An incoming western disturbance parked on Wednesday evening over north Pakistan is expected to move east to impact weather in the western Himalayan region and adjoining plains until early next week.
An India Meteorological Department (IMD) outlook has maintained a watch for welcome showers or thundershowers to break out over Punjab.
The cooler western disturbance would now be able to smother the emerging spike in mercury tending to grow from the southwest for the time being.
The IMD has said that a gradual rise in maximum and minimum temperatures is likely over many parts of the country over the next three days.
Northwest India could be the sole exception to this trend thanks to the calming influence of the western disturbance.
Heat wave conditions would prevail over isolated pockets of west Rajasthan and Gujarat during this period.
Minimum temperatures were above normal by 2 to 5 deg Celsius over parts of Rajasthan and Gujarat and by 2 to 4 deg C over parts of Punjab and west Uttar Pradesh during the 24 hours ending on Wednesday evening.
But they were below normal by 2 to 4 deg Celsius over parts of the Northeastern States, Gangetic West Bengal, Orissa, Chhattisgarh and Vidarbha.
This is attributed mainly to the presence of the trough in the lower levels of the atmosphere running down from north Orissa to west-central Bay of Bengal.
Though shifting alignment almost on a daily basis over the past week or so, the trough has been persisting in the region, and with it associated clouding and thundershowers.
The lowest minimum temperature of 11.6 deg Celsius was recorded at Adampur in Punjab.
Satellite pictures showed presence of convective clouds over parts of north Jammu and Kashmir and southwest Bay of Bengal.
The upper air cyclonic circulation over southwest Bay of Bengal and adjoining Sri Lanka too persisted.
Widespread rainfall was reported from Andaman and Nicobar Islands while it was isolated over Orissa and Coastal Andhra Pradesh.
A short-term forecast said that widespread rain or thundershowers would occur over Andaman and Nicobar Islands until Thursday evening.
Isolated rain or snowfall would unfold over western Himalayan region and increase thereafter during this period.
Scattered rain or thundershowers has been forecast over sub-Himalayan West Bengal, Sikkim and the Northeastern States from Thursday onwards.
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