Parts of the national capital received light rain on Sunday evening with the maximum temperature settling at 40.7 degrees Celsius, normal for this time of the season.
The minimum and maximum temperature readings on Wednesday are likely to settle at 21 degrees Celsius and 38 degrees Celsius respectively with a mainly clear sky forecast, according to the IMD data.
According to the India Meteorological, the national capital may have a partly cloudy sky with very light rain or drizzle accompanied with gusty wind of 30-40 kmph towards afternoon and evening.
A slight increase in temperatures -- up to 41 degrees Celsius -- is predicted over the next three to four days, but there is no forecast of a heatwave for another week.
The thunderstorm accompanied with lightning and rain led to a drastic fall in the surface temperature on Monday. Between 5.40 am and 7 am, the temperature plummeted by 11 notches from 29 degrees Celsius to 18 degrees Celsius.
The India Meteorological Department (IMD) said the maximum will rise to 44 degrees Celsius on Thursday and hit the 45-degree Celsius mark by Friday.
An AQI between zero and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.
Back-to-back patchy rain, thunderstorms, and strong winds had provided some respite from the intense heat last week.
Delhi had witnessed a hot and dry March, gauging nil rainfall against the normal of 15.9 mm