Data on ambulance transport rate of patients with heat stroke from 2008 to 2018 in Japan were used to examine regional features and temporal variations of transport from climatological viewpoints. The transport rate is correlated with summer mean temperature both spatially and in year-to-year variations. Regarding seasonal variations, the transport rate is higher in early summer than in late summer by a factor of two or more. On a daily basis, the transport rate for days with specified maximum temperature levels tends to be higher in prefectures with cooler summer climate. These features are similar to those of heat-stroke mortality, although there are a number of differences in the climatological features of transport rate and mortality.