Coastal tourism is one of the most attractive and a popular activity all over the world which is growing fast and has been transmuted into a multi-purpose activity. In this regard, weather conditions and climatic circumstances are considered factors effective on tourism industry and generally life, health and welfare of human beings. Considering climatic circumstances, we can choose type of tourism attraction and plan specifically. One of the methods through which the extent of welfare can be investigated bioclimaticaly is Becker method.In order to statistically evaluate the bioclimatic circumstances of human being in coastal line of Guilan province, climatic elements such as temperature (minimum and maximum) and wind speed were collected for a period of 20 years from synoptic stations in Astra, Anzali, Rasht and Ramsar. Ramsar station was selected as a neighboring and climatically similar station and due to absence of a synoptic station with 20-year data in East of Guilan province.Evaluating the 4 stations according to Becker index showed that costal line in Guilan possesses optimal and relatively optimal climatic circumstances at least during 7 months of a year.