Monthly average and maximum daily temperatures of the air in the period of 1956-2005, recorded at 9 meteorological stations situated along the coastal zone, were used in the study. Variability and frequency of maximum daily temperature, time trends and relationships of average air temperature were determined. Using the quantile method, extremely low (a 5% quantile) and extremely high (a 95% quantile) values of maximum daily air temperature were calculated, and the assessment of thermal conditions for Kołobrzeg station, was carried out year by year according to 11 quantile intervals. In the first half of the year (excluding June), a distinct increase in the maximum daily air temperature was observed, statistically significant in January (3.3oC/50 years) and in April (4.1oC/50 years), and there was a slight decrease in the temperature in autumn, mainly in September. The lowest monthly average air temperatures occurred in the western part of the coast in February, and in the north-eastern part in January during the period from March to November. The highest values of maximum daily air temperature of >20oC can occur along the seaside – from April to October >25oC, and from May to September >30oC; in winter these values do not exceed –1.0oC. The value of maximum daily air temperature in winter (December-March) is significantly affected by the atmospheric circulation from over the North Atlantic (NAO). At the seaside, the maximum daily air temperature gets higher and higher and less variable. Over the Polish coast of the Baltic Sea 3 zones of differentiated values of maximum daily air temperature can be distinguished.