a) Current UAC in the axis over UP tends to move westwards on Friday 9th. Rainfall increase possible over Northern India (including Delhi NCR) on Saturday 10th, and shifting West into Rajasthan on Sunday 11th. 
Remaining moisture can produce sharp convective rains around NCR till 11th.

Moisture attraction from Arabian Sea will pull rains into Gujarat and stretching into Rajasthan on Monday 12th. Coastal Sindh may get some regional rains on 12th.
Interior Mah goes almost dry from Sunday 11th.
Rains may spread (decreased intensity) into Central Pakistan, Northern Pakistan on 13th. 
West coast remains "dull" compared to normal rains, next 5 days. 

b) Monday, 12th, a UAC/Low forms in the Northern Bay off Orissa coast. Moves inland and brings good rainfall to Orissa and adjoining regions to the West. An East coast trough can form on 13th, and bring good precipitation on 13th and 14th from UP down South to entire Eastern India upto AP and Northern TN. 
Western regions of Bengal included, but Kolkata "skirted". 
Thunder activity continues as System forms, and Stray thundercells continue drifting in Kolkata region as  trough forms.

Rains and Thundershowers can stretch into TN on Wednesday 14th. Good precipitation can occur in TN coast and interior on 14th and 15th August.
More on vagaries

Weather update around India at 7pm, satellite visible at 5:30pm

5:30pm, HEAVY rain over S,S-E,W.Uttarpradesh, N.Madhyapradesh, E,S-E.Rajasthan, N.Chatisgarh, Jharkhand, W,S-W.Bengal http://ow.ly/i/2PaPH 

#Chennai - 6:30pm, moderate rain seen S-W of Chengelpet near Vandavasi, at around 65 to 100km from city.

5:30pm, Showers seen over central,N-central Tamilnadu and over E.Punjab ... http://ow.ly/i/2PaPH

Malout - 6:15pm, "Today had some passing drizzles from West, after that it was HOT with clear skies"

Kolkata - 7:14pm, Today, so far 3 brief spell of rain, another one nearing city now.

12:30pm, Almost NO rain over W,S-W Coast of India

12:30pm, Almost NO rain seen all along S-W coast from N.Maharastra coast to S.tip of Tamilnadu.. http://ow.ly/i/2P4UR 

12:30pm, Widespread rain over coast,S,N.Odisha, Rain also over S,N.Chatisgarh, most of Bengal, S,E.Bihar, S.Jharkhand http://ow.ly/i/2P4UR

12:30pm, Showers seen over S,central,W,N-W.Uttarpradesh, E.Rajasthan, N.Madhyapradesh into Haryana, #Delhi.. http://ow.ly/i/2P4UR

RT @toidelhinews: Rain lashes Delhi for third consecutive day, causes traffic jams http://t.co/jTCYalqQQm 

Update for Chennai, Tamilnadu, Andhra, S.Karnataka

RT @shri611: The city wakes up to a rainy morning. #Chennai @weatherofindiapic.twitter.com/PEyfwTGjnQ (6:38am)

#Chennai - Polichalur zone got a heavy drizzle at around 6:30am.

#Chennai - 1pm, HOT and Humid, temperature around 34 C with humidity around 50%. "A chance of evening rain after 4pm"

#Bangalore - There's a good chance of evening mini shower after 4pm.

Till tomorrow morning, scattered moderate rain expected for S.Karnataka, central,N,N-E.Tamilnadu and N,N-E,S,central-coast.Andhra.