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September Weather in Alcains, Portugal

Last updated: August 27, 2025

In September, the average temperature in Alcains, Portugal hovers around 21°C (70°F), providing a pleasant climate. Expect temperatures to range from a cool 9°C (48°F) to a warm 35°C (95°F). With an average humidity of 67%, you might find it a bit muggy at times. Additionally, anticipate 36 mm (1.4 in) of precipitation over about 3 days, so don't forget your umbrella!

September Temperature in Alcains

In September in Alcains, the average temperature is 21°C (70°F), with maximums reaching 35°C (95°F) and minimums dipping as low as 9°C (48°F). This makes Alcains an ideal destination for travelers seeking mild weather with the chance to enjoy warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Alcains, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alcains, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec454952566369757570625248
Data source: Temperature data for Alcains 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 Alcains

In Alcains in September, the precipitation amount is 36 mm (1.4 in) over a period of 3 days.

September Precipitation Trends in Alcains

The chart displays monthly precipitation patterns in Alcains, 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 Alcains, September typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec486910997441856377310499
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alcains

In Alcains in September humidity is 67%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making travel a bit stifling but still enjoyable if you're prepared with light clothing and plenty of water.

September Average Humidity in Alcains

This chart illustrates the average monthly humidity levels in Alcains, 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 Alcains 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 Alcains

In Alcains 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 Alcains.

Maximum UV Index Levels in Alcains for September

The chart shows the monthly maximum UV Index (UVI) for Alcains 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 Alcains typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810111098643
Data source: Alcains 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 Alcains Compares to Other Months

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

This table compares monthly weather conditions in Alcains, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)48 mm (1.9 inches)85%moderate
February Weather10°C (50°F)69 mm (2.7 inches)75%moderate
March Weather11°C (52°F)109 mm (4.3 inches)72%high
April Weather13°C (56°F)97 mm (3.8 inches)70%very high
May Weather17°C (64°F)44 mm (1.7 inches)70%very high
June Weather20°C (69°F)18 mm (0.7 inches)63%extreme
July Weather24°C (75°F)5 mm (0.2 inches)60%very high
August Weather24°C (75°F)6 mm (0.2 inches)60%very high
September Weather21°C (70°F)36 mm (1.4 inches)67%very high
October Weather17°C (62°F)73 mm (2.9 inches)74%high
November Weather11°C (52°F)104 mm (4.1 inches)83%moderate
December Weather9°C (48°F)99 mm (3.9 inches)85%moderate

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