September weather forecast and climate
Orvalho, Portugal

Weather in September

September, the first month of the autumn, in Orvalho, is still a warm month, with average temperature fluctuating between 28.6°C (83.5°F) and 15.4°C (59.7°F).

Temperature

In September, the average high-temperature slightly decreases, from a hot 32.8°C (91°F) in August, to a warm 28.6°C (83.5°F). The average low-temperature, in September, is 15.4°C (59.7°F).

Heat index

In September, the average heat index is calculated to 29°C (84.2°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity 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 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, wind, differences in body mass, height, and shape). 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 particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Orvalho, the average relative humidity in September is 49%.

Rainfall

In Orvalho, in September, it is raining for 5.2 days, with typically 18mm (0.71") of accumulated precipitation. In Orvalho, during the entire year, the rain falls for 97.2 days and collects up to 371mm (14.61") of precipitation.

Snowfall

February through December are months without snowfall in Orvalho.

Daylight

The average length of the day in September is 12.4h.

Sunshine

The average sunshine in September is 9.4h.

UV index

In Orvalho, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Orvalho?

In Orvalho, Portugal, in September, the average high-temperature is 28.6°C (83.5°F), and the average low-temperature is 15.4°C (59.7°F). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that factores the actual air temperature with the relative humidity, is calculated to 29°C (84.2°F).

What is the average humidity in September in Orvalho?

In Orvalho, Portugal, the average relative humidity in September is 49%.

How many days does it rain in September in Orvalho?

In Orvalho, Portugal, in September, during 5.2 rainfall days, 18mm (0.71") of precipitation is typically accumulated.

When it does not snow in Orvalho?

In Orvalho, Portugal, snow does not fall in February through December.

How many hours of daylight does Orvalho have in September?

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

How many hours of sunshine does Orvalho have in September?

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

How high is the UV index in September in Orvalho?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Orvalho, Portugal

Average temperature in September - Orvalho, Portugal
  • Average high temperature in September: 28.6°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: 15.4°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
Orvalho, Portugal

Average pressure in September - Orvalho, 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
Orvalho, Portugal

Average wind speed in September - Orvalho, 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
Orvalho, Portugal

Average humidity in September - Orvalho, 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
Orvalho, Portugal

Average rainfall in September - Orvalho, Portugal
  • Average rainfall in September: 18mm

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
Orvalho, Portugal

Average rainfall days in September - Orvalho, Portugal
  • Average rainfall days in September: 5.2 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
Orvalho, Portugal

Average snowfall in September - Orvalho, 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
Orvalho, Portugal

Average snowfall days in September - Orvalho, 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
Orvalho, Portugal

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

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

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Average sunshine days in September
Orvalho, Portugal

Average sunshine days in September - Orvalho, 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
Orvalho, Portugal

Average UV index in September - Orvalho, 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
Orvalho, Portugal

Average cloud cover in September - Orvalho, 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
Orvalho, Portugal

Average visibility in September - Orvalho, 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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