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September Weather in Custoias, Portugal

Last updated: August 27, 2025

In Custoias, Portugal, the average temperature in September hovers around 19°C (67°F). Expect a temperature range with a minimum of 7°C (44°F) and a maximum soaring up to 34°C (93°F). The month brings about 31 mm (1.2 in) of precipitation spread across 4 days, contributing to an average humidity of 63%.

September Temperature in Custoias

In September in Custoias, the average temperature is 19°C (67°F). Maximums can reach 34°C (93°F) and minimums can be as low as 7°C (44°F). This climate offers a pleasant mix of warmth and cooler evenings, making it an ideal time for travelers to enjoy outdoor activities and explore the local attractions.

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

The chart illustrates September temperature patterns in Custoias, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Custoias, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec424750546267727266594946
Data source: Temperature data for Custoias 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 Custoias

In Custoias in September, the total precipitation amount is 31 mm (1.2 in) over a span of 4 days.

September Precipitation Trends in Custoias

The chart displays monthly precipitation patterns in Custoias, 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 Custoias, September typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec285964702933141031506570
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Custoias

In Custoias in September, humidity is 63%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace that adds a touch of heaviness to the air, making it slightly uncomfortable for traveling but still manageable with light clothing and plenty of hydration.

September Average Humidity in Custoias

This chart illustrates the average monthly humidity levels in Custoias, 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 Custoias is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%85%79%77%76%64%54%52%63%78%90%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Custoias

In Custoias 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 Custoias.

Maximum UV Index Levels in Custoias for September

The chart shows the monthly maximum UV Index (UVI) for Custoias 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 Custoias typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34699111098642
Data source: Custoias 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 Custoias Compares to Other Months

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

This table compares monthly weather conditions in Custoias, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)28 mm (1.1 inches)91%moderate
February Weather9°C (48°F)59 mm (2.3 inches)85%moderate
March Weather10°C (50°F)64 mm (2.5 inches)79%high
April Weather12°C (55°F)70 mm (2.7 inches)77%very high
May Weather17°C (62°F)29 mm (1.2 inches)76%very high
June Weather19°C (67°F)33 mm (1.3 inches)64%extreme
July Weather22°C (72°F)14 mm (0.6 inches)54%very high
August Weather22°C (72°F)10 mm (0.4 inches)52%very high
September Weather19°C (67°F)31 mm (1.2 inches)63%very high
October Weather15°C (59°F)50 mm (2.0 inches)78%high
November Weather10°C (50°F)65 mm (2.6 inches)90%moderate
December Weather8°C (46°F)70 mm (2.8 inches)91%low

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