September weather forecast and climate
Barcelona, Spain

The artistic Park Gull designed by Gaudi in Barcelona, Spain
The artistic Park Gull designed by Gaudi in Barcelona, Spain

Weather in September

September, the first month of the autumn, in Barcelona, is also a moderately hot month, with average temperature ranging between min 19.2°C (66.6°F) and max 24.5°C (76.1°F).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 27.5°C (81.5°F) in August, to a still warm 24.5°C (76.1°F). In Barcelona, in September, the average low-temperature is 19.2°C (66.6°F).

Humidity

In Barcelona, the average relative humidity in September is 71%.

Rainfall

In Barcelona, it is raining for 13.8 days, with typically 48mm (1.89") of accumulated precipitation. Throughout the year, there are 117.9 rainfall days, and 435mm (17.13") of precipitation is accumulated.

Snowfall

January, February and September are months with snowfall in Barcelona. Months with the most snowfall are January, February and September, with an average 1mm (0.04") of accumulated snow.

Sea temperature

In Barcelona, the average seawater temperature is 24.2°C (75.6°F).
Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 24.2°C (75.6°F).

Daylight

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

Sunshine

In September, the average sunshine is 9.1h.

UV index

Months with the highest UV index in Barcelona, Spain, are June through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Barcelona?

In September, the average high-temperature is 24.5°C (76.1°F), and the average low-temperature is 19.2°C (66.6°F).

What is the average humidity in September in Barcelona?

In Barcelona, Spain, the average relative humidity in September is 71%.

How many days does it rain in September in Barcelona?

In September, in Barcelona, Spain, the rain falls for 13.8 days. Throughout September, 48mm (1.89") of precipitation is accumulated.

When does it start snowing in Barcelona?

September is the first month it typically snows in Barcelona, Spain. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow.

What is the snowiest month in Barcelona?

Months with the most snowfall in Barcelona are January, February and September, with an average 1mm (0.04") of accumulated snow.

How warm is the water in September in Barcelona?

In September, the average sea temperature is 24.2°C (75.6°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24.2°C (75.6°F) water may be enjoyable.

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

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

How many hours of sunshine does Barcelona have in September?

In Barcelona, the average sunshine in September is 9.1h.

What are the months with the highest UV index in Barcelona?

June through September, with an average maximum UV index of 6, are months with the highest UV index in Barcelona.

What is the UV index intensity in September in Barcelona?

In Barcelona, Spain, 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 radiation.

Average temperature in September
Barcelona, Spain

Average temperature in September - Barcelona, Spain
  • Average high temperature in September: 24.5°C

The warmest month (with the highest average high temperature) is August (27.5°C).
The month with the lowest average high temperature is January (12.4°C).

  • Average low temperature in September: 19.2°C

The month with the highest average low temperature is August (22.1°C).
The coldest month (with the lowest average low temperature) is February (7.1°C).

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Average pressure in September
Barcelona, Spain

Average pressure in September - Barcelona, Spain
  • Average pressure in September: 1017mbar

The month with the highest atmospheric pressure is December (1020.7mbar).
The month with the lowest atmospheric pressure is April (1014.7mbar).

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Average wind speed in September
Barcelona, Spain

Average wind speed in September - Barcelona, Spain
  • Average wind speed in September: 9.6km/h

The windiest month (with the highest average wind speed) is March (12.1km/h).
The calmest month (with the lowest average wind speed) is August (9.3km/h).

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Average humidity in September
Barcelona, Spain

Average humidity in September - Barcelona, Spain
  • Average humidity in September: 71%

Months with the highest relative humidity are April and October (72%).
Months with the lowest relative humidity are February, June and November (68%).

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Average rainfall in September
Barcelona, Spain

Average rainfall in September - Barcelona, Spain
  • Average rainfall in September: 48mm

The wettest month (with the highest rainfall) is October (73mm).
The driest month (with the least rainfall) is February (16mm).

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Average rainfall days in September
Barcelona, Spain

Average rainfall days in September - Barcelona, Spain
  • Average rainfall days in September: 13.8 days

The month with the highest number of rainy days is September (13.8 days).
The month with the least rainy days is December (6.4 days).

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Average snowfall in September
Barcelona, Spain

Average snowfall in September - Barcelona, Spain
  • Average snowfall in September: 1mm

Months with the highest snowfall are January, February and September (1mm).
Months with the least snowfall are March, April, May, June, July, August, October, November and December (0mm).

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Average snowfall days in September
Barcelona, Spain

Average snowfall days in September - Barcelona, Spain
  • Average snowfall days in September: 0.1 days

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

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Average sea temperature in September
Barcelona, Spain

Average sea temperature in September - Barcelona, Spain
  • Average sea temperature in September: 24.2°C

The best month for swimming (with the highest average sea temperature) is August (25.3°C).
The coldest month (with the lowest average sea temperature) is February (13.1°C).

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Average daylight in September /
Average sunshine in September
Barcelona, Spain

Average daylight in September / Average sunshine in September - Barcelona, Spain
  • 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: 9.2h).

  • Average sunshine in September: 9.1h

Months with the most sunshine are June and July (Average sunshine: 11.7h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Barcelona, Spain

Average sunshine days in September - Barcelona, Spain
  • Average sunshine days in September: 12.3 days

The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is September (12.3 days).

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Average UV index in September
Barcelona, Spain

Average UV index in September - Barcelona, Spain
  • Average UV index in September: 6

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February and December (UV index 3).

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Average cloud cover in September
Barcelona, Spain

Average cloud cover in September - Barcelona, Spain
  • Average cloud cover in September: 24

The month with the most cloud cover is April (Cloud cover 31).
The month with the least cloud cover is July (Cloud cover 16).

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Average visibility in September
Barcelona, Spain

Average visibility in September - Barcelona, Spain
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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