September weather forecast and climate
Serra dos Clerigos, Portugal

Weather in September

The first month of the autumn, September, is still a tropical month in Serra dos Clerigos, Portugal, with temperature in the range of an average low of 15.8°C (60.4°F) and an average high of 30°C (86°F).

Temperature

In Serra dos Clerigos, the average high-temperature in September marginally drops, from 33.7°C (92.7°F) in August, to a still hot 30°C (86°F). In September, in Serra dos Clerigos, Portugal, the average low-temperature is 15.8°C (60.4°F).

Heat index

The average heat index is evaluated at 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 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, metabolic differences, clothing). 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 Serra dos Clerigos, the average relative humidity is 57%.

Rainfall

In Serra dos Clerigos, during September, the rain falls for 4.6 days and regularly aggregates up to 11mm (0.43") of precipitation. Throughout the year, in Serra dos Clerigos, Portugal, there are 107.1 rainfall days, and 346mm (13.62") of precipitation is accumulated.

Daylight

In Serra dos Clerigos, the average length of the day in September is 12.4h.

Sunshine

The average sunshine in September is 9.3h.

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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 Serra dos Clerigos?

The average high-temperature, in September, in Serra dos Clerigos, Portugal, is 30°C (86°F), while the average low-temperature is 15.8°C (60.4°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that takes the relative humidity and factores it into the air temperature reading, is appraised at 32.3°C (90.1°F).

What is the average humidity in September in Serra dos Clerigos?

In September, the average relative humidity in Serra dos Clerigos, Portugal, is 57%.

How much does it rain in Serra dos Clerigos in September?

In Serra dos Clerigos, Portugal, during September, the rain falls for 4.6 days and regularly aggregates up to 11mm (0.43") of precipitation.

How many hours of daylight does Serra dos Clerigos have in September?

In Serra dos Clerigos, the average length of the day in September is 12.4h.

How many hours of sunshine does Serra dos Clerigos have in September?

In Serra dos Clerigos, the average sunshine in September is 9.3h.

How high is the UV index in September in Serra dos Clerigos?

The average daily maximum UV index in September in Serra dos Clerigos, Portugal, is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Serra dos Clerigos, Portugal

Average temperature in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average pressure in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average wind speed in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average humidity in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average rainfall in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average rainfall days in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average daylight in September / Average sunshine in September - Serra dos Clerigos, Portugal
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
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
Serra dos Clerigos, Portugal

Average sunshine days in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average UV index in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average cloud cover in September - Serra dos Clerigos, 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
Serra dos Clerigos, Portugal

Average visibility in September - Serra dos Clerigos, 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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