September weather forecastVästerås, Sweden
September
Weather in September
September in Västerås, Sweden, brings forth clear signs of Autumn, as temperatures continue to fall from August, reaching an average high of 16.1°C (61°F). The cityscape transforms into a sea of rusty hues as leaves change color. Rainfall starts to take precedence over the city's weather once again, replacing the predominantly sunny days of summer. Locals start swapping their summer attire for warmer clothes in anticipation of the colder months. By the end of this month, the city steels itself for the increased cold that October brings.Temperature
September in Västerås reveals a small adjustment in temperature, transitioning from an average high of an agreeable 20.7°C (69.3°F) in August to a comfortable 16.1°C (61°F). In the month of September, the average temperature dips to a chilly 8.9°C (48°F) during the night.Humidity
In September, the average relative humidity is 79%.Rainfall
In September, the rain falls for 8.1 days. Throughout September, 15mm (0.59") of precipitation is accumulated. In Västerås, during the entire year, the rain falls for 105.3 days and collects up to 174mm (6.85") of precipitation.Snowfall
In Västerås, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 51min.On the first day of September, sunrise is at 05:51 and sunset at 19:56. On the last day of the month, sunrise is at 06:58 and sunset at 18:29 CEST.
Sunshine
In Västerås, the average sunshine in September is 8h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 3 in September transforms into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Västerås, Sweden
- Average high temperature in September: 16.1°C
The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is January (-1.2°C).
- Average low temperature in September: 8.9°C
The month with the highest average low temperature is July (12.5°C).
The coldest months (with the lowest average low temperature) are January and February (-4.9°C).
Average pressure in September
Västerås, Sweden
- Average pressure in September: 1013.3mbar
The month with the highest atmospheric pressure is May (1014.6mbar).
The month with the lowest atmospheric pressure is December (1007.7mbar).
Average wind speed in September
Västerås, Sweden
- Average wind speed in September: 12.5km/h
The windiest month (with the highest average wind speed) is December (15.2km/h).
The calmest month (with the lowest average wind speed) is August (11.3km/h).
Average humidity in September
Västerås, Sweden
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (71%).
Average rainfall in September
Västerås, Sweden
- Average rainfall in September: 15mm
The wettest month (with the highest rainfall) is July (25mm).
The driest months (with the least rainfall) are February and April (9mm).
Average rainfall days in September
Västerås, Sweden
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is January (4 days).
Average snowfall in September
Västerås, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is January (39mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Västerås, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Västerås, 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: 8h and 0min
The month with the most sunshine is June (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in September
Västerås, Sweden
- Average sunshine days in September: 19.2 days
The month with the most sunshine days is September (19.2 days).
The month with the least sunshine days is July (14.4 days).
Average UV index in September
Västerås, 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 and February (UV index 1).
Average cloud cover in September
Västerås, Sweden
- Average cloud cover in September: 46
The month with the most cloud cover is February (Cloud cover 67).
The months with the least cloud cover are June and July (Cloud cover 42).
Average visibility in September
Västerås, Sweden
- Average visibility in September: 9km
The months with the highest visibility are April, May, June, July, August, September and October (9km).
The months with the lowest visibility are January, February, March, November and December (8km).
