Abstract: Based on the datasets from the NCEP/NCAR reanalysis, NOAA-SST dataset, the Zhejiang conventional observation data, the climate characteristics high temperature weather and the high temperature physical cause of 2013 in Zhejiang were explored in this study. The results show that high temperature days of Zhejiang appeared most frequently in July, followed by August. There were more high temperature days in the west region and less ones in the east coast. In the summer of 2013, large sections of Zhejiang Province were hit by heat wave and less rain. It's the worst heat wave in recent 60 years. The high temperature days of Zhejiang in the summer of 2013 were much more than those in the summer of the perennial average. The history records of extreme maximum temperature were broken in few cities and countries frequently. Further evidence shows that the Northern Hemisphere atmospheric circulation anomaly, polar low eddy blocked in the polar region, Northwest Pacific subtropical high remained so stable and so long, the weak cold advent that those processes tended to be short duration and limited strengthness, the less influence by northward landfall typhoon, the warm-deeply ridge, the downdraft at middle and low layer during the period of the summer continuous high temperature in 2013.