September weather forecast and climate
São Matias, Portugal

Weather in September

The first month of the autumn, September, is also a hot month in São Matias, Portugal, with temperature in the range of an average high of 30.7°C (87.3°F) and an average low of 17°C (62.6°F).

Temperature

In São Matias, the average high-temperature in September slightly decreases, from a hot 34.7°C (94.5°F) in August, to a still tropical 30.7°C (87.3°F). In São Matias, the average low-temperature is 17°C (62.6°F).

Heat index

In September, the average heat index is calculated to a hot 32.5°C (90.5°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, differences in body mass, height, and shape, clothing, and metabolic differences 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 São Matias is 52%.

Rainfall

In São Matias, during September, the rain falls for 3.3 days and regularly aggregates up to 5mm (0.2") of precipitation. In São Matias, Portugal, during the entire year, the rain falls for 65.2 days and collects up to 110mm (4.33") of precipitation.

Daylight

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

Sunshine

In São Matias, Portugal, the average sunshine in September is 9.4h.

UV index

The average daily maximum UV index in São Matias, Portugal, is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation 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. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
[Resources]

FAQ

What is the temperature in September in São Matias?

The average high-temperature, in September, in São Matias, is 30.7°C (87.3°F), while the average low-temperature is 17°C (62.6°F). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that takes the relative humidity and factores it into the air temperature reading, is calculated to 32.5°C (90.5°F).

What is the average humidity in September in São Matias?

In São Matias, the average relative humidity in September is 52%.

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

In São Matias, during September, the rain falls for 3.3 days and regularly aggregates up to 5mm (0.2") of precipitation.

What is the average length of the day in September in São Matias?

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

How many hours of sunshine does São Matias have in September?

The average sunshine in September is 9.4h.

How high is the UV index in September in São Matias?

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

Average temperature in September
São Matias, Portugal

Average temperature in September - São Matias, Portugal
  • Average high temperature in September: 30.7°C

The warmest month (with the highest average high temperature) is August (34.7°C).
The month with the lowest average high temperature is January (14.4°C).

  • Average low temperature in September: 17°C

The month with the highest average low temperature is August (17.8°C).
The coldest month (with the lowest average low temperature) is February (5.3°C).

[Resources]

Average pressure in September
São Matias, Portugal

Average pressure in September - São Matias, Portugal
  • Average pressure in September: 1016.4mbar

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

[Resources]

Average wind speed in September
São Matias, Portugal

Average wind speed in September - São Matias, Portugal
  • Average wind speed in September: 9.4km/h

The windiest month (with the highest average wind speed) is July (11.9km/h).
The calmest month (with the lowest average wind speed) is September (9.4km/h).

[Resources]

Average humidity in September
São Matias, Portugal

Average humidity in September - São Matias, Portugal
  • Average humidity in September: 52%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (47%).

[Resources]

Average rainfall in September
São Matias, Portugal

Average rainfall in September - São Matias, Portugal
  • Average rainfall in September: 5mm

The wettest month (with the highest rainfall) is April (20mm).
The driest months (with the least rainfall) are July and August (1mm).

[Resources]

Average rainfall days in September
São Matias, Portugal

Average rainfall days in September - São Matias, Portugal
  • Average rainfall days in September: 3.3 days

The month with the highest number of rainy days is April (9.7 days).
The month with the least rainy days is August (1 days).

[Resources]

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

Average daylight in September / Average sunshine in September - São Matias, 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: 9.4h

Months with the most sunshine are July and August (Average sunshine: 11.6h).
The month with the least sunshine is January (Average sunshine: 5.4h).

[Resources]

Average sunshine days in September
São Matias, Portugal

Average sunshine days in September - São Matias, Portugal
  • Average sunshine days in September: 25.1 days

The month with the most sunshine days is July (28.9 days).
The month with the least sunshine days is April (18.8 days).

[Resources]

Average UV index in September
São Matias, Portugal

Average UV index in September - São Matias, Portugal
  • Average UV index in September: 6

Months with the highest UV index are July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

[Resources]

Average cloud cover in September
São Matias, Portugal

Average cloud cover in September - São Matias, Portugal
  • Average cloud cover in September: 17

Months with the most cloud cover are January and April (Cloud cover 40).
Months with the least cloud cover are July and August (Cloud cover 10).

[Resources]

Average visibility in September
São Matias, Portugal

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

Months with the highest visibility are June, July, August and September (10km).
Months with the lowest visibility are January, February, March, April, May, October, November and December (9km).

[Resources]