05 October,2026 10:28 AM IST | Mumbai | mid-day online correspondent
Pollution levels have started to rise in October. File Pic
Mumbai is set for a hot and humid start to October, with the India Meteorological Department (IMD) issuing a yellow alert for Mumbai and Thane, warning of hot and humid conditions in isolated pockets on Monday, October 5.
The IMD has forecast mainly clear skies in Mumbai and its suburbs, with maximum and minimum temperatures likely to remain around 36 degrees Celsius and 25 degrees Celsius, respectively.
After September saw relatively good air quality in Mumbai, with the Air Quality Index (AQI) remaining below 50 for most of the month, pollution levels have started to rise in October.
Mumbai's AQI stood at 89 on Monday, according to the Central Pollution Control Board's (CPCB) SAMEER app. The air quality falls in the âsatisfactory' category, which can cause minor breathing discomfort to sensitive people.
Air quality was worse in several parts of the Mumbai Metropolitan Region (MMR). Thane recorded an AQI of 95, while Kalyan stood at 110 and Navi Mumbai at 99.
The heat alert is not limited to Mumbai and Thane. Palghar, Raigad and Ratnagiri are also under a yellow alert, with hot and humid conditions expected across parts of Maharashtra's Konkan belt.
Meanwhile, temperatures remained high across Maharashtra, with Malegaon recording the state's highest maximum temperature of 38.2 degrees Celsius on Monday, which was 5.7 degrees above normal.
Solapur recorded 36.4 degrees Celsius, while Mumbai's Santacruz Observatory recorded 36.1 degrees Celsius and Aurangabad 36.0 degrees Celsius.
Ratnagiri recorded 35.5 degrees Celsius, Parbhani 35.3 degrees Celsius, Dahanu 35.1 degrees Celsius, and Nashik and Jeur 35.0 degrees Celsius each.
Harnai recorded 34.6 degrees Celsius, Satara 34.5 degrees Celsius, Mumbai's Colaba Observatory 34.4 degrees Celsius, Udgir 34.0 degrees Celsius, Sangli 33.3 degrees Celsius, Osmanabad 33.1 degrees Celsius and Kolhapur 32.5 degrees Celsius. Mahabaleshwar was the coolest at 27.9 degrees Celsius.
Maximum temperatures were above normal at all stations where departures were available. The largest positive departures were recorded at Malegaon (5.7 degrees Celsius), Ratnagiri (4.7 degrees Celsius), Aurangabad (4.2 degrees Celsius) and Harnai (4.0 degrees Celsius).
While daytime temperatures remained high, several parts of Maharashtra recorded relatively cooler nights.
Jalgaon recorded the lowest minimum temperature at 17.3 degrees Celsius, which was 4.0 degrees below normal. Udgir recorded 17.8 degrees Celsius, while Malegaon stood at 18.6 degrees Celsius and Mahabaleshwar at 18.8 degrees Celsius.
Beed recorded 20.0 degrees Celsius, Parbhani 19.3 degrees Celsius and Nashik 19.5 degrees Celsius. Dahanu's minimum of 22.4 degrees Celsius was 2.6 degrees below normal.
Colaba Observatory recorded the warmest night at 26.5 degrees Celsius, which was 1.2 degrees above normal, while Harnai recorded 25.0 degrees Celsius. Santacruz Observatory recorded a minimum of 24.2 degrees Celsius, 0.5 degrees below normal.
Maharashtra recorded no rainfall at any of the reporting stations in the 24 hours ending 8:30 am on Monday, according to the IMD's 8:30 am weather report.
The largely dry conditions, combined with above-normal daytime temperatures, have contributed to the hot and humid conditions being experienced across parts of the state.
At 8:30 am, relative humidity was highest at Malegaon at 96 per cent, followed by Dahanu at 86 per cent and Mumbai island city at 85 per cent.
Udgir recorded the lowest morning humidity at 56 per cent, followed by Aurangabad at 59 per cent.
On October 4 at 5:30 pm, humidity was lowest in Nashik at 38 per cent, followed by Aurangabad at 39 per cent, while Jeur and Udgir recorded 42 per cent each. Mahabaleshwar and Malegaon recorded the highest evening humidity at 73 per cent and 72 per cent, respectively.
