Rainy Week For Bengaluru: Moderate To Heavy Showers Mid-Week Onwards
The month of October is the second rainiest month for the tech city of Bengaluru. However, the rains have been mild so far in the first week of the month. The capital city has recorded 16.6mm in the first six days of the month. Historically, Bengaluru has received fairly above-normal rainfall in October during the decade 2010–2020. The city received 343.8mm of rainfall in 2014 and 385.7mm in 2017. Accordingly, the normal rainfall for the city has gone up to 186.4mm, based on data between 1991 and 2020. Earlier, the normal rainfall based on data from 1981 to 2010 was 168.3mm. The average rainfall for October between 2021 and 2024 has also been above normal. The Air Force Station Yelahanka, on the outer periphery of the city, recorded a massive 157mm of rainfall in 24 hours last year.
Bengaluru city recorded just 7mm of rainfall in the past 24 hours. Daily rainfall is likely to increase gradually, and the intensity will pick up as the week progresses. Moderate to heavy showers are likely between 8th and 12th October 2025. The city may receive nearly 100mm of rainfall during the upcoming wet spell.
There is a cyclonic circulation off the Tamil Nadu coast in the southwest Bay of Bengal (BoB). Also, a trough is extending from coastal Andhra Pradesh to the Comorin region, across Rayalaseema and South Interior Karnataka. Additionally, a cyclonic circulation is likely to form over North BoB on 8th October and persist for the next few days. A trough will extend from this system along the East Coast up to North Tamil Nadu. A feeble circulation is likely to develop off and along South Coastal Karnataka and North Kerala. Under the combined influence of these multiple systems, rainfall activity will strengthen over South Coastal Andhra Pradesh, North Tamil Nadu, Rayalaseema, South Interior Karnataka, Kerala, and South Coastal Karnataka. This will cover the capital city, Bengaluru, as well.
Such a change in the weather pattern is quite common prior to the onset of the Northeast Monsoon over the South Peninsula. This is taken as an early sign and precursor to the ushering in of post-monsoon rains over South India. Since the Southwest Monsoon is yet to complete its withdrawal from the country, the arrival of the Northeast Monsoon cannot be announced. As such, the onset of the monsoon is not expected before 15th October. Last year, the Northeast Monsoon had arrived on 15th October with a bang and coincided with the completion of the withdrawal of the Southwest Monsoon from the entire country.
