<P> The southwestern summer monsoons occur from July through September . The Thar Desert and adjoining areas of the northern and central Indian subcontinent heat up considerably during the hot summers . This causes a low pressure area over the northern and central Indian subcontinent . To fill this void, the moisture - laden winds from the Indian Ocean rush into the subcontinent . These winds, rich in moisture, are drawn towards the Himalayas . The Himalayas act like a high wall, blocking the winds from passing into Central Asia, and forcing them to rise . As the clouds rise their temperature drops and precipitation occurs . Some areas of the subcontinent receive up to 10,000 mm (390 in) of rain annually . </P> <P> The southwest monsoon is generally expected to begin around the beginning of June and fade away by the end of September . The moisture - laden winds on reaching the southernmost point of the Indian Peninsula, due to its topography, become divided into two parts: the Arabian Sea Branch and the Bay of Bengal Branch . </P> <P> The Arabian Sea Branch of the Southwest Monsoon first hits the Western Ghats of the coastal state of Kerala, India, thus making this area the first state in India to receive rain from the Southwest Monsoon . This branch of the monsoon moves northwards along the Western Ghats (Konkan and Goa) with precipitation on coastal areas, west of the Western Ghats . The eastern areas of the Western Ghats do not receive much rain from this monsoon as the wind does not cross the Western Ghats . </P> <P> The Bay of Bengal Branch of Southwest Monsoon flows over the Bay of Bengal heading towards North - East India and Bengal, picking up more moisture from the Bay of Bengal . The winds arrive at the Eastern Himalayas with large amounts of rain . Mawsynram, situated on the southern slopes of the Khasi Hills in Meghalaya, India, is one of the wettest places on Earth . After the arrival at the Eastern Himalayas, the winds turns towards the west, travelling over the Indo - Gangetic Plain at a rate of roughly 1--2 weeks per state, pouring rain all along its way . June 1 is regarded as the date of onset of the monsoon in India, as indicated by the arrival of the monsoon in the southernmost state of Kerala . </P>

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