New Delhi in May

October through March gives you Delhi at its most pleasant—clear skies, manageable heat, and festivals lighting up the calendar. November and December are perfect, with temperatures hovering around 20-25°C during the day. January gets chilly at night (down to 5°C), so pack layers. February brings spring flowers to Lodhi Gardens and comfortable walking weather. But avoid April through September unless you enjoy feeling like you're inside an oven. May hits 45°C regularly, and monsoon season (July-September) turns the city into a humid mess. Here's the trade-off: winter months mean higher hotel prices and crowded attractions, but you'll actually want to explore the city instead of hiding in air conditioning. Book accommodation early for December and January—Delhi's wedding season drives up demand.