Warsaw weather in September
“Mild and bright — an underrated time to visit.”
Roughly 10 rainy days across the month, on average.
In september, Warsaw settles into its kind, mild rhythm. The city keeps a different pulse than in summer or midwinter, and travellers who arrive with the right expectations are rewarded.
Days average around 20°C (68°F), cooling to 11°C after sunset. Rainfall is moderate — around 10 rainy days spread through the month. Long days of sunshine reward early starts.
These figures are climatological averages, drawn from a decade of daily records via the Open-Meteo Archive — not a forecast. But they are honest, and they are the sort of thing a good travel guide ought to tell you before you book the flight.
What to pack for Warsaw in September
- •A light layer for cool mornings and evenings
- •Reef-safe sunscreen and polarised sunglasses
- •Comfortable, broken-in walking shoes
- •A small daypack that won't look like a tourist beacon
What to pack for Warsaw in September
- →Breathable travel pantsAmazon · shop this
- →Compact travel umbrellaAmazon · shop this
- →Reef-safe sunscreen SPF 50Amazon · shop this
- →Polarized sunglassesAmazon · shop this
- →Universal travel adapterAmazon · shop this
- →Compression packing cubesAmazon · shop this
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Warsaw in September — FAQ
Q01Is September a good time to visit Warsaw?
Is September a good time to visit Warsaw?
Yes — this is one of the best months of the year to visit. In September, Warsaw averages a high of 20°C (68°F) and a low of 11°C (53°F), with 60mm of rainfall across roughly 10 rainy days.
Q02What is the average temperature in Warsaw in September?
What is the average temperature in Warsaw in September?
The average high temperature in Warsaw during September is 20°C (68°F), with an average low of 11°C (53°F). These figures are averaged from 11 complete years of daily records (2015–2025, Open-Meteo Archive).
Q03How many rainy days does Warsaw have in September?
How many rainy days does Warsaw have in September?
Warsaw averages approximately 10 rainy days in September, with a total monthly rainfall of about 60mm. This is based on daily precipitation records where days with 1mm or more of rain are counted as rainy days.
Q04What should I pack for Warsaw in September?
What should I pack for Warsaw in September?
For Warsaw in September, pack layered clothing for changing temperatures, sunscreen and sunglasses, comfortable walking shoes. These recommendations are based on 11 complete years of weather averages for this specific month.
Q05How crowded is Warsaw in September?
How crowded is Warsaw in September?
Tourist crowds in Warsaw during September are typically moderate — shoulder season, a sweet spot between crowds and weather. Consider this when planning accommodation — prices track crowd levels closely.