Sawan month or Shravan maas is the fifth Hindu month. As per the Hindu scriptures and Vedas, Shravan maas is considered as highly auspicious month. In Vedas, Sawan month is described as ‘Nabhas’. Shravan Purnima (the full moon day in Shravana masam) coincides with with the Nakshatra (birth star) of Lord Sri Maha Vishnu, Shravana nakshatra, hence the whole month is called as Shravana masam. This is the main reason why Shravan month is considered as important, significant and auspicious.
Among the seven days in a week, Somvar (Monday) is auspicious in Kartik month; Guruvar (Thursday) is auspicious in Margashirh month and Sunday in Magh maas. But in Shravan month three days in a week are most auspicious – Shravana Mangalvar (Tuesdays in Shravan month), Shravana Shukravar (Fridays in Shravan month) and Shravana Shanivar (Saturdays in Shravan month).
On Tuesdays in Shravan month, newly married brides observe Mangala Gauri Vrata which is performed to get rid of bad omens. On Fridays in Shravan month, married women observe Shravana Shukravar Vrat (Varalakshmi Vratam). On Saturdays in Shravan month, devotees worship Lord Sri Maha Vishnu, particularly Lord Venkatesha (Lord Balaji).
In Sawan month, Vishnu and Lakshmi aradhana (worshipping Lord Vishnu and Goddess Laxmi) is highly meritorious.