People are dying from extreme heat, which is also killing a large number of chickens and destroying tea plants
She breathed her last at 10:40 am on Tuesday at the Combined Military Hospital in Dhaka, said the deputy speaker's aide Swapan Kumar Biswas.
Anwara, who had been suffering from old-age complications for a while, died from a heart ailment, he said.
She will be laid to rest at the deputy speaker's ancestral home Gaibandha's Saghata.
President Abdul Hamid expressed deep shock over her passing and offered his condolences to the bereaved family.
Speaker Shirin Sharmin Chaudhury and Chief Whip Nur-E-Alam Chowdhury also expressed their condolences over her death in separate messages.