September weather forecast and climate
Rossão, Portugal

Weather in September

September, the first month of the autumn, in Rossão, is still a warm month, with average temperature ranging between max 25.3°C (77.5°F) and min 12.3°C (54.1°F).

Temperature

In Rossão, Portugal, the average high-temperature is almost the same as in August - a still warm 25.3°C (77.5°F). The average low-temperature, in September, is 12.3°C (54.1°F).

Humidity

The average relative humidity in Rossão is 65%.

Rainfall

In September, in Rossão, the rain falls for 7.8 days. Throughout September, 31mm (1.22") of precipitation is accumulated. Throughout the year, there are 149.8 rainfall days, and 846mm (33.31") of precipitation is accumulated.

Snowfall

February through December are months without snowfall in Rossão.

Daylight

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

Sunshine

The average sunshine is 9h.

UV index

In September, the average daily maximum UV index in Rossão is 5. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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 Rossão?

The average high-temperature, in September, in Rossão, is 25.3°C (77.5°F), while the average low-temperature is 12.3°C (54.1°F).

What is the average humidity in September in Rossão?

In Rossão, the average relative humidity in September is 65%.

How many days does it rain in September in Rossão?

In Rossão, in September, during 7.8 rainfall days, 31mm (1.22") of precipitation is typically accumulated.

When it does not snow in Rossão?

In Rossão snow does not fall in February through December.

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

In Rossão, Portugal, the average length of the day in September is 12.5h.

How long on average sun shines in September in Rossão?

The average sunshine in September in Rossão is 9h.

What is the UV index intensity in September in Rossão?

In September, the average daily maximum UV index in Rossão, Portugal, is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Rossão, Portugal

Average temperature in September - Rossão, Portugal
  • Average high temperature in September: 25.3°C

The warmest month (with the highest average high temperature) is August (28°C).
The month with the lowest average high temperature is January (10.4°C).

  • Average low temperature in September: 12.3°C

The month with the highest average low temperature is August (13.7°C).
The coldest month (with the lowest average low temperature) is February (3.7°C).

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Average pressure in September
Rossão, Portugal

Average pressure in September - Rossão, Portugal
  • Average pressure in September: 1017.3mbar

The month with the highest atmospheric pressure is December (1022.7mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).

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Average wind speed in September
Rossão, Portugal

Average wind speed in September - Rossão, Portugal
  • Average wind speed in September: 6.3km/h

The windiest month (with the highest average wind speed) is March (8.2km/h).
The calmest month (with the lowest average wind speed) is September (6.3km/h).

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Average humidity in September
Rossão, Portugal

Average humidity in September - Rossão, Portugal
  • Average humidity in September: 65%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (62%).

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Average rainfall in September
Rossão, Portugal

Average rainfall in September - Rossão, Portugal
  • Average rainfall in September: 31mm

The wettest month (with the highest rainfall) is December (129mm).
The driest month (with the least rainfall) is July (10mm).

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Average rainfall days in September
Rossão, Portugal

Average rainfall days in September - Rossão, Portugal
  • Average rainfall days in September: 7.8 days

The month with the highest number of rainy days is April (17.1 days).
The month with the least rainy days is August (4.9 days).

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Average snowfall in September
Rossão, Portugal

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

The month with the highest snowfall is January (2mm).
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
Rossão, Portugal

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

The month with the highest number of snowfall days is January (0.2 days).
Months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in September / Average sunshine in September - Rossão, 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: 9h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is January (Average sunshine: 4.4h).

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Average sunshine days in September
Rossão, Portugal

Average sunshine days in September - Rossão, Portugal
  • Average sunshine days in September: 20.6 days

The month with the most sunshine days is August (24.6 days).
Months with the least sunshine days are April and November (10.8 days).

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Average UV index in September
Rossão, Portugal

Average UV index in September - Rossão, 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 and February (UV index 2).

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Average cloud cover in September
Rossão, Portugal

Average cloud cover in September - Rossão, Portugal
  • Average cloud cover in September: 26

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in September
Rossão, Portugal

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

Months with the highest visibility are August and September (9km).
Months with the lowest visibility are January and November (7km).

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