September weather forecast and climate
Nisa, Portugal

Weather in September

The first month of the autumn, September, is also a moderately hot month in Nisa, Portugal, with average temperature varying between 16.3°C (61.3°F) and 29.4°C (84.9°F).

Temperature

In Nisa, the average high-temperature slightly decreases, from a hot 33.3°C (91.9°F) in August, to a warm 29.4°C (84.9°F). In September, the average low-temperature is 16.3°C (61.3°F).

Heat index

In September, the average heat index is estimated at 29.9°C (85.8°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, clothing, pregnancy, and metabolic differences affect individual temperature impact. 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 especially crucial for babies and toddlers. 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 September, the average relative humidity is 48%.

Rainfall

In Nisa, during September, the rain falls for 4.8 days and regularly aggregates up to 8mm (0.31") of precipitation. Throughout the year, there are 78.7 rainfall days, and 219mm (8.62") of precipitation is accumulated.

Snowfall

In Nisa snow does not fall in April through December.

Daylight

In Nisa, Portugal, the average length of the day is 12.4h.

Sunshine

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

UV index

In September, the average daily maximum UV index in Nisa is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Nisa?

The average high-temperature, in September, in Nisa, Portugal, is 29.4°C (84.9°F), while the average low-temperature is 16.3°C (61.3°F). In September, 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, is evaluated at 29.9°C (85.8°F).

What is the average humidity in September in Nisa?

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

How much does it rain in Nisa in September?

In Nisa, in September, it is raining for 4.8 days, with typically 8mm (0.31") of accumulated precipitation.

When it does not snow in Nisa?

In Nisa snow does not fall in April through December.

How many hours of daylight does Nisa have in September?

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

How many hours of sunshine does Nisa have in September?

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

How high is the UV index in September in Nisa?

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV rays.

Average temperature in September
Nisa, Portugal

Average temperature in September - Nisa, 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
Nisa, Portugal

Average pressure in September - Nisa, 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
Nisa, Portugal

Average wind speed in September - Nisa, 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
Nisa, Portugal

Average humidity in September - Nisa, 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
Nisa, Portugal

Average rainfall in September - Nisa, 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
Nisa, Portugal

Average rainfall days in September - Nisa, 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
Nisa, Portugal

Average snowfall in September - Nisa, 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
Nisa, Portugal

Average snowfall days in September - Nisa, 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
Nisa, Portugal

Average daylight in September / Average sunshine in September - Nisa, 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: 9.4h).

  • Average sunshine in September: 9.5h

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
Nisa, Portugal

Average sunshine days in September - Nisa, 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
Nisa, Portugal

Average UV index in September - Nisa, 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
Nisa, Portugal

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

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
Nisa, Portugal

Average visibility in September - Nisa, 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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