September weather forecast
Vila Franca de Xira, Portugal

The arrival of September indicates a subtle descent into cooler temperatures in Vila Franca de Xira. A sense of a receding summer is visible with temperatures falling between 15.8°C (60.4°F) and 28.2°C (82.8°F). However, the humidity level rises a tick to 65%. Rainfall becomes a more frequent occurrence with a significant 15mm (0.59") falling over approximately five days. Despite this, Vila Franca de Xira continues to enjoy abundant sunlight with 9.2 hours of daily sunshine. As September bows out, October steps in, marking the gradual onset of autumn.

Temperature

Vila Franca de Xira ushers in September with an average high-temperature of a warm 28.2°C (82.8°F), showing a close resemblance to the previous month. In the face of high daytime temperatures, Vila Franca de Xira witnesses a consistent average nighttime low of 15.8°C (60.4°F) during September.

Heat index

During September, the heat index is calculated to be a tropical 30°C (86°F). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.
Realize that the values for the heat index are set for shaded places and light winds. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in September in Vila Franca de Xira is 65%.

Rainfall

In Vila Franca de Xira, in September, it is raining for 5 days, with typically 15mm (0.59") of accumulated precipitation. In Vila Franca de Xira, during the entire year, the rain falls for 97 days and collects up to 309mm (12.17") of precipitation.

Sea temperature

With an average sea temperature of 20°C (68°F), September is the month with the warmest seawater in Vila Franca de Xira, Portugal.
Note: For most people, swimming in water at 20°C (68°F) is not a pleasurable experience. Breathing control gets harder as the water temperature descends from 21°C (69.8°F) to 15°C (59°F).

Daylight

In Vila Franca de Xira, the average length of the day in September is 12h and 26min.
On the first day of September in Vila Franca de Xira, sunrise is at 07:05 and sunset at 20:06. On the last day of the month, sunrise is at 07:31 and sunset at 19:20 WEST.

Sunshine

In September, the average sunshine is 9.2h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Vila Franca de Xira. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: A typical high UV index of 6 in September suggests the following recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.