September weather forecast and climate
Vale das Porcas, Portugal

Weather in September

The first month of the autumn, September, is also a moderately hot month in Vale das Porcas, Portugal, with average temperature varying between 29.5°C (85.1°F) and 15°C (59°F).

Temperature

In September, the average high-temperature marginally drops, from a hot 32.7°C (90.9°F) in August, to a moderately hot 29.5°C (85.1°F). The average low-temperature, in September, is 15°C (59°F).

Heat index

In September, the average heat index is calculated to a hot 31.4°C (88.5°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, metabolic differences, pregnancy). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Vale das Porcas, the average relative humidity is 57%.

Rainfall

In Vale das Porcas, during September, the rain falls for 4.3 days and regularly aggregates up to 16mm (0.63") of precipitation. In Vale das Porcas, during the entire year, the rain falls for 85.1 days and collects up to 280mm (11.02") of precipitation.

Daylight

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

Sunshine

In September, the average sunshine is 9.2h.

UV index

Months with the highest UV index in Vale das Porcas are May through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 Porcas?

In September, the average high-temperature is 29.5°C (85.1°F), and the average low-temperature is 15°C (59°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that factores the actual air temperature with the relative humidity, is estimated at 31.4°C (88.5°F).

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

In Vale das Porcas, the average relative humidity in September is 57%.

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

In Vale das Porcas, Portugal, in September, it is raining for 4.3 days, with typically 16mm (0.63") of accumulated precipitation.

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

The average length of the day in September in Vale das Porcas, Portugal, is 12.4h.

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

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

What are the months with the highest UV index in Vale das Porcas?

Months with the highest UV index in Vale das Porcas, Portugal, are May through September, with an average maximum UV index of 6.

What is the UV index reading in September in Vale das Porcas?

In Vale das Porcas, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays.

Average temperature in September
Vale das Porcas, Portugal

Average temperature in September - Vale das Porcas, Portugal
  • Average high temperature in September: 29.5°C

The warmest month (with the highest average high temperature) is August (32.7°C).
The month with the lowest average high temperature is January (13.3°C).

  • Average low temperature in September: 15°C

The month with the highest average low temperature is August (15.7°C).
The coldest month (with the lowest average low temperature) is January (5.7°C).

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Average pressure in September
Vale das Porcas, Portugal

Average pressure in September - Vale das Porcas, Portugal
  • Average pressure in September: 1016.5mbar

The month with the highest atmospheric pressure is December (1022.8mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).

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Average wind speed in September
Vale das Porcas, Portugal

Average wind speed in September - Vale das Porcas, Portugal
  • Average wind speed in September: 9.8km/h

The windiest month (with the highest average wind speed) is February (12.6km/h).
The calmest month (with the lowest average wind speed) is September (9.8km/h).

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Average humidity in September
Vale das Porcas, Portugal

Average humidity in September - Vale das Porcas, Portugal
  • Average humidity in September: 57%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in September
Vale das Porcas, Portugal

Average rainfall in September - Vale das Porcas, Portugal
  • Average rainfall in September: 16mm

The wettest month (with the highest rainfall) is November (50mm).
The driest months (with the least rainfall) are July and August (3mm).

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Average rainfall days in September
Vale das Porcas, Portugal

Average rainfall days in September - Vale das Porcas, Portugal
  • Average rainfall days in September: 4.3 days

The month with the highest number of rainy days is November (11.2 days).
The month with the least rainy days is August (1.6 days).

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

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 11.6h).
The month with the least sunshine is January (Average sunshine: 5.1h).

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Average sunshine days in September
Vale das Porcas, Portugal

Average sunshine days in September - Vale das Porcas, Portugal
  • Average sunshine days in September: 25 days

Months with the most sunshine days are July and August (28.7 days).
The month with the least sunshine days is November (17.9 days).

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Average UV index in September
Vale das Porcas, Portugal

Average UV index in September - Vale das Porcas, Portugal
  • Average UV index in September: 6

Months with the highest UV index are May, June, July, August and September (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 Porcas, Portugal

Average cloud cover in September - Vale das Porcas, Portugal
  • Average cloud cover in September: 19

The month with the most cloud cover is January (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 12).

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Average visibility in September
Vale das Porcas, Portugal

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

The month with the highest visibility is June (10km).
The month with the lowest visibility is January (8km).

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