Residents across Delhi-NCR can expect a wet start to the week as the India Meteorological Department (IMD) has forecast light to moderate rainfall over several parts of the National Capital Region on Monday, July 27.According to the latest forecast, rain is likely in South West Delhi, New Delhi, West Delhi and South Delhi, along with neighbouring cities including Noida, Greater Noida and Ghaziabad. Cloudy skies and intermittent showers are expected to bring some respite from humid conditions.IMD predicts rain for Delhi and NCR todayThe IMD has indicated that several areas of Delhi-NCR could witness light to moderate rainfall accompanied by cloudy skies on Monday.The forecast covers:New DelhiSouth West DelhiWest DelhiSouth DelhiNoidaGreater NoidaGhaziabadThe showers are expected to improve weather conditions and may lead to brief waterlogging in low-lying areas during periods of heavier rain.Delhi monsoon rainfall remains below normalDespite spells of rain in recent weeks, Delhi continues to record below-normal rainfall this monsoon season.Between June 1 and July 25, the national capital received 247.8 mm of rainfall against the seasonal normal of 365.3 mm.This translates to a 14% rainfall deficit so far during the ongoing monsoon season.However, the IMD continues to classify Delhi under the 'normal' rainfall category.How does IMD classify rainfall?The IMD classifies seasonal rainfall into different categories based on the departure from the long-period average:Deficit: More than 19% below normalNormal: Between -19% and +19%Excess: Between 20% and 59% above normalLarge excess: 60% or more above normalSince Delhi's rainfall departure currently stands at 14% below normal, it remains within the IMD's 'normal' category.Delhi air quality remains satisfactoryAlongside the improved weather conditions, Delhi's air quality has remained stable. The city's Air Quality Index (AQI) was recorded at 80, placing it in the 'satisfactory' category.The combination of rainfall and favourable meteorological conditions has helped keep pollution levels under control across the capital.Rain expected to bring relief from humid weatherWith rain likely across Delhi, Noida, Greater Noida and Ghaziabad on Monday, residents can expect relatively cooler conditions compared with recent days. However, commuters are advised to plan their journeys accordingly, as intermittent showers could affect traffic during peak hours.