Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
September is characterized by a slight reduction in average high-temperature, easing from a refreshing 19.8°C (67.6°F) in August to a mild 15.4°C (59.7°F). The average temperature during September nights is registered at a chilly 9.1°C (48.4°F).Humidity
The average relative humidity in September is 80%.Rainfall
In September, the rain falls for 13.8 days. Throughout September, 42mm (1.65") of precipitation is accumulated. In Björneborg, Sweden, during the entire year, the rain falls for 150 days and collects up to 473mm (18.62") of precipitation.Snowfall
In Björneborg, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 50min.On the first day of September in Björneborg, Sweden, sunrise is at 06:01 and sunset at 20:04. On the last day of the month, sunrise is at 07:06 and sunset at 18:38 CEST.
Sunshine
In September, the average sunshine in Björneborg is 7.5h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the UV index of 3 transforms into the following advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The Sun's radiation is especially intense around midday; try to stay in shade during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Björneborg?
What is the average humidity in September in Björneborg?
How much does it rain in Björneborg in September?
When it does not snow in Björneborg?
Does it snow in Björneborg in September?
How many hours of daylight does Björneborg have in September?
When are sunrise and sunset in September in Björneborg?
How long on average sun shines in September in Björneborg?
What is the UV index intensity in September in Björneborg?
Average temperature in September
Björneborg, Sweden
- Average high temperature in September: 15.4°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 (-1°C).
- Average low temperature in September: 9.1°C
The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is February (-4.3°C).
Average pressure in September
Björneborg, Sweden
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is May (1014.4mbar).
The month with the lowest atmospheric pressure is December (1008.1mbar).
Average wind speed in September
Björneborg, Sweden
- Average wind speed in September: 12.9km/h
The windiest month (with the highest average wind speed) is December (14.1km/h).
The calmest month (with the lowest average wind speed) is August (11.6km/h).
Average humidity in September
Björneborg, Sweden
- Average humidity in September: 80%
The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is May (69%).
Average rainfall in September
Björneborg, Sweden
- Average rainfall in September: 42mm
The wettest month (with the highest rainfall) is July (52mm).
The driest month (with the least rainfall) is April (21mm).
Average rainfall days in September
Björneborg, Sweden
- Average rainfall days in September: 13.8 days
The months with the highest number of rainy days are July and August (16.7 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in September
Björneborg, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is January (148mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Björneborg, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (14.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Björneborg, Sweden
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 30min).
The month with the shortest days is December (Average daylight: 6h and 18min).
- Average sunshine in September: 7h and 3min
The month with the most sunshine is June (Average sunshine: 12h and 24min).
The month with the least sunshine is February (Average sunshine: 3h and 0min).
Average sunshine days in September
Björneborg, Sweden
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is April (15.2 days).
The month with the least sunshine days is November (10.2 days).
Average UV index in September
Björneborg, 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 and December (UV index 1).
Average cloud cover in September
Björneborg, Sweden
- Average cloud cover in September: 48
The month with the most cloud cover is February (Cloud cover 71).
The month with the least cloud cover is June (Cloud cover 42).
Average visibility in September
Björneborg, 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 and February (7km).
