September weather forecast and climate
Seda, Portugal

Weather in September

September, the first month of the autumn, in Seda, is also a moderately hot month, with average temperature fluctuating between 16.3°C (61.3°F) and 29.3°C (84.7°F).

Temperature

In Seda, Portugal, the average high-temperature slightly decreases, from a tropical 33.3°C (91.9°F) in August, to a warm 29.3°C (84.7°F). In September, in Seda, the average low-temperature is 16.3°C (61.3°F).

Heat index

The average heat index is estimated at 29.8°C (85.6°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 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, wind, metabolic differences, and clothing 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 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 is 48%.

Rainfall

In Seda, Portugal, in September, during 5.1 rainfall days, 9mm (0.35") of precipitation is typically accumulated. Throughout the year, in Seda, there are 79 rainfall days, and 220mm (8.66") of precipitation is accumulated.

Snowfall

April through December are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine in Seda is 9.4h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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 Seda?

The average high-temperature, in September, in Seda, Portugal, is 29.3°C (84.7°F), while the average low-temperature is 16.3°C (61.3°F). 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, in September is evaluated at 29.8°C (85.6°F).

What is the average humidity in September in Seda?

In September, the average relative humidity in Seda is 48%.

How many days does it rain in September in Seda?

In September, the rain falls for 5.1 days. Throughout September, 9mm (0.35") of precipitation is accumulated.

When it does not snow in Seda?

In Seda, Portugal, snow does not fall in April through December.

What is the average length of the day in September in Seda?

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

How long on average sun shines in September in Seda?

The average sunshine in September in Seda is 9.4h.

What is the UV index intensity in September in Seda?

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

Average temperature in September
Seda, Portugal

Average temperature in September - Seda, Portugal
  • Average high temperature in September: 29.3°C

The warmest month (with the highest average high temperature) is August (33.3°C).
The month with the lowest average high temperature is January (11.9°C).

  • Average low temperature in September: 16.3°C

The month with the highest average low temperature is August (17.7°C).
The coldest month (with the lowest average low temperature) is January (4.2°C).

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Average pressure in September
Seda, Portugal

Average pressure in September - Seda, Portugal
  • Average pressure in September: 1016.3mbar

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
Seda, Portugal

Average wind speed in September - Seda, Portugal
  • Average wind speed in September: 8.4km/h

The windiest month (with the highest average wind speed) is February (12.1km/h).
The calmest month (with the lowest average wind speed) is September (8.4km/h).

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Average humidity in September
Seda, Portugal

Average humidity in September - Seda, Portugal
  • Average humidity in September: 48%

The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in September
Seda, Portugal

Average rainfall in September - Seda, Portugal
  • Average rainfall in September: 9mm

The wettest month (with the highest rainfall) is November (39mm).
The driest month (with the least rainfall) is July (3mm).

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Average rainfall days in September
Seda, Portugal

Average rainfall days in September - Seda, Portugal
  • Average rainfall days in September: 5.1 days

The month with the highest number of rainy days is April (11.7 days).
The month with the least rainy days is July (1.7 days).

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Average snowfall in September
Seda, Portugal

Average snowfall in September - Seda, Portugal
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (5mm).
Months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in September
Seda, Portugal

Average snowfall days in September - Seda, Portugal
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.4 days).
Months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in September /
Average sunshine in September
Seda, Portugal

Average daylight in September / Average sunshine in September - Seda, 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: 9.4h

Months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is January (Average sunshine: 5.1h).

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Average sunshine days in September
Seda, Portugal

Average sunshine days in September - Seda, Portugal
  • Average sunshine days in September: 23.8 days

The month with the most sunshine days is July (28.7 days).
The month with the least sunshine days is April (16.6 days).

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Average UV index in September
Seda, Portugal

Average UV index in September - Seda, 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, March, November and December (UV index 3).

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Average cloud cover in September
Seda, Portugal

Average cloud cover in September - Seda, Portugal
  • Average cloud cover in September: 17

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
Seda, Portugal

Average visibility in September - Seda, 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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