September weather forecastPosejny, Poland
September
Weather in September
September, the first month of the autumn in Posejny, is still a comfortable month, with an average temperature fluctuating between 18°C (64.4°F) and 9.1°C (48.4°F).Temperature
A moderate decline in the average high-temperature is seen during September, decreasing from a warm 23.2°C (73.8°F) in August to a comfortable 18°C (64.4°F). An average low-temperature of 9.1°C (48.4°F) is recorded in the month of September in Posejny.Humidity
In Posejny, the average relative humidity in September is 78%.Rainfall
In Posejny, during September, the rain falls for 14.6 days and regularly aggregates up to 38mm (1.5") of precipitation. Throughout the year, there are 177.2 rainfall days, and 539mm (21.22") of precipitation is accumulated.Snowfall
June through September are months without snowfall in Posejny.Daylight
In Posejny, the average length of the day in September is 12h and 42min.On the first day of September, sunrise is at 05:35 and sunset at 19:17. On the last day of the month, sunrise is at 06:27 and sunset at 18:05 CEST.
Sunshine
The average sunshine in September in Posejny is 7.5h.UV index
In Posejny, Poland, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 3 suggests these recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Around midday, solar radiation is most harmful; hence, exposure should be limited. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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
Posejny, 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).
