Białystok
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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.

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).

Białystok Weather by Month

Pick a month to see the average temperature, rainfall and sunshine in Białystok - and find the best time to visit.

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

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

Historical weather records 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.

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).

Best Places in Poland in September

Find out more about the weather in Poland and which places have the best travel conditions in this month. See all of Poland in September →

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

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

Białystok 3-Day Forecast

More climate data for Białystok

Popular in September

Where to go in September - average daytime high across popular destinations.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.