September weather forecastSejny, Poland
September
Weather in September
September, the first month of the autumn in Sejny, is also an enjoyable month, with an average temperature fluctuating between 18°C (64.4°F) and 9.1°C (48.4°F).Temperature
In the transition to September, Sejny observes a drop in the average high-temperature, moving from a moderately hot 23.2°C (73.8°F) in August to a refreshing 18°C (64.4°F). Sejny experiences a nighttime temperature average of 9.1°C (48.4°F) during September.Humidity
In September, the average relative humidity is 78%.Rainfall
In Sejny, in September, during 14.6 rainfall days, 38mm (1.5") of precipitation is typically accumulated. In Sejny, during the entire year, the rain falls for 177.2 days and collects up to 539mm (21.22") of precipitation.Snowfall
June through September are months without snowfall in Sejny.Daylight
In Sejny, the average length of the day in September is 12h and 42min.On the first day of the month, sunrise is at 05:35 and sunset at 19:17. On the last day of September, sunrise is at 06:27 and sunset at 18:05 CEST.
Sunshine
In September, the average sunshine is 7.5h.UV index
In Sejny, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 3 during September translates into these guidelines:
Act with care - The need to guard against sun damage is communicated. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. 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
Average temperature in September
Sejny, Poland
- Average high temperature in September: 18°C
The warmest month (with the highest average high temperature) is July (23.3°C).
The month with the lowest average high temperature is January (-2°C).
- Average low temperature in September: 9.1°C
The months with the highest average low temperature are July and August (12.8°C).
The coldest month (with the lowest average low temperature) is January (-5.7°C).
Average pressure in September
Sejny, Poland
- Average pressure in September: 1016.7mbar
The month with the highest atmospheric pressure is October (1017.7mbar).
The month with the lowest atmospheric pressure is July (1013mbar).
Average wind speed in September
Sejny, Poland
- Average wind speed in September: 12km/h
The windiest month (with the highest average wind speed) is December (14.7km/h).
The calmest month (with the lowest average wind speed) is August (10.5km/h).
Average humidity in September
Sejny, Poland
- Average humidity in September: 78%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Sejny, Poland
- Average rainfall in September: 38mm
The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is April (30mm).
Average rainfall days in September
Sejny, Poland
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in September
Sejny, Poland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (168mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Sejny, Poland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sejny, Poland
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 30min).
- Average sunshine in September: 7h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 2h and 24min).
Average sunshine days in September
Sejny, Poland
- Average sunshine days in September: 11.6 days
The month with the most sunshine days is October (14.1 days).
The month with the least sunshine days is July (5.8 days).
Average UV index in September
Sejny, Poland
- Average UV index in September: 3
The months with the highest UV index are May, June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Sejny, Poland
- Average cloud cover in September: 44
The months with the most cloud cover are January and February (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in September
Sejny, Poland
- 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).
