September weather forecast and climate
Roalde, Portugal

Weather in September

The first month of the autumn, September, is still a warm month in Roalde, Portugal, with average temperature varying between 25.5°C (77.9°F) and 12.1°C (53.8°F).

Temperature

In September, the average high-temperature marginally drops, from 28.6°C (83.5°F) in August, to a still warm 25.5°C (77.9°F). In Roalde, in September, the average low-temperature is 12.1°C (53.8°F).

Humidity

In September, the average relative humidity in Roalde is 60%.

Rainfall

In Roalde, in September, it is raining for 6.3 days, with typically 13mm (0.51") of accumulated precipitation. In Roalde, during the entire year, the rain falls for 107.8 days and collects up to 282mm (11.1") of precipitation.

Snowfall

April through October are months without snowfall in Roalde.

Daylight

The average length of the day in September is 12.5h.

Sunshine

In Roalde, the average sunshine in September is 9.3h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Roalde?

The average high-temperature, in September, in Roalde, Portugal, is 25.5°C (77.9°F), while the average low-temperature is 12.1°C (53.8°F).

What is the average humidity in September in Roalde?

The average relative humidity in September in Roalde, Portugal, is 60%.

How much does it rain in Roalde in September?

In September, in Roalde, the rain falls for 6.3 days. Throughout September, 13mm (0.51") of precipitation is accumulated.

When it does not snow in Roalde?

April through October are months without snowfall in Roalde, Portugal.

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

The average length of the day in September is 12.5h.

How long on average sun shines in September in Roalde?

The average sunshine in September in Roalde, Portugal, is 9.3h.

What is the UV index intensity in September in Roalde?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Roalde, Portugal

Average temperature in September - Roalde, Portugal
  • Average high temperature in September: 25.5°C

The warmest month (with the highest average high temperature) is July (28.8°C).
The month with the lowest average high temperature is January (9.4°C).

  • Average low temperature in September: 12.1°C

The month with the highest average low temperature is July (14.1°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).

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Average pressure in September
Roalde, Portugal

Average pressure in September - Roalde, Portugal
  • Average pressure in September: 1017.4mbar

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
Roalde, Portugal

Average wind speed in September - Roalde, Portugal
  • Average wind speed in September: 6.4km/h

The windiest month (with the highest average wind speed) is March (8.6km/h).
The calmest month (with the lowest average wind speed) is September (6.4km/h).

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Average humidity in September
Roalde, Portugal

Average humidity in September - Roalde, Portugal
  • Average humidity in September: 60%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (56%).

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Average rainfall in September
Roalde, Portugal

Average rainfall in September - Roalde, Portugal
  • Average rainfall in September: 13mm

The wettest month (with the highest rainfall) is December (49mm).
The driest month (with the least rainfall) is July (8mm).

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Average rainfall days in September
Roalde, Portugal

Average rainfall days in September - Roalde, Portugal
  • Average rainfall days in September: 6.3 days

The month with the highest number of rainy days is April (13.6 days).
The month with the least rainy days is August (3.9 days).

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Average snowfall in September
Roalde, Portugal

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

The month with the highest snowfall is February (7mm).
Months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average snowfall days in September
Roalde, Portugal

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

The month with the highest number of snowfall days is February (0.8 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Roalde, Portugal
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9.3h

The month with the most sunshine is July (Average sunshine: 11.4h).
The month with the least sunshine is January (Average sunshine: 4.1h).

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Average sunshine days in September
Roalde, Portugal

Average sunshine days in September - Roalde, Portugal
  • Average sunshine days in September: 22.1 days

The month with the most sunshine days is August (25.5 days).
The month with the least sunshine days is April (14.1 days).

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Average UV index in September
Roalde, Portugal

Average UV index in September - Roalde, Portugal
  • Average UV index in September: 5

Months with the highest UV index are July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Roalde, Portugal

Average cloud cover in September - Roalde, Portugal
  • Average cloud cover in September: 23

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in September
Roalde, Portugal

Average visibility in September - Roalde, Portugal
  • Average visibility in September: 9km

Months with the highest visibility are June, July, August and September (9km).
The month with the lowest visibility is January (6km).

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