September · Poland
Best time to visit Warsaw in September Weather, crowds & prices
Weather in Warsaw in September
Average temperature 16°C, 37 mm of rain, about 23 days with 6+ hours of sunshine and 71% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
9.6/10
Ranked #2 of 12 months
- Avg temp
- 16°C
- Rainfall
- 37 mm
- Humidity
- 71%
- Days with 6h+ sun
- 23
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
September in Warsaw scores 9.6/10 for sightseeing and cultural travel - one of the top 12-month picks (#2). Expect around 16°C, 37 mm of rain, and roughly 23 days with 6+ hours of sunshine this month.
Rebuilt Old Town squares, the Royal Route, and Vistula boulevards trace Warsaw's postwar reconstruction.
September is one of the strongest months in Warsaw (2nd)
Temperatures hover around 16°C (62°F) — the kind of month where neither heat nor cold forces the schedule.
With around 37 mm of rain, any showers tend to pass through rather than settle in; about 23 days with 6+ hours of sunshine and 12.6 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Warsaw at 9.6/10 (2nd of 12), just behind May at 9.6/10.
Pack layers you can shed by midday plus one warm layer for the evening.
Expect peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Warsaw in September?
- In September, Warsaw averages 16°C, 37 mm of rain, and about 23 days with 6+ hours of sunshine. Its climate-comfort score is 9.6/10.
- Is September a good time to visit Warsaw?
- September earns a 9.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Warsaw in September?
- Expect about 37 mm of rain in September. Average humidity is 71% and there are about 23 days with 6+ hours of sunshine.
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