September weather forecastVallentuna, Sweden
September
Weather in September
September, the first month of the autumn in Vallentuna, is still a refreshing month, with an average temperature varying between 9.5°C (49.1°F) and 15.9°C (60.6°F).Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from an agreeable 20.6°C (69.1°F) in August to a mild 15.9°C (60.6°F). Vallentuna, in September, witnesses an average low-temperature of 9.5°C (49.1°F).Humidity
In Vallentuna, Sweden, the average relative humidity in September is 80%.Rainfall
In September, in Vallentuna, Sweden, the rain falls for 13.2 days. Throughout September, 27mm (1.06") of precipitation is accumulated. Throughout the year, in Vallentuna, there are 147.2 rainfall days, and 402mm (15.83") of precipitation is accumulated.Snowfall
June through September are months without snowfall in Vallentuna, Sweden.Daylight
In Vallentuna, the average length of the day in September is 12h and 51min.On the first day of September in Vallentuna, sunrise is at 05:45 and sunset at 19:49. On the last day of the month, sunrise is at 06:51 and sunset at 18:23 CEST.
Sunshine
In September, the average sunshine in Vallentuna, Sweden, is 7.9h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 3 during September leads to these instructions:
Guard yourself - Avoiding sunburn is suggested. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Vallentuna, Sweden
- Average high temperature in September: 15.9°C
The warmest month (with the highest average high temperature) is July (21.3°C).
The month with the lowest average high temperature is January (-0.7°C).
- Average low temperature in September: 9.5°C
The month with the highest average low temperature is July (12.9°C).
The coldest month (with the lowest average low temperature) is January (-3.9°C).
Average pressure in September
Vallentuna, Sweden
- Average pressure in September: 1013.3mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1007.7mbar).
Average wind speed in September
Vallentuna, Sweden
- Average wind speed in September: 13.6km/h
The windiest month (with the highest average wind speed) is December (17.7km/h).
The calmest months (with the lowest average wind speed) are July and August (12.2km/h).
Average humidity in September
Vallentuna, Sweden
- Average humidity in September: 80%
The months with the highest relative humidity are January, February and December (88%).
The month with the lowest relative humidity is May (71%).
Average rainfall in September
Vallentuna, Sweden
- Average rainfall in September: 27mm
The wettest month (with the highest rainfall) is July (55mm).
The driest month (with the least rainfall) is April (17mm).
Average rainfall days in September
Vallentuna, Sweden
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Vallentuna, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is February (105mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Vallentuna, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Vallentuna, Sweden
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 36min).
The month with the shortest days is December (Average daylight: 6h and 12min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 2h and 24min).
Average sunshine days in September
Vallentuna, Sweden
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is April (14.3 days).
The month with the least sunshine days is August (9.9 days).
Average UV index in September
Vallentuna, Sweden
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in September
Vallentuna, Sweden
- Average cloud cover in September: 44
The months with the most cloud cover are January and February (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in September
Vallentuna, Sweden
- Average visibility in September: 9km
The months with the highest visibility are April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February and March (8km).
