September weather forecast and climate
Vale da Vaca, Portugal

Weather in September

The first month of the autumn, September, is still a hot month in Vale da Vaca, Portugal, with average temperature varying between 30°C (86°F) and 15.8°C (60.4°F).

Temperature

In September, the average high-temperature marginally drops, from 33.7°C (92.7°F) in August, to a still tropical 30°C (86°F). In Vale da Vaca, in September, the average low-temperature is 15.8°C (60.4°F).

Heat index

The average heat index is calculated to a hot 32.3°C (90.1°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, clothing, pregnancy), and activity. 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 especially crucial 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 is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Vale da Vaca, the average relative humidity is 57%.

Rainfall

In September, the rain falls for 4.6 days. Throughout September, 11mm (0.43") of precipitation is accumulated. Throughout the year, there are 107.1 rainfall days, and 346mm (13.62") of precipitation is accumulated.

Daylight

In Vale da Vaca, Portugal, the average length of the day in September is 12.4h.

Sunshine

In Vale da Vaca, Portugal, the average sunshine is 9.3h.

UV index

The average daily maximum UV index in Vale da Vaca is 6. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Vale da Vaca?

The average high-temperature, in September, in Vale da Vaca, is 30°C (86°F), while the average low-temperature is 15.8°C (60.4°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), that takes the relative humidity and factores it into the air temperature reading, in September is evaluated at 32.3°C (90.1°F).

What is the average humidity in September in Vale da Vaca?

In September, the average relative humidity in Vale da Vaca is 57%.

How much does it rain in Vale da Vaca in September?

In Vale da Vaca, during September, the rain falls for 4.6 days and regularly aggregates up to 11mm (0.43") of precipitation.

What is the average length of the day in September in Vale da Vaca?

The average length of the day in September in Vale da Vaca is 12.4h.

How many hours of sunshine does Vale da Vaca have in September?

The average sunshine in September is 9.3h.

How high is the UV index in September in Vale da Vaca?

In September, the average daily maximum UV index in Vale da Vaca, Portugal, is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Vale da Vaca, Portugal

Average temperature in September - Vale da Vaca, Portugal
  • Average high temperature in September: 30°C

The warmest month (with the highest average high temperature) is August (33.7°C).
The month with the lowest average high temperature is January (14°C).

  • Average low temperature in September: 15.8°C

Months with the highest average low temperature are July and August (16.1°C).
The coldest month (with the lowest average low temperature) is February (5.8°C).

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Average pressure in September
Vale da Vaca, Portugal

Average pressure in September - Vale da Vaca, Portugal
  • Average pressure in September: 1016.5mbar

The month with the highest atmospheric pressure is December (1022.7mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).

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Average wind speed in September
Vale da Vaca, Portugal

Average wind speed in September - Vale da Vaca, Portugal
  • Average wind speed in September: 9.3km/h

The windiest month (with the highest average wind speed) is March (11.5km/h).
The calmest month (with the lowest average wind speed) is September (9.3km/h).

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Average humidity in September
Vale da Vaca, Portugal

Average humidity in September - Vale da Vaca, Portugal
  • Average humidity in September: 57%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (54%).

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Average rainfall in September
Vale da Vaca, Portugal

Average rainfall in September - Vale da Vaca, Portugal
  • Average rainfall in September: 11mm

The wettest month (with the highest rainfall) is April (53mm).
The driest months (with the least rainfall) are July and August (1mm).

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Average rainfall days in September
Vale da Vaca, Portugal

Average rainfall days in September - Vale da Vaca, Portugal
  • Average rainfall days in September: 4.6 days

Months with the highest number of rainy days are March and April (14.9 days).
The month with the least rainy days is August (1.3 days).

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Average daylight in September /
Average sunshine in September
Vale da Vaca, Portugal

Average daylight in September / Average sunshine in September - Vale da Vaca, 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: 9.3h

The month with the most sunshine is July (Average sunshine: 11.5h).
The month with the least sunshine is January (Average sunshine: 5.3h).

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Average sunshine days in September
Vale da Vaca, Portugal

Average sunshine days in September - Vale da Vaca, Portugal
  • Average sunshine days in September: 24 days

The month with the most sunshine days is July (29.3 days).
The month with the least sunshine days is April (13.4 days).

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Average UV index in September
Vale da Vaca, Portugal

Average UV index in September - Vale da Vaca, Portugal
  • Average UV index in September: 6

The month with the highest UV index is August (UV index 7).
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 da Vaca, Portugal

Average cloud cover in September - Vale da Vaca, Portugal
  • Average cloud cover in September: 19

The month with the most cloud cover is January (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 12).

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Average visibility in September
Vale da Vaca, Portugal

Average visibility in September - Vale da Vaca, Portugal
  • Average visibility in September: 9km

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

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