Although weather is just one factor, it can really affect your travel plans, especially if you're planning an extended stay in Bialowieza. The hottest months are usually August and July, with an average temperature of 18°C, while the coldest months are January and February, with an average of -1°C. The snowiest months in Bialowieza are January, December, November and February, with each month seeing an average of 29 cm of snowfall.