I am not sure if this is true. This is from my state (which is in South India) this year (March-April) when the temperature was in the 35-40 degrees range. Highest recorded was 42 degrees I think in a border district. I don't think South India crosses 40 most of the time. One place reached 47 in 2016 [3].

>With mercury levels in Kerala rising this summer, the state’s Labour Department has issued an order allowing mandatory break time for labourers to avoid sunstroke. All labourers in the state who are exposed to sunlight which could potentially lead to a sunstroke have been ordered to rest indoors between 12 pm and 3 pm during the summer months.

>“Those working in the morning shift will get a break from 12 pm to 3 pm. Their work timings have been fixed at 8 hours from 7 in the morning to 7 in the evening. For the other shifts which begin after morning and post noon will be rescheduled to end before 12 pm and begin after 3 pm,” read the order.

>In 2018 too, the State Labour Department had issued a similar order to reschedule the shift timings of labourers during the months of February and April to avoid exposure to heat from 12 pm to 3 pm. [1]

[1] https://www.thenewsminute.com/article/kerala-govt-orders-man...

[2] https://english.manoramaonline.com/districts/thiruvananthapu...

[3] https://www.indiatoday.in/education-today/gk-current-affairs...