September weather forecast
Portalegre, Portugal

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Weather in September

September brings noticeable changes to Portalegre's weather. As the transition month from summer to autumn, temperatures begin to decrease after reaching their yearly highs. The climate starts cooling down, offering rejuvenating weather to visitors. Even with an average high of 29.4°C (84.9°F), it's generally less humid than peak summer months, making temperature more tolerable. The rare and modest rain spells make this month strikingly beautiful.

Temperature

A modest decline in the average high-temperature is seen during September, decreasing from a hot 33.3°C (91.9°F) in August to a warm 29.4°C (84.9°F). Portalegre reports a sharp reduction in temperature during September, averaging at a comfortable 16.3°C (61.3°F) at night.

Heat index

September's mean heat index is appraised at a hot 30°C (86°F). Continuous exposure and activity could induce a sense of tiredness and subsequently, heat cramps.
Data suggests that the heat index is set for environments in shade and with a light wind. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance 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

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

Rainfall

In Portalegre, in September, it is raining for 4.8 days, with typically 8mm (0.31") of accumulated precipitation. Throughout the year, there are 78.7 rainfall days, and 219mm (8.62") of precipitation is accumulated.

Snowfall

In Portalegre, snow does not fall in April through December.

Daylight

The average length of the day in September in Portalegre is 12h and 26min.
On the first day of September, sunrise is at 06:58 and sunset at 20:00. On the last day of the month, sunrise is at 07:25 and sunset at 19:13 WEST.

Sunshine

In September, the average sunshine in Portalegre is 9.5h.

UV index

The average daily maximum UV index in September in Portalegre is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 6 during September translates into the following guidance:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
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Frequently asked questions

How hot is September in Portalegre?

In September, the average high-temperature and low-temperature in Portalegre are 29.4°C (84.9°F) and 16.3°C (61.3°F) respectively. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, in September is appraised at 30°C (86°F).

What is the average humidity in September in Portalegre?

In September, the average relative humidity is 48%.

How much does it rain in Portalegre in September?

In September, the rain falls for 4.8 days. Throughout September, 8mm (0.31") of precipitation is accumulated.

When it does not snow in Portalegre?

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

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

In September, the average day length is 12h and 26min.

When are sunrise and sunset in September in Portalegre?

On the first day of September in Portalegre, sunrise is at 06:58 and sunset at 20:00. On the last day of the month, sunrise is at 07:25 and sunset at 19:13 WEST.

How many hours of sunshine does Portalegre have in September?

In Portalegre, Portugal, the average sunshine duration in September is 9.5h.

What is the UV index intensity in September in Portalegre?

In September, the average daily maximum UV index in Portalegre is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Portalegre, Portugal

Average temperature in September - Portalegre, Portugal
  • Average high temperature in September: 29.4°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
Portalegre, Portugal

Average pressure in September - Portalegre, 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
Portalegre, Portugal

Average wind speed in September - Portalegre, 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
Portalegre, Portugal

Average humidity in September - Portalegre, 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
Portalegre, Portugal

Average rainfall in September - Portalegre, Portugal
  • Average rainfall in September: 8mm

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
Portalegre, Portugal

Average rainfall days in September - Portalegre, Portugal
  • Average rainfall days in September: 4.8 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
Portalegre, Portugal

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

The month with the highest snowfall is February (5mm).
The 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
Portalegre, Portugal

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

The month with the highest number of snowfall days is February (0.4 days).
The 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
Portalegre, Portugal

Average daylight in September / Average sunshine in September - Portalegre, Portugal
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 3min

The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).

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Average sunshine days in September
Portalegre, Portugal

Average sunshine days in September - Portalegre, Portugal
  • Average sunshine days in September: 24 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
Portalegre, Portugal

Average UV index in September - Portalegre, Portugal
  • Average UV index in September: 6

The month with the highest UV index is August (UV index 7).
The 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
Portalegre, Portugal

Average cloud cover in September - Portalegre, Portugal
  • Average cloud cover in September: 16

The month with the most cloud cover is January (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 8).

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Average visibility in September
Portalegre, Portugal

Average visibility in September - Portalegre, Portugal
  • Average visibility in September: 10km

The 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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Portalegre, Portugal

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