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
Weather in September
Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from an enjoyable 18.8°C (65.8°F) in August to a mild 15.5°C (59.9°F). När observes an average low-temperature of 13.3°C (55.9°F) during the slightly cooler nights of September.Humidity
In September, the average relative humidity is 78%.Rainfall
In När, in September, during 11.1 rainfall days, 27mm (1.06") of precipitation is typically accumulated. Throughout the year, in När, there are 128.4 rainfall days, and 290mm (11.42") of precipitation is accumulated.Snowfall
May through October are months without snowfall in När.Daylight
In När, Sweden, the average length of the day in September is 12h and 47min.On the first day of September in När, sunrise is at 05:48 and sunset at 19:42. On the last day of the month, sunrise is at 06:48 and sunset at 18:22 CEST.
Sunshine
In September, the average sunshine is 8.4h.UV index
In När, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. The Sun's radiation is especially intense around midday; try to stay in shade during this period. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Frequently asked questions
What are the temperatures in När in September?
What is the average humidity in September in När?
How many days does it rain in September in När?
When it does not snow in När?
How many hours of daylight does När have in September?
When is the sunrise / sunset in September in När?
How many hours of sunshine does När have in September?
What is the UV index intensity in September in När?
Average temperature in September
När, Sweden
- Average high temperature in September: 15.5°C
The warmest months (with the highest average high temperature) are July and August (18.8°C).
The month with the lowest average high temperature is February (1.8°C).
- Average low temperature in September: 13.3°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (-0.3°C).
Average pressure in September
När, Sweden
- Average pressure in September: 1014.4mbar
The month with the highest atmospheric pressure is May (1015.3mbar).
The month with the lowest atmospheric pressure is December (1009.5mbar).
Average wind speed in September
När, Sweden
- Average wind speed in September: 22.3km/h
The windiest month (with the highest average wind speed) is December (27.4km/h).
The calmest month (with the lowest average wind speed) is May (17.8km/h).
Average humidity in September
När, Sweden
- Average humidity in September: 78%
The month with the highest relative humidity is November (84%).
The months with the lowest relative humidity are June and August (77%).
Average rainfall in September
När, Sweden
- Average rainfall in September: 27mm
The wettest month (with the highest rainfall) is July (33mm).
The driest month (with the least rainfall) is April (10mm).
Average rainfall days in September
När, Sweden
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is November (14 days).
The month with the least rainy days is February (6.4 days).
Average snowfall in September
När, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is February (46mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
När, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
När, Sweden
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 17h and 48min).
The month with the shortest days is December (Average daylight: 6h and 48min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 2h and 48min).
Average sunshine days in September
När, Sweden
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is April (20.3 days).
The month with the least sunshine days is December (8.1 days).
Average UV index in September
När, 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
När, Sweden
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 71).
The months with the least cloud cover are June and August (Cloud cover 32).
Average visibility in September
När, 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).
När, Sweden
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