September weather forecast
Vila Franca de Xira, Portugal

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Weather in September

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.

Frequently asked questions

How hot is it in Vila Franca de Xira in September?

The high-temperature, in September, in Vila Franca de Xira, records 28.2°C (82.8°F), while the low-temperature is 15.8°C (60.4°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, is calculated to be 30°C (86°F).

What is the average humidity in September in Vila Franca de Xira?

The average relative humidity in September is 65%.

How much does it rain in Vila Franca de Xira in September?

In September, in Vila Franca de Xira, Portugal, the rain falls for 5 days. Throughout September, 15mm (0.59") of precipitation is accumulated.

What is the month with the warmest sea water in Vila Franca de Xira?

September is the month with the warmest seawater in Vila Franca de Xira, with an average sea temperature of 20°C (68°F).

How cold is the water in September in Vila Franca de Xira?

In September, the average sea temperature is 20°C (68°F). Swimming in 20°C (68°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Vila Franca de Xira have in September?

The average day length in September is 12h and 26min.

What time are sunrise and sunset in September in Vila Franca de Xira?

On the first day of September in Vila Franca de Xira, Portugal, 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.

How long on average sun shines in September in Vila Franca de Xira?

In Vila Franca de Xira, the average sunshine duration in September is 9.2h.

What are the months with the highest UV index in Vila Franca de Xira?

June through September, with an average maximum UV index of 6, are months with the highest UV index in Vila Franca de Xira.

What is the UV index reading in September in Vila Franca de Xira?

The average daily maximum UV index in September in Vila Franca de Xira is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.

Average temperature in September
Vila Franca de Xira, Portugal

Average temperature in September - Vila Franca de Xira, Portugal
  • Average high temperature in September: 28.2°C

The warmest month (with the highest average high temperature) is August (30.1°C).
The month with the lowest average high temperature is January (14.6°C).

  • Average low temperature in September: 15.8°C

The month with the highest average low temperature is July (16.5°C).
The coldest month (with the lowest average low temperature) is February (7.7°C).

Average pressure in September
Vila Franca de Xira, Portugal

Average pressure in September - Vila Franca de Xira, Portugal
  • Average pressure in September: 1016.9mbar

The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).

Average wind speed in September
Vila Franca de Xira, Portugal

Average wind speed in September - Vila Franca de Xira, Portugal
  • Average wind speed in September: 11.2km/h

The windiest month (with the highest average wind speed) is July (14.2km/h).
The calmest month (with the lowest average wind speed) is October (11km/h).

Average humidity in September
Vila Franca de Xira, Portugal

Average humidity in September - Vila Franca de Xira, Portugal
  • Average humidity in September: 65%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (64%).

Average rainfall in September
Vila Franca de Xira, Portugal

Average rainfall in September - Vila Franca de Xira, Portugal
  • Average rainfall in September: 15mm

The wettest month (with the highest rainfall) is November (56mm).
The driest month (with the least rainfall) is July (2mm).

Average rainfall days in September
Vila Franca de Xira, Portugal

Average rainfall days in September - Vila Franca de Xira, Portugal
  • Average rainfall days in September: 5 days

The month with the highest number of rainy days is April (12.8 days).
The month with the least rainy days is July (2.2 days).

Average sea temperature in September
Vila Franca de Xira, Portugal

Average sea temperature in September - Vila Franca de Xira, Portugal
  • Average sea temperature in September: 20°C

The best month for swimming (with the highest average sea temperature) is September (20°C).
The coldest month (with the lowest average sea temperature) is March (15.2°C).

Average daylight in September /
Average sunshine in September
Vila Franca de Xira, Portugal

Average daylight in September / Average sunshine in September - Vila Franca de Xira, Portugal
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).

Average sunshine days in September
Vila Franca de Xira, Portugal

Average sunshine days in September - Vila Franca de Xira, Portugal
  • Average sunshine days in September: 24.2 days

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is April (15.8 days).

Average UV index in September
Vila Franca de Xira, Portugal

Average UV index in September - Vila Franca de Xira, Portugal
  • Average UV index in September: 6

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, November and December (UV index 3).

Average cloud cover in September
Vila Franca de Xira, Portugal

Average cloud cover in September - Vila Franca de Xira, Portugal
  • Average cloud cover in September: 21

The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 18).

Average visibility in September
Vila Franca de Xira, Portugal

Average visibility in September - Vila Franca de Xira, Portugal
  • Average visibility in September: 9km

The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).

Vila Franca de Xira, Portugal

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