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May 2026 was the driest month Mumbai's seen in the last three years, but while bidding adieu, it gave Mumbaikars a tease of the long-awaited pre-monsoon showers. Neighbourhoods including BKC, Andheri, Santacruz, Ghatkopar, Powai, Chembur, Mankhurd and other parts received rainfall, taking May’s total average rainfall to 9mm.
In light of the rain, the India Meteorological Department (IMD) has issued warnings concerning the pre-monsoon weather activity for all of Maharashtra.
When will it rain in Mumbai?
As per the IMD's latest forecast, June 1 to June 4 are marked as 'very likely' to see rain showers in many parts of the state. Mumbai and Thane districts may even experience thunderstorms and gusty winds, accompanied by lightning and moderate rainfall. Wind speeds are likely to be far more noticeable in isolated spaces.
Should I brace for humidity?
May, overall, has been a heat chamber, with relative humidity rising post the pre-monsoon showers. During the pre-monsoon showers, it was up to 81% at Colaba observatory and 86% at Santacruz observatory. The maximum temperature ranged between 34.8°C to 35.8°C.
June’s first week is likely to be far more humid. According to Mumbai Rains, an X account which predicts weather patterns more accurately than IMD sometimes, 'moisture levels will be high in the coming days, so once it crosses the humidity saturation point, passing rain showers will come and go for Mumbai.'
That means, yes, it's going to be more sticky, and it will feel slightly more uncomfortable.
When should I expect the monsoon to hit?
The monsoon’s official arrival this year is said to be June 11, 2026.
Last year, Mumbai incidentally recorded the wettest May in 107 years, and the south-west monsoon had arrived by May 26, 2025.
But before we get there, we have to endure a little more heat and humidity. So keep that rain gear handy, and get ready to see Mumbaikars’ tour de force, aka the 'spirit of Mumbai'.