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September Weather in Fortios, Portugal

Last updated: August 27, 2025

In September, the average temperature in Fortios, Portugal is a pleasant 22°C (73°F). Temperatures can range from a cool 10°C (49°F) to a scorching 37°C (99°F). Expect around 31 mm (1.2 in) of precipitation over approximately 4 days, accompanied by an average humidity level of 67%. Enjoy the diverse weather!

September Temperature in Fortios

In September in Fortios, the average temperature is 22°C (73°F). Maximums can reach 37°C (99°F), while minimums can drop as low as 10°C (49°F). Travelers should be prepared for warm days and cooler nights, making light layers essential for comfort.

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

The chart illustrates September temperature patterns in Fortios, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fortios, September typically has an average temperature of 22°C (73°F), with highs reaching up to 37°C (99°F) and lows dropping to around 10°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec475254576570757772645450
Data source: Temperature data for Fortios 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 Fortios

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

September Precipitation Trends in Fortios

The chart displays monthly precipitation patterns in Fortios, 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 Fortios, September typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec3752938741144731538075
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fortios

In Fortios in September, humidity is 67%. With an average temperature of 22°C (73°F), this humidity feels like a warm, damp blanket enveloping you, making outdoor activities slightly uncomfortable but still bearable for travelers who enjoy a tropical atmosphere.

September Average Humidity in Fortios

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

In Fortios 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 Fortios.

Maximum UV Index Levels in Fortios for September

The chart shows the monthly maximum UV Index (UVI) for Fortios 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 Fortios typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3469101110108643
Data source: Fortios 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 Fortios Compares to Other Months

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

This table compares monthly weather conditions in Fortios, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)37 mm (1.4 inches)85%moderate
February Weather11°C (52°F)51 mm (2.0 inches)75%moderate
March Weather12°C (54°F)93 mm (3.6 inches)72%high
April Weather14°C (58°F)87 mm (3.4 inches)70%very high
May Weather19°C (66°F)41 mm (1.6 inches)70%very high
June Weather21°C (70°F)14 mm (0.6 inches)63%extreme
July Weather24°C (76°F)4 mm (0.2 inches)60%very high
August Weather25°C (77°F)7 mm (0.3 inches)60%very high
September Weather22°C (73°F)31 mm (1.2 inches)67%very high
October Weather18°C (65°F)53 mm (2.1 inches)74%high
November Weather12°C (54°F)80 mm (3.2 inches)83%moderate
December Weather10°C (50°F)75 mm (3.0 inches)85%moderate

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