INFORMATION ABOUT POLAND - Polish Travel, Polish Regency Tours / Bogdan Travel, Weather Essentially it is similar to the UK but it is less humid. The months of May, June & September can be very beautiful, July & August are the warmest. Average temperatures are 18-25 C. Winters can be much colder with snow and frost. Something to be experienced. Health & insurance There are reciprocal medical arrangements which entitle British and Irish citizens to free basic medical care in Poland. Full medical insurance is optional. We would however recommend travel and personal belongings insurance. PASSPORTS & VISA. Visitors from the UK & Ireland need a current passport but do not require a visa. Stay is for a maximum of 6 months and ideally your passport should be valid for at least this amount of time