KARACHI, Pakistan — The temperature was still searingly high on Wednesday — 98 degrees Fahrenheit, or 37 degrees Celsius — but at least it was dropping. It had been as high as 113 degrees Fahrenheit, or 45 degrees Celsius.

Health and rescue officials said the number of deaths, which surpassed 800 during the four days that the merciless heat wave gripped this southern port city, had also fallen on Wednesday.

“Today was a lot better,” said Anwar Kazmi, a spokesman for the Edhi Foundation, which runs an ambulance service and Karachi’s largest morgue. “We’ve had 58 deaths today, compared to yesterday when the death toll rose to 300.”

Meteorologists said Karachi’s weather should improve in the days ahead. “There won’t be heavy rains, but there are chances of light rain in the city,” said Abdul Rashid, a meteorologist.