Weather in Warsaw in September 2025
Average weather
Average temperature in Warsaw in September
Going from a maximum of +86°F during the day to a minimum of +46°F during the night, the temperature in September averages around +75°F.
The average maximum temperature goes down 14% by the end of the month, compared with the beginning of the month, from +70°F to +64°F.
Is Warsaw warm or cold in September?
Warsaw is typically mild in September.
Maximum temperatures go down compared to the previous month from +75°F to +64°F. The minimum temperature also goes down from +55°F to +48°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Warsaw:
Climate in Warsaw in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +75°F | +64°F | +55°F | ||||
| Min. temperature | ||||||
| +41°F | +32°F | +19°F | ||||
| Max. temperature | ||||||
| +97°F | +93°F | +79°F | ||||
| Rainfall | ||||||
| 99 mm | 73 mm | 47 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Humidity | ||||||
| 73% | 79% | 83% | ||||
| Air pressure | ||||||
| 1013 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 4 | 3 | 4 | ||||
| Cloudy days | ||||||
| 9 | 11 | 13 | ||||
| Rainy days | ||||||
| 18 | 16 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting colder in September. From +75°F in the day, the average maximum temperature lowers to +64°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 99 mm to 73 mm. Humidity rises from 73% to 79%. The average wind speed doesn’t change much during September, staying around 2 m/s. The days becoming less sunny, going from 4 sunny days in August to 3 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Warsaw is gradually increasing during September, going from 3 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Warsaw?
Climate Change Over the Years
The climate in Warsaw in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1980 (+50°F) and the highest in 2020 (+60°F). The driest year was 2005 with only 348 mm of rainfall, and the wettest year was 2016 with 2739 mm.
FAQ
Is September a good time to visit Warsaw?
Can you sunbathe in Warsaw in September?
Is Warsaw rainy in September?
Is it sunny in Warsaw in September?
Other cities in Poland
Monthly weather in Warsaw
Source of the data
For this page, we’ve looked at the typical weather in Warsaw, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.