September weather forecast
Le Portel, France

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Weather in September

The first month of the autumn, September, is also an enjoyable month in Le Portel, France, with an average temperature ranging between min 13.8°C (56.8°F) and max 17.8°C (64°F).

Temperature

Le Portel, France, registers an average high-temperature of a still enjoyable 17.8°C (64°F) at the commencement of September, closely related to the preceding month. In Le Portel, the nocturnal temperatures throughout September show a marginal dip from the daytime averages, settling at a still refreshing 13.8°C (56.8°F).

Humidity

August and September, with an average relative humidity of 79%, are the least humid months.

Rainfall

In Le Portel, in September, it is raining for 13.2 days, with typically 31mm (1.22") of accumulated precipitation. In Le Portel, during the entire year, the rain falls for 175.8 days and collects up to 430mm (16.93") of precipitation.

Snowfall

In Le Portel, France, snow does not fall in April through October.

Sea temperature

August and September, with an average sea temperature of 17.8°C (64°F), are months with the warmest seawater in Le Portel, France.
Note: In 17.8°C (64°F), swimming is not an enjoyable activity for most. As the temperature decreases from 21°C (69.8°F) to 15°C (59°F), it becomes harder to control breathing.

Daylight

In Le Portel, the average length of the day in September is 12h and 37min.
On the first day of the month, sunrise is at 07:08 and sunset at 20:38. On the last day of September, in Le Portel, sunrise is at 07:53 and sunset at 19:33 CEST.

Sunshine

In September, the average sunshine in Le Portel is 7.4h.

UV index

In Le Portel, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 4 during September translates into the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
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Frequently asked questions

What is the temperature in September in Le Portel?

In September, in Le Portel, the average high-temperature is 17.8°C (64°F), and the average low-temperature is 13.8°C (56.8°F).

What is the least humid month in Le Portel?

The months with the lowest humidity in Le Portel, France, are August and September, with an average relative humidity of 79%.

What is the average humidity in September in Le Portel?

The average relative humidity in September in Le Portel, France, is 79%.

How much does it rain in Le Portel in September?

In Le Portel, in September, it is raining for 13.2 days, with typically 31mm (1.22") of accumulated precipitation.

When it does not snow in Le Portel?

April through October are months without snowfall in Le Portel.

What are the months with the warmest sea water in Le Portel?

The months with the warmest seawater in Le Portel, France, are August and September, with an average sea temperature of 17.8°C (64°F).

What is the sea water temperature in September in Le Portel?

In Le Portel, France, in September, the average water temperature is 17.8°C (64°F). Swimming in 17.8°C (64°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in September in Le Portel?

In Le Portel, France, the average day length in September is 12h and 37min.

What time are sunrise and sunset in September in Le Portel?

On the first day of September, sunrise is at 07:08 and sunset at 20:38. On the last day of the month, sunrise is at 07:53 and sunset at 19:33 CEST.

How long on average sun shines in September in Le Portel?

The average sunshine duration in September is 7.4h.

What is the UV index intensity in September in Le Portel?

In September, the average daily maximum UV index in Le Portel, France, is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
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
Le Portel, France

Average temperature in September - Le Portel, France
  • Average high temperature in September: 17.8°C

The warmest month (with the highest average high temperature) is August (19.6°C).
The month with the lowest average high temperature is January (7°C).

  • Average low temperature in September: 13.8°C

The month with the highest average low temperature is August (15.7°C).
The coldest month (with the lowest average low temperature) is January (4.1°C).

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Average pressure in September
Le Portel, France

Average pressure in September - Le Portel, France
  • Average pressure in September: 1017.5mbar

The month with the highest atmospheric pressure is September (1017.5mbar).
The month with the lowest atmospheric pressure is November (1011.6mbar).

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Average wind speed in September
Le Portel, France

Average wind speed in September - Le Portel, France
  • Average wind speed in September: 19.8km/h

The windiest month (with the highest average wind speed) is December (27.4km/h).
The calmest month (with the lowest average wind speed) is July (18.1km/h).

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Average humidity in September
Le Portel, France

Average humidity in September - Le Portel, France
  • Average humidity in September: 79%

The months with the highest relative humidity are January, June and December (83%).
The months with the lowest relative humidity are August and September (79%).

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Average rainfall in September
Le Portel, France

Average rainfall in September - Le Portel, France
  • Average rainfall in September: 31mm

The wettest month (with the highest rainfall) is December (54mm).
The driest months (with the least rainfall) are April and May (19mm).

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Average rainfall days in September
Le Portel, France

Average rainfall days in September - Le Portel, France
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is November (17.9 days).
The month with the least rainy days is April (11.5 days).

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Average snowfall in September
Le Portel, France

Average snowfall in September - Le Portel, France
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (21mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average snowfall days in September
Le Portel, France

Average snowfall days in September - Le Portel, France
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Le Portel, France

Average sea temperature in September - Le Portel, France
  • Average sea temperature in September: 17.8°C

The best months for swimming (with the highest average sea temperature) are August and September (17.8°C).
The coldest month (with the lowest average sea temperature) is March (7.7°C).

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Average daylight in September /
Average sunshine in September
Le Portel, France

Average daylight in September / Average sunshine in September - Le Portel, France
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).

  • Average sunshine in September: 7h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is November (Average sunshine: 4h and 12min).

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Average sunshine days in September
Le Portel, France

Average sunshine days in September - Le Portel, France
  • Average sunshine days in September: 12.2 days

The month with the most sunshine days is April (15.4 days).
The month with the least sunshine days is November (9.2 days).

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Average UV index in September
Le Portel, France

Average UV index in September - Le Portel, France
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February and November (UV index 2).

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Average cloud cover in September
Le Portel, France

Average cloud cover in September - Le Portel, France
  • Average cloud cover in September: 40

The month with the most cloud cover is November (Cloud cover 59).
The months with the least cloud cover are April and August (Cloud cover 38).

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Average visibility in September
Le Portel, France

Average visibility in September - Le Portel, France
  • Average visibility in September: 10km

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).

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Le Portel, France

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