Białystok Weather in September

Białystok in September sees pleasant daytime temperatures of 19°C (66°F) and nighttime lows of 9°C (48°F). Rainfall is fairly high this month at around 65 mm (2.6 in), so pack a rain jacket to stay dry.

Rainfall in Białystok in September

Based on our climate data of the past 30 years, about 13 days of rain are anticipated, with 65 mm (2.6 in) on average. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Białystok in September

September in Białystok brings pleasant temperatures, with highs of 19°C (66°F) and nights around 9°C (48°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Białystok in September

The area enjoys a balanced 162 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Wind Speed in Białystok in September

Wind speeds average 2 m/s (4 knots) during September. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.

If you prefer dry days with pleasant temperatures, May, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit Poland, check out our Białystok's climate page.

Białystok Temperature in September

Min Temperature 9°C (48°F)  

Max Temperature 19°C (66°F)  

Chance of Rain 43%  

Precipitation 65 mm (2.6 in)  

Rainy days 13 days  

Humidity 78% *  

Windspeed 2 m/s (4 knots) *  

Sunshine 162 hours *  

Percentage Sunshine 42% *  

* Data from: Bialystok, Poland (3 KM, 2 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Białystok typically drop from around 20°C (68°F) at the start of September to approximately 15°C (59°F) by the end. Nights are cold, with lows typically ranging from 6°C (43°F) to 10°C (50°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Białystok in September

Browse day-by-day weather records for Białystok spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Białystok historical weather extremes in September

Our historical data for Białystok spans 1976 to 2025, revealing these weather extremes.

• Białystok recorded its highest September temperature of 30°C (86°F) on September 7, 2008.
• Białystok experienced its chilliest September day on September 30, 1993, reaching only 5°C (41°F).
• The coldest night in September in Białystok was on September 28, 1986, with a minimum of -4°C (25°F).

What to Wear in Białystok in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Białystok in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

10/10

Walking

10/10

Barbeque

7/10

Camping

4/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Poland, check out our Białystok's climate page.

More climate data for Białystok

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Białystok climate overview or explore weather in Poland.