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September Weather in Serta, Portugal

Last updated: August 27, 2025

In September, the average temperature in Serta, Portugal is a pleasant 21°C (71°F). Expect a temperature range from a cool 9°C (49°F) to a warm 35°C (96°F). With an average humidity level of 67%, the air feels comfortable, though you might experience some precipitation, averaging 35 mm (1.4 in) over 4 days.

September Temperature in Serta

In September in Serta, the average temperature is 21°C (71°F), with maximums reaching up to 35°C (96°F) and minimums dipping as low as 9°C (49°F). Be sure to pack for warm afternoons while also preparing for cooler evenings during your travels.

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

The chart illustrates September temperature patterns in Serta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Serta, September typically has an average temperature of 21°C (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec475153576467737370635350
Data source: Temperature data for Serta 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 Serta

In Serta in September, the precipitation amount is 35 mm (1.4 in) over a span of 4 days.

September Precipitation Trends in Serta

The chart displays monthly precipitation patterns in Serta, 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. In Serta, September typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec52781211085021693575117102
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Serta

In Serta in September humidity is 67%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapping around you, making traveling both refreshing and a bit stifling at times, as the air clings to your skin and encourages slow, leisurely exploration.

September Average Humidity in Serta

This chart illustrates the average monthly humidity levels in Serta, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Serta is approximately 67%, offering insight into how humid the weather typically is during this month.
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 Serta

In Serta in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Serta.

Maximum UV Index Levels in Serta for September

The chart shows the monthly maximum UV Index (UVI) for Serta 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. In September, the maximum UV index in Serta typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689111098643
Data source: Serta 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.

How September Weather in Serta Compares to Other Months

Weather in Serta varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Serta, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Serta, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)52 mm (2.0 inches)85%moderate
February Weather10°C (51°F)78 mm (3.1 inches)75%moderate
March Weather12°C (53°F)121 mm (4.8 inches)72%high
April Weather14°C (57°F)108 mm (4.3 inches)70%very high
May Weather18°C (64°F)50 mm (1.9 inches)70%very high
June Weather20°C (68°F)21 mm (0.8 inches)63%extreme
July Weather23°C (73°F)6 mm (0.2 inches)60%very high
August Weather23°C (74°F)8 mm (0.3 inches)60%very high
September Weather21°C (71°F)35 mm (1.4 inches)67%very high
October Weather17°C (63°F)75 mm (2.9 inches)74%high
November Weather12°C (54°F)117 mm (4.6 inches)83%moderate
December Weather10°C (50°F)102 mm (4.0 inches)85%moderate

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