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September Weather in Seia, Portugal

Last updated: August 27, 2025

In September, the average temperature in Seia, Portugal hovers around 19°C (67°F). Expect a comfortable range, with minimum temperatures dipping to 6°C (44°F) and soaring up to a maximum of 33°C (92°F). During this month, you can anticipate approximately 43 mm (1.7 in) of precipitation spread over 5 days, alongside an average humidity level of 71%.

September Temperature in Seia

In September in Seia, the average temperature is 19°C (67°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 6°C (44°F). This weather makes it a perfect time for travel, offering warm days for exploration and cooler evenings for relaxation.

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

The chart illustrates September temperature patterns in Seia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seia, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec434850546064707066595046
Data source: Temperature data for Seia 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 Seia

In Seia in September, the precipitation amount is 43 mm (1.7 in) over the course of 5 days.

September Precipitation Trends in Seia

The chart displays monthly precipitation patterns in Seia, 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 Seia, September typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec68110133125563912174394132136
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seia

In Seia in September, humidity is 71%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel pleasant yet slightly sticky, as the air clings gently to your skin and invites you to stay hydrated while exploring.

September Average Humidity in Seia

This chart illustrates the average monthly humidity levels in Seia, 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 Seia is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%81%78%79%78%71%63%64%71%79%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seia

In Seia 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 Seia.

Maximum UV Index Levels in Seia for September

The chart shows the monthly maximum UV Index (UVI) for Seia 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 Seia typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346910111098643
Data source: Seia 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 Seia Compares to Other Months

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

This table compares monthly weather conditions in Seia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)68 mm (2.7 inches)87%moderate
February Weather9°C (48°F)110 mm (4.3 inches)81%moderate
March Weather10°C (50°F)133 mm (5.2 inches)78%high
April Weather12°C (54°F)125 mm (4.9 inches)79%very high
May Weather16°C (61°F)56 mm (2.2 inches)78%very high
June Weather18°C (65°F)39 mm (1.5 inches)71%extreme
July Weather21°C (70°F)12 mm (0.5 inches)63%very high
August Weather21°C (71°F)17 mm (0.7 inches)64%very high
September Weather19°C (67°F)43 mm (1.7 inches)71%very high
October Weather15°C (59°F)94 mm (3.7 inches)79%high
November Weather10°C (50°F)132 mm (5.2 inches)86%moderate
December Weather8°C (47°F)136 mm (5.4 inches)87%moderate

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