Long-term weather forecast
Long-term weather forecast

September weather forecast and Climate
Warsaw, Poland

A view of the old town square of Warsaw, Poland, on a warm summer day, and clear skies
A view of the old town square of Warsaw, Poland, on a warm summer day, and clear skies
September brings autumn to Warsaw with the weather cooling down mildly but remaining warm and pleasant. Tourism carries on with the tolerable temperatures in the range of 9°C (48.2°F) and 18°C (64.4°F) making excellent time to visit the museums and galleries as crowds and queues are minimal. There is a general price drop in most services as most tourists start to leave Warsaw.
The evenings feel colder than usual, and warm dressing remains necessary. Packing an umbrella is essential too, as rain is experienced for about thirteen days in September, collecting precipitation of 40.6mm (1.6") on average.
  • The average high temperature in September: 17.9°C

The warmest month (with the highest average high temperature) is July (23.6°C).
The month with the lowest average high temperature is January (0.4°C).

  • The average low temperature in September: 8.6°C

The month with the highest average low temperature is July (12.9°C).
The coldest month (with the lowest average low temperature) is January (-4.8°C).

  • The average rainfall in September: 47.3mm

The wettest month (with the highest rainfall) is July (72.9mm).
The driest month (with the lowest rainfall) is February (26.1mm).

  • The average rainfall days in September: 12 days

The month with the highest number of rainy days is December (16 days).
Months with the lowest number of rainy days are April, May, August and September (12 days).

  • The average daylight in September: 13h

The month with the longest days is June (Average daylight: 17h).
Months with shortest days are January and December (Average daylight: 8h).

  • The average sunshine in September: 5h

Months with most sunshine are June and July (Average sunshine: 8h).
Months with least sunshine are January and December (Average sunshine: 1).

  • The average UV index in September: 4

Months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 0).