September weather forecastVallsta, Sweden
September
Weather in September
September, the first month of the autumn in Vallsta, is also a moderate month, with an average temperature fluctuating between 6.9°C (44.4°F) and 14.5°C (58.1°F).Temperature
September ushers in a minute temperature change, with average high-temperatures reducing from August's comfortable 19.3°C (66.7°F) to a still refreshing 14.5°C (58.1°F). An average temperature of 6.9°C (44.4°F) is recorded during the nights in September.Humidity
The average relative humidity in September is 81%.Rainfall
In Vallsta, in September, during 10.7 rainfall days, 23mm (0.91") of precipitation is typically accumulated. In Vallsta, during the entire year, the rain falls for 122.8 days and collects up to 298mm (11.73") of precipitation.Snowfall
In Vallsta, snow does not fall in June through September.Daylight
In Vallsta, the average length of the day in September is 12h and 55min.On the first day of September, sunrise is at 05:46 and sunset at 20:01. On the last day of the month, sunrise is at 07:00 and sunset at 18:28 CEST.
Sunshine
In September, the average sunshine is 7.2h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The UV index of 3 during September leads to these advisories:
Ensure safety - Imperative it is to shield skin and eyes from damage. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Vallsta, Sweden
- Average high temperature in September: 14.5°C
The warmest month (with the highest average high temperature) is July (20.8°C).
The month with the lowest average high temperature is January (-3°C).
- Average low temperature in September: 6.9°C
The month with the highest average low temperature is July (11.2°C).
The coldest month (with the lowest average low temperature) is January (-7.2°C).
Average pressure in September
Vallsta, Sweden
- Average pressure in September: 1012.4mbar
The month with the highest atmospheric pressure is May (1014.4mbar).
The month with the lowest atmospheric pressure is December (1006.5mbar).
Average wind speed in September
Vallsta, Sweden
- Average wind speed in September: 9.8km/h
The windiest month (with the highest average wind speed) is December (11km/h).
The calmest month (with the lowest average wind speed) is August (8.8km/h).
Average humidity in September
Vallsta, Sweden
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (67%).
Average rainfall in September
Vallsta, Sweden
- Average rainfall in September: 23mm
The wettest month (with the highest rainfall) is July (43mm).
The driest month (with the least rainfall) is April (13mm).
Average rainfall days in September
Vallsta, Sweden
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Vallsta, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is March (120mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Vallsta, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (14.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Vallsta, Sweden
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 19h and 18min).
The month with the shortest days is December (Average daylight: 5h and 30min).
- Average sunshine in September: 7h and 12min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in September
Vallsta, Sweden
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is September (15.9 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Vallsta, 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, March, November and December (UV index 1).
Average cloud cover in September
Vallsta, Sweden
- Average cloud cover in September: 53
The month with the most cloud cover is February (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 45).
Average visibility in September
Vallsta, Sweden
- Average visibility in September: 8km
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January, February and March (6km).
