September weather forecast and climate
Vällviken, Sweden

Weather in September

September, the first month of the autumn, in Vällviken, is still a cool month, with average temperature ranging between max 12.6°C (54.7°F) and min 5.7°C (42.3°F).

Temperature

In September, the average high-temperature marginally drops, from an enjoyable 17.5°C (63.5°F) in August, to a fresh 12.6°C (54.7°F). In September, the average low-temperature is 5.7°C (42.3°F).

Humidity

In September, the average relative humidity is 80%.

Rainfall

In Vällviken, it is raining for 13.5 days, with typically 37mm (1.46") of accumulated precipitation. In Vällviken, during the entire year, the rain falls for 122.4 days and collects up to 377mm (14.84") of precipitation.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 5mm (0.2") of snow. Throughout the year, there are 97.8 snowfall days, and 978mm (38.5") of snow is accumulated.

Daylight

In Vällviken, the average length of the day in September is 13h.

Sunshine

In September, the average sunshine is 7.3h.

UV index

The average daily maximum UV index in Vällviken, Sweden, is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 2 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. 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 Vällviken?

The average high-temperature, in September, in Vällviken, Sweden, is 12.6°C (54.7°F), while the average low-temperature is 5.7°C (42.3°F).

What is the average humidity in September in Vällviken?

In September, the average relative humidity in Vällviken, Sweden, is 80%.

How much does it rain in Vällviken in September?

In Vällviken, in September, during 13.5 rainfall days, 37mm (1.46") of precipitation is typically accumulated.

When does it start snowing in Vällviken?

September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 5mm (0.2") of snow.

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

In Vällviken, the average length of the day in September is 13h.

How long on average sun shines in September in Vällviken?

The average sunshine in September in Vällviken is 7.3h.

What is the UV index reading in September in Vällviken?

The average daily maximum UV index in September in Vällviken is 2. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Vällviken, Sweden

Average temperature in September - Vällviken, Sweden
  • Average high temperature in September: 12.6°C

The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is January (-4.8°C).

  • Average low temperature in September: 5.7°C

The month with the highest average low temperature is July (9.8°C).
The coldest months (with the lowest average low temperature) are January and February (-9.6°C).

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Average pressure in September
Vällviken, Sweden

Average pressure in September - Vällviken, Sweden
  • Average pressure in September: 1011.7mbar

The month with the highest atmospheric pressure is May (1014.5mbar).
The month with the lowest atmospheric pressure is December (1005.8mbar).

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Average wind speed in September
Vällviken, Sweden

Average wind speed in September - Vällviken, Sweden
  • Average wind speed in September: 12.8km/h

The windiest month (with the highest average wind speed) is June (14.3km/h).
The calmest month (with the lowest average wind speed) is August (11.6km/h).

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Average humidity in September
Vällviken, Sweden

Average humidity in September - Vällviken, Sweden
  • Average humidity in September: 80%

The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is June (67%).

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Average rainfall in September
Vällviken, Sweden

Average rainfall in September - Vällviken, Sweden
  • Average rainfall in September: 37mm

The wettest month (with the highest rainfall) is July (50mm).
The driest month (with the least rainfall) is February (18mm).

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Average rainfall days in September
Vällviken, Sweden

Average rainfall days in September - Vällviken, Sweden
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (4 days).

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Average snowfall in September
Vällviken, Sweden

Average snowfall in September - Vällviken, Sweden
  • Average snowfall in September: 5mm

The month with the highest snowfall is December (192mm).
Months with the least snowfall are June, July and August (0mm).

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Average snowfall days in September
Vällviken, Sweden

Average snowfall days in September - Vällviken, Sweden
  • Average snowfall days in September: 0.5 days

The month with the highest number of snowfall days is January (17 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Vällviken, Sweden

Average daylight in September / Average sunshine in September - Vällviken, Sweden
  • Average daylight in September: 13h

The month with the longest days is June (Average daylight: 20.2h).
The month with the shortest days is December (Average daylight: 4.9h).

  • Average sunshine in September: 7.3h

The month with the most sunshine is July (Average sunshine: 11.7h).
The month with the least sunshine is December (Average sunshine: 1.6h).

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Average sunshine days in September
Vällviken, Sweden

Average sunshine days in September - Vällviken, Sweden
  • Average sunshine days in September: 12.8 days

The month with the most sunshine days is October (15.1 days).
The month with the least sunshine days is December (11.4 days).

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Average UV index in September
Vällviken, Sweden

Average UV index in September - Vällviken, Sweden
  • Average UV index in September: 2

Months with the highest UV index are June and July (UV index 4).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Vällviken, Sweden

Average cloud cover in September - Vällviken, Sweden
  • Average cloud cover in September: 50

Months with the most cloud cover are January and December (Cloud cover 62).
Months with the least cloud cover are July and August (Cloud cover 45).

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Average visibility in September
Vällviken, Sweden

Average visibility in September - Vällviken, Sweden
  • Average visibility in September: 9km

The month with the highest visibility is June (10km).
Months with the lowest visibility are January and February (7km).

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