The climate of Bialystok is moderately continental, characterized by cold winters, with temperatures often below freezing (0 °C or 32 °F), and mild or pleasantly warm summers.
The city is located in eastern Poland, near the border with Belarus.
The average temperature of the coldest month (January) is of -3.2 °C (26 °F), that of the warmest month (July) is of 17.9 °C (64 °F). Here are the average temperatures.
Bialystok - Average temperatures
Min (°C)-6-6-327101211740-4
Max (°C)-1061319212423171250
Min (°F)212127364550545245393225
Max (°F)303243556670757363544132

Precipitation amounts to 575 millimeters (22.6 inches) per year: so, it is at an intermediate level. It ranges from 25 mm (1 in) in the driest month (February) to 75 mm (3 in) in the wettest (July). Here is the average precipitation.
Bialystok - Average precipitation

On average, there are around 1,740 sunshine hours per year. Here are the average sunshine hours per day.
Bialystok - Sunshine


Best Time

The best time to visit Bialystok runs from mid-May to mid-September, since it is the warmest and sunniest period of the year. Sometimes, it can be hot in July and August, while in other circumstances, nights can be cool or even a little cold even in these months, so it can be useful to bring a sweatshirt or sweater and a light jacket for the evening.