September weather forecast and climate
São Fiel, Portugal

Weather in September

September, the first month of the autumn, in São Fiel, is still a warm month, with average temperature ranging between max 28.5°C (83.3°F) and min 15.5°C (59.9°F).

Temperature

In September, the average high-temperature marginally drops, from a hot 32.8°C (91°F) in August, to a moderately hot 28.5°C (83.3°F). The average low-temperature, in September, is 15.5°C (59.9°F).

Heat index

The average heat index in September is evaluated at 28.9°C (84°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
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 a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, clothing, differences in body mass, height, and shape), 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. 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 São Fiel is 49%.

Rainfall

In São Fiel, during 5 rainfall days, 16mm (0.63") of precipitation is typically accumulated. Throughout the year, in São Fiel, there are 97 rainfall days, and 369mm (14.53") of precipitation is accumulated.

Snowfall

February through December are months without snowfall in São Fiel.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 9.5h.

UV index

In São Fiel, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 São Fiel?

The average high-temperature, in September, is 28.5°C (83.3°F), while the average low-temperature is 15.5°C (59.9°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that combines relative humidity and air temperature, in September is appraised at 28.9°C (84°F).

What is the average humidity in September in São Fiel?

The average relative humidity in September in São Fiel is 49%.

How many days does it rain in September in São Fiel?

In São Fiel, in September, it is raining for 5 days, with typically 16mm (0.63") of accumulated precipitation.

When it does not snow in São Fiel?

In São Fiel snow does not fall in February through December.

How many hours of daylight does São Fiel have in September?

In September, the average length of the day in São Fiel, Portugal, is 12.4h.

How long on average sun shines in September in São Fiel?

In September, the average sunshine in São Fiel, Portugal, is 9.5h.

What is the UV index reading in September in São Fiel?

In September, the average daily maximum UV index in São Fiel, Portugal, is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
São Fiel, Portugal

Average temperature in September - São Fiel, Portugal
  • Average high temperature in September: 28.5°C

The warmest month (with the highest average high temperature) is August (32.8°C).
The month with the lowest average high temperature is January (11.6°C).

  • Average low temperature in September: 15.5°C

The month with the highest average low temperature is July (17.2°C).
The coldest month (with the lowest average low temperature) is January (3.9°C).

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Average pressure in September
São Fiel, Portugal

Average pressure in September - São Fiel, Portugal
  • Average pressure in September: 1016.5mbar

The month with the highest atmospheric pressure is December (1023mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).

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Average wind speed in September
São Fiel, Portugal

Average wind speed in September - São Fiel, Portugal
  • Average wind speed in September: 8.3km/h

The windiest month (with the highest average wind speed) is February (11.3km/h).
The calmest month (with the lowest average wind speed) is September (8.3km/h).

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Average humidity in September
São Fiel, Portugal

Average humidity in September - São Fiel, Portugal
  • Average humidity in September: 49%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (44%).

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Average rainfall in September
São Fiel, Portugal

Average rainfall in September - São Fiel, Portugal
  • Average rainfall in September: 16mm

The wettest month (with the highest rainfall) is November (60mm).
The driest months (with the least rainfall) are July and August (3mm).

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Average rainfall days in September
São Fiel, Portugal

Average rainfall days in September - São Fiel, Portugal
  • Average rainfall days in September: 5 days

The month with the highest number of rainy days is November (12.3 days).
The month with the least rainy days is August (1.5 days).

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Average snowfall in September
São Fiel, Portugal

Average snowfall in September - São Fiel, Portugal
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (1mm).
Months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in September
São Fiel, Portugal

Average snowfall days in September - São Fiel, Portugal
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and March (0.1 days).
Months with the least snowfall days are February, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in September /
Average sunshine in September
São Fiel, Portugal

Average daylight in September / Average sunshine in September - São Fiel, 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: 9.5h

Months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 5.2h).

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Average sunshine days in September
São Fiel, Portugal

Average sunshine days in September - São Fiel, Portugal
  • Average sunshine days in September: 23.3 days

The month with the most sunshine days is August (28.3 days).
The month with the least sunshine days is April (16.6 days).

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Average UV index in September
São Fiel, Portugal

Average UV index in September - São Fiel, Portugal
  • Average UV index in September: 5

Months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
São Fiel, Portugal

Average cloud cover in September - São Fiel, Portugal
  • Average cloud cover in September: 16

The month with the most cloud cover is January (Cloud cover 42).
Months with the least cloud cover are July and August (Cloud cover 8).

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Average visibility in September
São Fiel, Portugal

Average visibility in September - São Fiel, Portugal
  • Average visibility in September: 10km

Months with the highest visibility are June, July, August and September (10km).
The month with the lowest visibility is January (8km).

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