Why does Karachi receive most of its rain during June through August?

Karachi receives the majority of its annual rainfall during the months of June, July, and August primarily due to the influence of the monsoon system.12

Pakistan is situated on the edge of this monsoonal wet-dry system, which brings moisture to the region in intermittent bursts during the summer months. While precipitation throughout the country is generally erratic and variable, the coastal areas—including Karachi—also receive some of their limited annual rainfall from tropical storms originating in the Arabian Sea.3

Although Karachi’s average annual rainfall is relatively low at approximately 8 inches (203 mm), the concentration of this precipitation during the summer months is a defining characteristic of the local climate.13