September weather forecast
Sundsvall, Sweden

Weather in September

The first month of the autumn, September, is still a mild month in Sundsvall, Sweden, with temperature in the range of an average high of 14°C (57.2°F) and an average low of 7.3°C (45.1°F).

Temperature

In Sundsvall, the average high-temperature in September marginally drops from a comfortable 18.7°C (65.7°F) in August to a moderate 14°C (57.2°F). In Sundsvall, in September, the average low-temperature is 7.3°C (45.1°F).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Sundsvall, during September, the rain falls for 11.7 days and regularly aggregates up to 32mm (1.26") of precipitation. In Sundsvall, during the entire year, the rain falls for 117.2 days and collects up to 384mm (15.12") of precipitation.

Snowfall

In Sundsvall, snow does not fall in June through September.

Sea temperature

In Sundsvall, Sweden, the average water temperature is 12°C (53.6°F).
Note: Swimming in 12°C (53.6°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in September in Sundsvall is 12h and 57min.
On the first day of the month, sunrise is at 05:39 and sunset at 20:02. On the last day of September, sunrise is at 06:55 and sunset at 18:26 CEST.

Sunshine

In September, the average sunshine in Sundsvall is 7.6h.

UV index

In Sundsvall, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 3 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Sundsvall?

The average relative humidity in September in Sundsvall, Sweden, is 79%.

How much does it rain in Sundsvall in September?

In Sundsvall, during September, the rain falls for 11.7 days and regularly aggregates up to 32mm (1.26") of precipitation.

When it does not snow in Sundsvall?

In Sundsvall, snow does not fall in June through September.

Does it snow in Sundsvall in September?

In Sundsvall, in September, it doesn't snow. In October, it regularly snows.

How cold is the water in September in Sundsvall?

In Sundsvall, the average seawater temperature in September is 12°C (53.6°F). Swimming in 12°C (53.6°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

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

In Sundsvall, the average day length in September is 12h and 57min.

When is the sunrise / sunset in September in Sundsvall?

On the first day of September in Sundsvall, Sweden, sunrise is at 05:39 and sunset at 20:02. On the last day of the month, sunrise is at 06:55 and sunset at 18:26 CEST.

How many hours of sunshine does Sundsvall have in September?

The average sunshine duration in September in Sundsvall, Sweden, is 7.6h.

What is the UV index reading in September in Sundsvall?

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sundsvall, Sweden

Average temperature in September - Sundsvall, Sweden
  • Average high temperature in September: 14°C

The warmest month (with the highest average high temperature) is July (20.3°C).
The month with the lowest average high temperature is January (-3°C).

  • Average low temperature in September: 7.3°C

The month with the highest average low temperature is July (11.4°C).
The coldest month (with the lowest average low temperature) is February (-6.9°C).

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Average pressure in September
Sundsvall, Sweden

Average pressure in September - Sundsvall, Sweden
  • Average pressure in September: 1011.9mbar

The month with the highest atmospheric pressure is May (1014.3mbar).
The month with the lowest atmospheric pressure is December (1005.9mbar).

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Average wind speed in September
Sundsvall, Sweden

Average wind speed in September - Sundsvall, Sweden
  • Average wind speed in September: 10.5km/h

The windiest month (with the highest average wind speed) is January (11.9km/h).
The calmest month (with the lowest average wind speed) is August (9.5km/h).

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Average humidity in September
Sundsvall, Sweden

Average humidity in September - Sundsvall, Sweden
  • Average humidity in September: 79%

The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is June (66%).

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Average rainfall in September
Sundsvall, Sweden

Average rainfall in September - Sundsvall, Sweden
  • Average rainfall in September: 32mm

The wettest month (with the highest rainfall) is July (45mm).
The driest month (with the least rainfall) is April (19mm).

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Average rainfall days in September
Sundsvall, Sweden

Average rainfall days in September - Sundsvall, Sweden
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall in September
Sundsvall, Sweden

Average snowfall in September - Sundsvall, Sweden
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (217mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in September
Sundsvall, Sweden

Average snowfall days in September - Sundsvall, Sweden
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (15.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Sundsvall, Sweden

Average sea temperature in September - Sundsvall, Sweden
  • Average sea temperature in September: 12°C

The best month for swimming (with the highest average sea temperature) is August (15°C).
The coldest months (with the lowest average sea temperature) are January, February and March (1°C).

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

Average daylight in September / Average sunshine in September - Sundsvall, Sweden
  • Average daylight in September: 12h and 57min

The month with the longest days is June (Average daylight: 19h and 46min).
The month with the shortest days is December (Average daylight: 5h and 12min).

  • Average sunshine in September: 7h and 36min

The month with the most sunshine is June (Average sunshine: 12h and 18min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).

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Average sunshine days in September
Sundsvall, Sweden

Average sunshine days in September - Sundsvall, Sweden
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is October (17.6 days).
The month with the least sunshine days is February (12.5 days).

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Average UV index in September
Sundsvall, Sweden

Average UV index in September - Sundsvall, Sweden
  • Average UV index in September: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in September
Sundsvall, Sweden

Average cloud cover in September - Sundsvall, Sweden
  • Average cloud cover in September: 49

The month with the most cloud cover is February (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 42).

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Average visibility in September
Sundsvall, Sweden

Average visibility in September - Sundsvall, Sweden
  • Average visibility in September: 8km

The months with the highest visibility are April, May, June, July, August and October (9km).
The months with the lowest visibility are January, February and March (7km).

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