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September Weather in Fronteira, Portugal

Last updated: August 27, 2025

In September, the average temperature in Fronteira, Portugal is a pleasant 23°C (73°F). However, be prepared for a range of conditions, as temperatures can dip as low as 9°C (49°F) and soar up to 37°C (100°F). During this month, expect about 24 mm (0.9 in) of precipitation spread over roughly 3 days, with an average humidity level of 67%. Staying hydrated and dressed appropriately will make your visit much more enjoyable!

September Temperature in Fronteira

In September in Fronteira, the average temperature is 23°C (73°F). Maximum temperatures can reach 37°C (100°F), while minimum temperatures can drop to as low as 9°C (49°F). Thus, it's advisable to pack layers to accommodate the fluctuating temperatures during your travels.

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

The chart illustrates September temperature patterns in Fronteira, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fronteira, September typically has an average temperature of 23°C (73°F), with highs reaching up to 37°C (100°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec485355596670757673655552
Data source: Temperature data for Fronteira 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 Fronteira

In Fronteira in September, the precipitation amount is 24 mm (0.9 in) over a span of 3 days.

September Precipitation Trends in Fronteira

The chart displays monthly precipitation patterns in Fronteira, 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 Fronteira, September typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec3447827733134524436963
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fronteira

In Fronteira in September humidity is 67%. With an average temperature of 23°C (73°F), this humidity feels like a warm, enveloping blanket that makes the air feel thick and slightly sticky, which can be challenging for travelers who prefer cooler, drier conditions.

September Average Humidity in Fronteira

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

In Fronteira 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 Fronteira.

Maximum UV Index Levels in Fronteira for September

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

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

This table compares monthly weather conditions in Fronteira, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)34 mm (1.3 inches)85%moderate
February Weather11°C (53°F)47 mm (1.9 inches)75%moderate
March Weather13°C (55°F)82 mm (3.2 inches)72%high
April Weather15°C (59°F)77 mm (3.0 inches)70%very high
May Weather19°C (66°F)33 mm (1.3 inches)70%very high
June Weather21°C (70°F)13 mm (0.5 inches)63%extreme
July Weather24°C (75°F)4 mm (0.2 inches)60%very high
August Weather25°C (76°F)4 mm (0.2 inches)60%very high
September Weather23°C (73°F)24 mm (0.9 inches)67%very high
October Weather18°C (65°F)43 mm (1.7 inches)74%high
November Weather13°C (56°F)69 mm (2.7 inches)83%moderate
December Weather11°C (52°F)63 mm (2.5 inches)85%moderate

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