To clarify the mechanism of the recent record-breaking high temperature at Ekawasaki AMeDAS, we conducted statistical analyses using 35-years AMeDAS data since 1988 and the field observation around Ekawasaki in 2015. From the statistical analyses, the following results were obtained; (1) the overlaying the warm air mass around Shimanto region contributed to high temperature there; (2) daily maximum temperature increased with the number of the consecutive preceding sunny days; (3) the southeasterly and northwesterly wind possibly contributed to higher temperature at Ekawaski; (4) though Ekawazaki was not the hottest area in Japan climatologically, the record breaking event occurred due to the combination of the several factors mentioned above. Also, the field observation showed the sea breeze from the Pacific Ocean (southeasterly wind) can cool Ekawasaki.
