MUMBAI, Oct. 27 -- After a week of hot and sticky weather, a spell of steady rain on Sunday finally brought relief to Mumbai. The downpour, caused by a depression over the Arabian Sea, ended days of humid conditions and helped improve the city's air quality which worsened due to firecrackers. Since Sunday afternoon, several parts of the city witnessed continuous showers as predicted by the India Meteorological Department (IMD). The department has extended a yellow alert for Mumbai till Monday, warning of thunderstorms with lightning, light to moderate rain, and gusty winds of 30-40 kmph. In the 24 hours ending at 8.30 am on Sunday, the Santacruz observatory recorded 0.5 mm of rainfall, while Colaba logged 0.3 mm. By evening, the intensity of rain picked up, Santacruz recorded 6.6 mm and Colaba 16 mm between 8.30 am and 5.30 pm. According to data from the Brihanmumbai Municipal Corporation's (BMC) automatic weather stations, the highest rainfall between 5 pm and 7 pm on Sunday was reported at Byculla (35.6 mm), followed by Memonwala Fire Station (28.4 mm) and Grant Road (26 mm). In the suburbs, Bandra received 21.4 mm, while Mankhurd saw 15.4 mm of rainfall. The IMD attributed the showers to a depression that developed over the Arabian Sea and moved southwards, along with a trough and upper air cyclonic circulation stretching from the east and central Arabian Sea to southwest Gujarat and west Madhya Pradesh. These systems, the IMD said, are responsible for the unseasonal rain expected between October 26 and 30. The rainfall led to a noticeable drop in temperature. On Sunday, the maximum temperature was 31.3degC at Santacruz (2.9degC below normal) and 31.8degC at Colaba (1.9degC below normal). Minimum temperatures were 25.8degC and 26.2degC respectively. Over the coming week, the IMD has forecast day temperatures between 33degC and 34degC and night temperatures between 25degC and 26degC. The rain also brought an improvement in Mumbai's air quality. The city's Air Quality Index (AQI) was recorded at 54 on Sunda, in the 'satisfactory' category, following Saturday's 75. Earlier this week, the AQI had fluctuated between 'moderate' and 'poor', peaking at 211 on October 21. On Sunday, the state government issued an advisory warning fishermen against venturing into the sea for the next four days due to adverse weather conditions. The Meteorological Department has forecast strong winds along the west coast, triggered by a low-pressure system persisting until October 29, 2025. Wind speeds are expected to range between 35 and 45 kmph, with gusts reaching up to 55 kmph in some areas. The Indian Coast Guard and the Meteorological Department have urged fishermen to refrain from sailing during this period. The advisory further directs all fishing boats currently at sea to return to port immediately....