September weather forecastJärna, Sweden
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Järna, Sweden, with temperature in the range of an average low of 9.6°C (49.3°F) and an average high of 16°C (60.8°F).Temperature
With the beginning of September, the average high-temperature shows a small decrease, transitioning from a pleasant 20.7°C (69.3°F) in August to a refreshing 16°C (60.8°F). During September, Järna observes a consistent average nighttime temperature of 9.6°C (49.3°F).Humidity
In September, the average relative humidity in Järna is 80%.Rainfall
In Järna, Sweden, in September, during 11.5 rainfall days, 24mm (0.94") of precipitation is typically accumulated. In Järna, during the entire year, the rain falls for 131.4 days and collects up to 350mm (13.78") of precipitation.Snowfall
In Järna, Sweden, snow does not fall in June through September.Daylight
The average length of the day in September in Järna is 12h and 50min.On the first day of the month, sunrise is at 05:48 and sunset at 19:50. On the last day of September, in Järna, sunrise is at 06:53 and sunset at 18:25 CEST.
Sunshine
The average sunshine in September is 8.2h.UV index
In September, the average daily maximum UV index in Järna is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 3 suggests these recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Järna, Sweden
- Average high temperature in September: 16°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 (-0.5°C).
- Average low temperature in September: 9.6°C
The month with the highest average low temperature is July (13.2°C).
The coldest month (with the lowest average low temperature) is February (-3.6°C).
Average pressure in September
Järna, Sweden
- Average pressure in September: 1013.5mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008mbar).
Average wind speed in September
Järna, Sweden
- Average wind speed in September: 14km/h
The windiest month (with the highest average wind speed) is December (18km/h).
The calmest months (with the lowest average wind speed) are July and August (12.5km/h).
Average humidity in September
Järna, Sweden
- Average humidity in September: 80%
The months with the highest relative humidity are January, February, November and December (88%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Järna, Sweden
- Average rainfall in September: 24mm
The wettest month (with the highest rainfall) is July (44mm).
The driest month (with the least rainfall) is April (15mm).
Average rainfall days in September
Järna, Sweden
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Järna, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is February (87mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Järna, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (11 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Järna, Sweden
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 24min).
The month with the shortest days is December (Average daylight: 6h and 18min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is June (Average sunshine: 12h and 18min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in September
Järna, Sweden
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is May (16.9 days).
The months with the least sunshine days are June and July (13.6 days).
Average UV index in September
Järna, 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
Järna, Sweden
- Average cloud cover in September: 42
The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in September
Järna, Sweden
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).
