Television footage from India's Himachal Pradesh state showed houses flattened by landslides.
Israel was faced with a major heatwave on Saturday that was expected to continue into Sunday as well.
"The video," United Hatzala explained in a statement, "serves as a powerful reminder of the life-threatening consequences that can result from negligence with regard to leaving children in cars."
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Wednesday will bring clear skies and a further increase in temperatures, returning the country to an uncomfortable heat.
German analyst Haustein said temperatures will continue to increase unless fossil fuel use is drastically cut worldwide.
Periods of extreme heat are likely to hit every two to five years if average global temperatures rise 2C above pre-industrial levels.
There were 19 people at the gymnasium when the accident occured. Four people escaped and 15 were trapped, the municipal search and rescue headquarters said, according to state media said.
Parts of northern Italy have also seen intense hail storms as the hot weather broke down there in the last few days.
It was estimated that at least 225 people lived in the hamlet, the state's deputy chief minister, Devendra Fadnavis, told the state assembly.