The city of Mumbai only sees rains during the four month Monsoon period. A little bit of rainfall is observed during the Pre Monsoon season, that too during the fag end of May and a little during the withdrawal of the Southwest Monsoon.
As far as the month of March is concerned, rains are absent from the commercial capital of India. In fact, the monthly mean of Mumbai is at 0.1 mm, which means that the city almost does not see any rains whatsoever unless a freak weather around the region.
However, yesterday and today, the city of dreams has seen traces of rain and thunderstorm activities. This is because a Cyclonic Circulation has been over south west Madhya Pradesh and adjoining north Madhya Maharashtra. Along with this, a trough is extending from the Cyclonic Circulation to north Konkan and Goa, which has resulted in isolated rain over Mumbai along with some scattered rain over Madhya Maharashtra.
Isolated patches of rain may be seen today as well, however weather will clear by tomorrow.