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September Weather in Ilhavo, Portugal

Last updated: August 27, 2025

In September, the average temperature in Ilhavo, Portugal hovers around 20°C (68°F). Expect a comfortable climate where minimum temperatures can dip to 11°C (53°F), while maximums may reach up to 31°C (88°F). However, be prepared for some rain, as the area typically receives 31 mm (1.2 in) of precipitation over 3 days, coupled with an average humidity level of 71%.

September Temperature in Ilhavo

In September in Ilhavo, the average temperature is 20°C (68°F). The maximum can reach 31°C (88°F), and the minimum can be as low as 11°C (53°F). This pleasant climate makes it an ideal destination for travelers seeking a comfortable and enjoyable experience.

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

The chart illustrates September temperature patterns in Ilhavo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ilhavo, September typically has an average temperature of 20°C (68°F), with highs reaching up to 31°C (88°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec515455586365686867635754
Data source: Temperature data for Ilhavo 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 Ilhavo

In Ilhavo in September, the precipitation amount is 31 mm (1.2 in) over the course of 3 days.

September Precipitation Trends in Ilhavo

The chart displays monthly precipitation patterns in Ilhavo, 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 Ilhavo, September typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec7098108106623212123193130133
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ilhavo

In Ilhavo in September, humidity is 71%. With an average temperature of 20°C (68°F), this humidity feels like a warm, moist embrace that can quickly lead to discomfort for travelers. The air clings to your skin, making even short walks feel more strenuous, while reaching for a refreshing drink becomes essential to stay hydrated.

September Average Humidity in Ilhavo

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

In Ilhavo 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 Ilhavo.

Maximum UV Index Levels in Ilhavo for September

The chart shows the monthly maximum UV Index (UVI) for Ilhavo 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 Ilhavo typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Ilhavo 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 Ilhavo Compares to Other Months

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

This table compares monthly weather conditions in Ilhavo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)70 mm (2.8 inches)87%moderate
February Weather12°C (54°F)98 mm (3.8 inches)81%moderate
March Weather13°C (56°F)108 mm (4.2 inches)78%high
April Weather15°C (58°F)106 mm (4.2 inches)79%very high
May Weather17°C (63°F)62 mm (2.4 inches)78%very high
June Weather18°C (65°F)32 mm (1.3 inches)71%very high
July Weather20°C (68°F)12 mm (0.5 inches)63%very high
August Weather20°C (68°F)12 mm (0.5 inches)64%very high
September Weather20°C (68°F)31 mm (1.2 inches)71%very high
October Weather17°C (63°F)92 mm (3.6 inches)79%high
November Weather14°C (57°F)130 mm (5.1 inches)86%moderate
December Weather12°C (54°F)133 mm (5.2 inches)87%low

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