September weather forecast
Quarteira, Portugal

In September, Quarteira experiences one last glimpse of the hot summer before transitioning into the cooler months of autumn. Temperatures start to decline from peak summer's highs. Compared to August, September sees a mild reintroduction of rain with 15mm (0.59") precipitation. Despite the slight drop in sea temperature, it remains warm enough for beachgoers. With the controlled heat and less crowd, it still serves as an inviting time for visitors to explore Quarteira.

Temperature

The onset of September manifests an average high-temperature of a still warm 27°C (80.6°F), demonstrating a minor variation from the preceding month. During the month of September, the temperature in Quarteira falls to an average of 17°C (62.6°F).

Rainfall

In Quarteira, in September, it is raining for 2 days, with typically 15mm (0.59") of accumulated precipitation. Throughout the year, in Quarteira, there are 77 rainfall days, and 557mm (21.93") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature in Quarteira is 21.4°C (70.5°F).
Note: Swimming is not enjoyable for most people in water that is 21.4°C (70.5°F). As the temperature descends from 21°C (69.8°F) to 15°C (59°F), breathing control becomes harder.

Daylight

In Quarteira, the average length of the day in September is 12h and 25min.
On the first day of September in Quarteira, sunrise is at 07:03 and sunset at 20:00. On the last day of the month, sunrise is at 07:27 and sunset at 19:17 WEST.

Sunshine

The average sunshine in September in Quarteira is 9h.

UV index

In Quarteira, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 7 suggests this advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Caution! The mirror effect of sand and water ups the UV radiation strength.