September weather forecastVisby, Sweden
September
Weather in September
September, the first month of the autumn in Visby, is still a refreshing month, with an average temperature fluctuating between 12.9°C (55.2°F) and 15.6°C (60.1°F).Temperature
Visby's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's refreshing 19.4°C (66.9°F) to a moderate 15.6°C (60.1°F). Visby records a slight downturn in temperature to an average of 12.9°C (55.2°F) during September nights.Humidity
In Visby, the average relative humidity in September is 78%.Rainfall
In Visby, during September, the rain falls for 13.5 days and regularly aggregates up to 32mm (1.26") of precipitation. Throughout the year, in Visby, there are 138.9 rainfall days, and 352mm (13.86") of precipitation is accumulated.Snowfall
In Visby, snow does not fall in June through September.Sea temperature
In Visby, Sweden, the average seawater temperature in September is 15.8°C (60.4°F).Note: 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).
Daylight
In September, the average length of the day in Visby is 12h and 47min.On the first day of the month, sunrise is at 05:48 and sunset at 19:44. On the last day of September, in Visby, sunrise is at 06:49 and sunset at 18:23 CEST.
Sunshine
In September, the average sunshine is 8.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Adopt protective measures - It is advised to guard against sun damage. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Visby, Sweden
- Average high temperature in September: 15.6°C
The warmest month (with the highest average high temperature) is July (19.8°C).
The month with the lowest average high temperature is February (1.8°C).
- Average low temperature in September: 12.9°C
The month with the highest average low temperature is August (15.6°C).
The coldest month (with the lowest average low temperature) is February (-0.7°C).
Average pressure in September
Visby, Sweden
- Average pressure in September: 1014.3mbar
The month with the highest atmospheric pressure is May (1015.2mbar).
The month with the lowest atmospheric pressure is December (1009.3mbar).
Average wind speed in September
Visby, Sweden
- Average wind speed in September: 20.7km/h
The windiest month (with the highest average wind speed) is December (25.2km/h).
The calmest month (with the lowest average wind speed) is May (16.6km/h).
Average humidity in September
Visby, Sweden
- Average humidity in September: 78%
The month with the highest relative humidity is November (84%).
The months with the lowest relative humidity are May and June (75%).
Average rainfall in September
Visby, Sweden
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is July (42mm).
The driest month (with the least rainfall) is April (13mm).
Average rainfall days in September
Visby, Sweden
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is October (14.4 days).
The month with the least rainy days is February (7 days).
Average snowfall in September
Visby, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is January (63mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Visby, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Visby, Sweden
- Average sea temperature in September: 15.8°C
The best month for swimming (with the highest average sea temperature) is August (18.9°C).
The coldest months (with the lowest average sea temperature) are February and March (1.8°C).
Average daylight in September /
Average sunshine in September
Visby, Sweden
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 0min).
The month with the shortest days is December (Average daylight: 6h and 42min).
- Average sunshine in September: 8h and 24min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Visby, Sweden
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is May (18.2 days).
The month with the least sunshine days is December (9.1 days).
Average UV index in September
Visby, Sweden
- 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 and February (UV index 1).
Average cloud cover in September
Visby, Sweden
- Average cloud cover in September: 40
The months with the most cloud cover are January and December (Cloud cover 70).
The months with the least cloud cover are June and August (Cloud cover 32).
Average visibility in September
Visby, Sweden
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, November and December (9km).
