September · Poland
Best time to visit Białystok in September Weather, crowds & prices
Weather in Białystok in September
Average temperature 16°C, 40 mm of rain, about 9 days with 6+ hours of sunshine and 69% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.7/10
Ranked #3 of 12 months
- Avg temp
- 16°C
- Rainfall
- 40 mm
- Humidity
- 69%
- Days with 6h+ sun
- 9
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Białystok scores 8.7/10 for sightseeing and cultural travel - one of the top 12-month picks (#3). Expect around 16°C, 40 mm of rain, and roughly 9 days with 6+ hours of sunshine this month.
Białystok's baroque Branicki palace and garden give eastern Poland a Versailles of its own.
September in Białystok — one of the year's strongest windows (3rd)
September averages 16°C (61°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Expect 40 mm of rain — occasional showers rather than washed-out days — alongside about 9 days with 6+ hours of sunshine and 12.4 daylight hours.
A 8.7/10 puts this among the year's best months in Białystok (3rd of 12); only August scores higher, at 9.4/10.
Pack layers you can shed by midday plus one warm layer for the evening.
Plan for mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Białystok in September?
- In September, Białystok averages 16°C, 40 mm of rain, and about 9 days with 6+ hours of sunshine. Its climate-comfort score is 8.7/10.
- Is September a good time to visit Białystok?
- September earns a 8.7/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Białystok in September?
- Expect about 40 mm of rain in September. Average humidity is 69% and there are about 9 days with 6+ hours of sunshine.
Curated in Białystok
Tickets & experiences
Things to do in Białystok
Białystok, Poland. Live activities and tours from GetYourGuide, matched to this destination.