September weather forecast
Strömstad, Sweden

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Weather in September

September, the first month of the autumn in Strömstad, is also a moderate month, with an average temperature ranging between max 15.2°C (59.4°F) and min 11.5°C (52.7°F).

Temperature

A mild shift in the average high-temperature occurs in September, reducing from a refreshing 18.3°C (64.9°F) in August to a moderate 15.2°C (59.4°F). Nights during September maintain a steady temperature, averaging at a fresh 11.5°C (52.7°F).

Humidity

In Strömstad, the average relative humidity in September is 78%.

Rainfall

In Strömstad, in September, during 14.6 rainfall days, 52mm (2.05") of precipitation is typically accumulated. Throughout the year, in Strömstad, Sweden, there are 160.3 rainfall days, and 557mm (21.93") of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Sea temperature

In Strömstad, the average seawater temperature in September is 15.8°C (60.4°F).
Note: Swimming is not an enjoyable activity for the majority when the water is at 15.8°C (60.4°F). The difficulty of controlling breathing increases as the temperature dips from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in September is 12h and 50min.
On the first day of September in Strömstad, sunrise is at 06:14 and sunset at 20:15. On the last day of the month, sunrise is at 07:19 and sunset at 18:51 CEST.

Sunshine

The average sunshine in September in Strömstad is 8.2h.

UV index

The average daily maximum UV index in September in Strömstad is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. 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 usual temperature for Strömstad in September?

The average high-temperature and low-temperature in Strömstad during September are 15.2°C (59.4°F) and 11.5°C (52.7°F) respectively.

What is the average humidity in September in Strömstad?

In September, the average relative humidity is 78%.

How many days does it rain in September in Strömstad?

In Strömstad, Sweden, in September, during 14.6 rainfall days, 52mm (2.05") of precipitation is typically accumulated.

When it does not snow in Strömstad?

In Strömstad, snow does not fall in May through September.

Does it snow in Strömstad in September?

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

How cold is the water in September in Strömstad?

In September, the average sea temperature in Strömstad, Sweden, is 15.8°C (60.4°F). For swimming, a surface water temperature of 15.8°C (60.4°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Strömstad have in September?

In September, the average day length in Strömstad, Sweden, is 12h and 50min.

When is the sunrise / sunset in September in Strömstad?

On the first day of September, sunrise is at 06:14 and sunset at 20:15. On the last day of the month, sunrise is at 07:19 and sunset at 18:51 CEST.

How long on average sun shines in September in Strömstad?

In Strömstad, the average sunshine duration in September is 8.2h.

What is the UV index reading in September in Strömstad?

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

Average temperature in September
Strömstad, Sweden

Average temperature in September - Strömstad, Sweden
  • Average high temperature in September: 15.2°C

The warmest month (with the highest average high temperature) is July (19°C).
The month with the lowest average high temperature is February (0.9°C).

  • Average low temperature in September: 11.5°C

The months with the highest average low temperature are July and August (14.3°C).
The coldest month (with the lowest average low temperature) is February (-1.9°C).

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Average pressure in September
Strömstad, Sweden

Average pressure in September - Strömstad, Sweden
  • Average pressure in September: 1013mbar

The month with the highest atmospheric pressure is April (1014.3mbar).
The month with the lowest atmospheric pressure is December (1008mbar).

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Average wind speed in September
Strömstad, Sweden

Average wind speed in September - Strömstad, Sweden
  • Average wind speed in September: 19.1km/h

The windiest month (with the highest average wind speed) is December (22.2km/h).
The calmest month (with the lowest average wind speed) is June (16km/h).

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Average humidity in September
Strömstad, Sweden

Average humidity in September - Strömstad, Sweden
  • Average humidity in September: 78%

The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is May (73%).

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Average rainfall in September
Strömstad, Sweden

Average rainfall in September - Strömstad, Sweden
  • Average rainfall in September: 52mm

The wettest month (with the highest rainfall) is August (71mm).
The driest month (with the least rainfall) is April (25mm).

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Average rainfall days in September
Strömstad, Sweden

Average rainfall days in September - Strömstad, Sweden
  • Average rainfall days in September: 14.6 days

The month with the highest number of rainy days is August (17.8 days).
The month with the least rainy days is January (8.8 days).

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Average snowfall in September
Strömstad, Sweden

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

The month with the highest snowfall is January (55mm).
The months with the least snowfall are May, June, July, August and September (0mm).

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Average snowfall days in September
Strömstad, Sweden

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

The month with the highest number of snowfall days is February (9.3 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
Strömstad, Sweden

Average sea temperature in September - Strömstad, Sweden
  • Average sea temperature in September: 15.8°C

The best month for swimming (with the highest average sea temperature) is August (18.5°C).
The coldest month (with the lowest average sea temperature) is March (2.8°C).

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

Average daylight in September / Average sunshine in September - Strömstad, Sweden
  • Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 18h and 18min).
The month with the shortest days is December (Average daylight: 6h and 24min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 18min).

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Average sunshine days in September
Strömstad, Sweden

Average sunshine days in September - Strömstad, Sweden
  • Average sunshine days in September: 13.3 days

The month with the most sunshine days is April (17.3 days).
The month with the least sunshine days is December (10.8 days).

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Average UV index in September
Strömstad, Sweden

Average UV index in September - Strömstad, Sweden
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in September
Strömstad, Sweden

Average cloud cover in September - Strömstad, Sweden
  • Average cloud cover in September: 42

The month with the most cloud cover is February (Cloud cover 62).
The months with the least cloud cover are June and July (Cloud cover 37).

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Average visibility in September
Strömstad, Sweden

Average visibility in September - Strömstad, Sweden
  • Average visibility in September: 10km

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

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Strömstad, Sweden

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