By: Express News ServiceMumbai | Updated: September 27, 2025 01:51 PM IST 2 min readMumbai has already received 445 mm of rainfall this September, which is significantly higher than its typical monthly average of 380 mm. (Express Photo by Akash Patil)Mumbai and its neighbouring districts woke up to overcast skies and intermittent spells of heavy rainfall on Saturday, with more rain expected in the coming days. According to the India Meteorological Department (IMD), the region will experience heavy to very heavy showers over the festive weekend until Monday.In light of the heavy showers, the IMD has warned of a possibility of low-lying areas getting inundated, flash floods, and disruption to road, rail, air and ferry transport over the coming days.Data furnished by the weather bureau showed that amid a yellow alert sounded between Friday and Saturday morning, the Colaba station received 54 mm of rainfall while the Santacruz observatory received 12 mm.Records from the Brihanmumbai Municipal Corporation’s (BMC’s) automatic weather stations show that between 8.00 am on Friday and Saturday, the heaviest rain was recorded over the island city division at an average of 30.07 mm, followed by 26 mm of rainfall in the eastern suburbs and 10 mm average rainfall in the western suburbs.The IMD has said that rain activity is set to gather further pace, placing Mumbai and its neighbouring districts under an orange alert starting Saturday. While the orange alert, stating the possibility of very heavy rainfall in isolated pockets, has been sounded in Mumbai and Thane until Tuesday morning, Raigad district has been placed under a red alert on Sunday.Meteorologists have attributed the increase in rain activity across Maharashtra to a well-marked low-pressure area over the Bay of Bengal, which is likely to move west and concentrate into a depression over the next 12 hours.Furthermore, a trough is also persisting from the low-pressure area over the Bay of Bengal to the south Maharashtra coast. “Together, the combined effect of these systems is likely to usher in an enhancement in rainfall activity over Maharashtra between September 26-30,” an IMD scientist said.Story continues below this adMumbai has already received 445 mm of rainfall this September, which is significantly higher than its typical monthly average of 380 mm.Stay updated with the latest - Click here to follow us on Instagram© The Indian Express Pvt LtdTags:MaharashtraMumbai