September weather forecast and climate
Valhascos, Portugal

Weather in September

September, the first month of the autumn, in Valhascos, is also a moderately hot month, with average temperature ranging between min 15°C (59°F) and max 29.5°C (85.1°F).

Temperature

In September, the average high-temperature slightly decreases, from a hot 32.7°C (90.9°F) in August, to a warm 29.5°C (85.1°F). In Valhascos, in September, the average low-temperature is 15°C (59°F).

Heat index

In September, the average heat index is calculated to a tropical 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 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, differences in body mass, height, and shape, clothing, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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

The average relative humidity in September is 57%.

Rainfall

In September, in Valhascos, the rain falls for 4.3 days. Throughout September, 16mm (0.63") of precipitation is accumulated. Throughout the year, there are 85.1 rainfall days, and 280mm (11.02") of precipitation is accumulated.

Daylight

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

Sunshine

In September, the average sunshine in Valhascos is 9.2h.

UV index

May through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability 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. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Valhascos?

The average high-temperature, in September, is 29.5°C (85.1°F), while the average low-temperature is 15°C (59°F). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that takes the relative humidity and factores it into the air temperature reading, is evaluated at 31.4°C (88.5°F).

What is the average humidity in September in Valhascos?

In September, the average relative humidity in Valhascos, Portugal, is 57%.

How many days does it rain in September in Valhascos?

In September, the rain falls for 4.3 days. Throughout September, 16mm (0.63") of precipitation is accumulated.

How many hours of daylight does Valhascos have in September?

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

How long on average sun shines in September in Valhascos?

In September, the average sunshine in Valhascos is 9.2h.

What is the month with the highest UV index in Valhascos?

Months with the highest UV index in Valhascos are May through September, with an average maximum UV index of 6.

What is the UV index intensity in September in Valhascos?

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Valhascos, Portugal

Average temperature in September - Valhascos, 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
Valhascos, Portugal

Average pressure in September - Valhascos, 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
Valhascos, Portugal

Average wind speed in September - Valhascos, 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
Valhascos, Portugal

Average humidity in September - Valhascos, 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
Valhascos, Portugal

Average rainfall in September - Valhascos, 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
Valhascos, Portugal

Average rainfall days in September - Valhascos, 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
Valhascos, Portugal

Average daylight in September / Average sunshine in September - Valhascos, 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: 9.4h).

  • 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
Valhascos, Portugal

Average sunshine days in September - Valhascos, 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
Valhascos, Portugal

Average UV index in September - Valhascos, 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
Valhascos, Portugal

Average cloud cover in September - Valhascos, 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
Valhascos, Portugal

Average visibility in September - Valhascos, 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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