Best Time to Visit Delhi

• October to March: the main season. Cool, clear mornings, ideal for sightseeing; some December and January weeks bring heavy smog.
• April to June: very hot, often exceeding comfortable sightseeing temperatures by midday.
• July to September: the monsoon. Humid, with heavy rain spells, but green and quieter for those who can handle it.

Delhi's air quality worsens noticeably in late autumn and early winter, particularly November through January, when smog can affect visibility and outdoor comfort for stretches of days at a time. It is worth building this into expectations for a winter visit, and travellers with respiratory sensitivities should plan accordingly.

Diwali, usually in October or November, lights up the city, though it also brings its own air-quality spike from fireworks. Republic Day in January brings a major parade through the government quarter. Exact dates shift each year with the lunar calendar, so confirm them on your quote.