A foggy Saturday morning in the national capital led to the delay of 27 trains.The Met Office has forecast a cloudy day ahead."The sky will remain partly cloudy throughout the day. The maximum temperature is likely to hover around 19 degrees Celsius," said an official of the India Meteorological Department.According to Northern Railway, 27 trains were running late and three trains were cancelled.The visibility at 8.30 a.m. was 200 metres and humidity was 97 percent.Friday's maximum temperature was 19.8 degrees Celsius, a notch below the season's average and the minimum temperature was 11.4 degrees Celsius, four notches above the season's average.