September weather forecast
Sierki, Poland

September

Weather in September

September, the first month of the autumn in Sierki, is still a comfortable month, with temperature in the range of an average low of 9.5°C (49.1°F) and an average high of 18.3°C (64.9°F).

Temperature

The arrival of September corresponds with a temperature reduction, down from August's warm 24.2°C (75.6°F) to a comfortable 18.3°C (64.9°F). Throughout the month of September, Sierki reports a steady low-temperature average of 9.5°C (49.1°F).

Humidity

The average relative humidity in September is 76%.

Rainfall

In Sierki, in September, it is raining for 13.4 days, with typically 37mm (1.46") of accumulated precipitation. Throughout the year, there are 164.4 rainfall days, and 515mm (20.28") of precipitation is accumulated.

Snowfall

In Sierki, snow does not fall in May through September.

Daylight

In Sierki, the average length of the day in September is 12h and 41min.
On the first day of September, sunrise is at 05:39 and sunset at 19:18. On the last day of the month, sunrise is at 06:29 and sunset at 18:08 CEST.

Sunshine

In September, the average sunshine is 7.5h.

UV index

In Sierki, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: The UV index of 3 in September translates into these instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.

Frequently asked questions

What are the temperatures in September?
During September, Sierki experiences an average high-temperature of 18.3°C (64.9°F) and a low-temperature of 9.5°C (49.1°F).
What is the average humidity in September?
In September, the average relative humidity is 76%.
How much does it rain in September?
In September, the rain falls for 13.4 days. Throughout September, 37mm (1.46") of precipitation is accumulated.
When it does not snow?
In Sierki, Poland, snow does not fall in May through September.
Does it snow in September?
In Sierki, in September, it doesn't snow. In October, it regularly snows.
What is the average length of the day in September?
In Sierki, the average day length in September is 12h and 41min.
When are sunrise and sunset in September?
On the first day of September, sunrise is at 05:39 and sunset at 19:18. On the last day of the month, sunrise is at 06:29 and sunset at 18:08 CEST.
How many hours of sunshine does Sierki have in September?
The average sunshine duration in September is 7.5h.
What is the UV index reading in September?
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September
Sierki, Poland
  • Average high temperature in September: 18.3°C

The warmest months (with the highest average high temperature) are July and August (24.2°C).
The month with the lowest average high temperature is January (-1.5°C).

  • Average low temperature in September: 9.5°C

The month with the highest average low temperature is July (13.7°C).
The coldest month (with the lowest average low temperature) is January (-5.1°C).

Average pressure in September
Sierki, Poland
  • Average pressure in September: 1016.9mbar

The month with the highest atmospheric pressure is October (1018.2mbar).
The month with the lowest atmospheric pressure is July (1013.1mbar).

Average wind speed in September
Sierki, Poland
  • Average wind speed in September: 11.3km/h

The windiest month (with the highest average wind speed) is December (13.2km/h).
The calmest month (with the lowest average wind speed) is August (9.7km/h).

Average humidity in September
Sierki, Poland
  • Average humidity in September: 76%

The month with the highest relative humidity is January (92%).
The months with the lowest relative humidity are April and August (70%).

Average rainfall in September
Sierki, Poland
  • Average rainfall in September: 37mm

The wettest month (with the highest rainfall) is June (69mm).
The driest month (with the least rainfall) is April (27mm).

Average rainfall days in September
Sierki, Poland
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is July (20.4 days).
The month with the least rainy days is February (7.9 days).

Average snowfall in September
Sierki, Poland
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (192mm).
The months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days in September
Sierki, Poland
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (20.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Sierki, Poland
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).

  • Average sunshine in September: 7h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 2h and 12min).

Average sunshine days in September
Sierki, Poland
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is October (15.5 days).
The months with the least sunshine days are January and February (6.8 days).

Average UV index in September
Sierki, Poland
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

Average cloud cover in September
Sierki, Poland
  • Average cloud cover in September: 43

The months with the most cloud cover are January and February (Cloud cover 79).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in September
Sierki, Poland
  • Average visibility in September: 9km

The months with the highest visibility are April, May, June, July, August, September and October (9km).
The month with the lowest visibility is January (6km).

englishespañol中文
Share