September weather forecast and climate
Vale das Velhas, Portugal

Weather in September

The first month of the autumn, September, is still a warm month in Vale das Velhas, Portugal, with average temperature fluctuating between 26.3°C (79.3°F) and 14.6°C (58.3°F).

Temperature

In September, the average high-temperature is practically the same as in August - a still moderately hot 26.3°C (79.3°F). In September, the average low-temperature is 14.6°C (58.3°F).

Humidity

August and September, with an average relative humidity of 68%, are the least humid months.

Rainfall

In September, in Vale das Velhas, the rain falls for 4.2 days. Throughout September, 8mm (0.31") of precipitation is accumulated. Throughout the year, there are 79 rainfall days, and 141mm (5.55") of precipitation is accumulated.

Daylight

In Vale das Velhas, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Vale das Velhas?

In Vale das Velhas, in September, the average high-temperature is 26.3°C (79.3°F), and the average low-temperature is 14.6°C (58.3°F).

What are the least humid months in Vale das Velhas?

Months with the lowest humidity in Vale das Velhas, Portugal, are August and September, with an average relative humidity of 68%.

What is the average humidity in September in Vale das Velhas?

In September, the average relative humidity in Vale das Velhas, Portugal, is 68%.

How many days does it rain in September in Vale das Velhas?

In Vale das Velhas, Portugal, in September, during 4.2 rainfall days, 8mm (0.31") of precipitation is typically accumulated.

How many hours of daylight does Vale das Velhas have in September?

In September, the average length of the day in Vale das Velhas is 12.4h.

How many hours of sunshine does Vale das Velhas have in September?

The average sunshine in September in Vale das Velhas is 9.2h.

How high is the UV index in September in Vale das Velhas?

The average daily maximum UV index in September in Vale das Velhas, Portugal, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Vale das Velhas, Portugal

Average temperature in September - Vale das Velhas, Portugal
  • Average high temperature in September: 26.3°C

The warmest month (with the highest average high temperature) is August (27.7°C).
The month with the lowest average high temperature is January (13.4°C).

  • Average low temperature in September: 14.6°C

The month with the highest average low temperature is July (15°C).
The coldest months (with the lowest average low temperature) are January and February (6.7°C).

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Average pressure in September
Vale das Velhas, Portugal

Average pressure in September - Vale das Velhas, Portugal
  • Average pressure in September: 1016.8mbar

The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).

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Average wind speed in September
Vale das Velhas, Portugal

Average wind speed in September - Vale das Velhas, Portugal
  • Average wind speed in September: 9.2km/h

The windiest month (with the highest average wind speed) is February (11.9km/h).
The calmest month (with the lowest average wind speed) is September (9.2km/h).

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Average humidity in September
Vale das Velhas, Portugal

Average humidity in September - Vale das Velhas, Portugal
  • Average humidity in September: 68%

The month with the highest relative humidity is January (82%).
Months with the lowest relative humidity are August and September (68%).

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Average rainfall in September
Vale das Velhas, Portugal

Average rainfall in September - Vale das Velhas, Portugal
  • Average rainfall in September: 8mm

The wettest month (with the highest rainfall) is November (27mm).
The driest month (with the least rainfall) is July (2mm).

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Average rainfall days in September
Vale das Velhas, Portugal

Average rainfall days in September - Vale das Velhas, Portugal
  • Average rainfall days in September: 4.2 days

The month with the highest number of rainy days is April (11.3 days).
The month with the least rainy days is August (1.9 days).

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Average daylight in September /
Average sunshine in September
Vale das Velhas, Portugal

Average daylight in September / Average sunshine in September - Vale das Velhas, Portugal
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 11.1h).
The month with the least sunshine is January (Average sunshine: 5.1h).

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Average sunshine days in September
Vale das Velhas, Portugal

Average sunshine days in September - Vale das Velhas, Portugal
  • Average sunshine days in September: 24.3 days

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is April (16.2 days).

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Average UV index in September
Vale das Velhas, Portugal

Average UV index in September - Vale das Velhas, Portugal
  • Average UV index in September: 5

The month with the highest UV index is August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Vale das Velhas, Portugal

Average cloud cover in September - Vale das Velhas, Portugal
  • Average cloud cover in September: 23

The month with the most cloud cover is January (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 22).

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Average visibility in September
Vale das Velhas, Portugal

Average visibility in September - Vale das Velhas, Portugal
  • Average visibility in September: 9km

Months with the highest visibility are January, February, March, April, May, June, September, October, November and December (9km).
Months with the lowest visibility are July and August (8km).

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