather between September and July, both months exhibit similar average temperatures of 19°C (67°F). However, July tends to be slightly warmer with a maximum of 32°C (90°F) compared to September’s peak of 31°C (88°F). July also experiences less precipitation, with only 8 mm (0.3 in) falling over just 1 day, while September sees more rainfall at 27 mm (1.1 in) across 3 days. Additionally, humidity levels are slightly lower in July at 60%, compared to 67% in September, indicating a more comfortable atmosphere during the earlier summer month. For more detailed information, you can check this link: Sao Bartolomeu weather in July.

In comparing the weather between August and September, we can see some notable differences. September typically experiences a slight decrease in temperature, with averages dropping from 20°C (68°F) in August to 19°C (67°F) in September. The maximum temperatures also reflect this trend, with September peaking at 31°C (88°F) compared to August’s 33°C (92°F). Additionally, September is a wetter month, recording 27 mm (1.1 in) of precipitation over three days, while August sees only 6 mm (0.2 in) over just one day. Humidity levels are slightly higher in September at 67%, compared to 60% in August. For more detailed information, you can check Sao Bartolomeu weather in August.

September and October display distinct differences in weather patterns. In September, temperatures range from a minimum of 13°C (56°F) to a maximum of 31°C (88°F), with an average of 19°C (67°F), and the month experiences relatively low precipitation of 27 mm (1.1 in) over just 3 days. In contrast, October sees a drop in minimum temperatures to 9°C (48°F) and a slight decrease in the average to 18°C (64°F), while the maximum remains fairly high at 30°C (86°F). However, October is noticeably wetter, with precipitation totaling 63 mm (2.5 in) spread over 6 days, contributing to a higher humidity level of 74%. For more details, check Sao Bartolomeu weather in October.

In September, the weather is typically warmer, with daily temperatures ranging from a minimum of 13°C (56°F) to a maximum of 31°C (88°F) and an average of 19°C (67°F). This month experiences relatively low precipitation, averaging only 27 mm (1.1 in) over about 3 days, along with a moderate humidity level of 67%. In contrast, November brings cooler temperatures, with lows around 8°C (46°F) and highs reaching 23°C (73°F), resulting in an average of 14°C (58°F). This month sees significantly more rainfall, totaling 90 mm (3.6 in) across approximately 13 days, plus a higher humidity level of 83%. For more details on November’s weather in the region, you can check Sao Bartolomeu weather in November.

In comparing the weather between September and December, notable differences emerge. September typically enjoys milder temperatures, with averages around 19°C (67°F) and a maximum that can reach up to 31°C (88°F), complemented by relatively low precipitation of 27 mm (1.1 in) over just three days. In contrast, December brings cooler temperatures, with averages dropping to 13°C (55°F) and highs reaching only 18°C (65°F). Additionally, December experiences higher precipitation levels at 71 mm (2.8 in) spread across ten days, along with increased humidity levels of 85%. For a detailed overview, you can visit Sao Bartolomeu weather in December.

Compare Sao Bartolomeu's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Sao Bartolomeu

As September rolls in, Sao Bartolomeu transitions into a season of warmth, offering a delightful mix of mild evenings and sunny days. Unlike the cooler months of winter, September boasts higher daytime temperatures, creating an inviting atmosphere ideal for exploration. While there's minimal rainfall—just a few days to note—the humidity levels maintain a pleasant balance, making outdoor activities more enjoyable. This month serves as a perfect bridge from summer's peak heat to the fresher autumn days ahead. For a deeper dive into the weather conditions throughout the year, check out Sao Bartolomeu Climate.