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The short answer: late January to mid-March

If you can pick any dates, come between the last week of January and the middle of March. Daytime temperatures sit at a pleasant 20–28°C, mornings are crisp enough for a jacket, the worst of the winter fog has broken, and the air quality — while never good by international standards — is at its most tolerable of the cool season. Gardens are at their best: Lodhi Garden, Sunder Nursery and the Mughal Gardens at Rashtrapati Bhavan all peak with bougainvillea and roses in February, and the city's cultural calendar is dense with festivals and outdoor concerts.

The trade-off is that everyone else knows this too. Hotel rates through February hold near their annual peak, and anything well-reviewed under ₹6,000 a night in Connaught Place, Nizamuddin East or Hauz Khas needs booking six to eight weeks ahead. Monument queues at Humayun's Tomb and Qutub Minar are longest between 10:00 and 13:00. Buy tickets online, start at opening, and treat the middle of the day as lunch and market time rather than sightseeing time. Sunset comes early, around 18:15 in February, so plan rooftop drinks accordingly.

October and November: festival season with an asterisk

October is beautiful on paper. The monsoon has cleared, temperatures drop from the mid-thirties to the mid-twenties, and Durga Puja, Dussehra and Diwali land in quick succession, filling the city with marigold garlands, temporary bazaars and firework noise. The catch is air quality. From roughly 20 October to 25 November, stubble burning in Punjab and Haryana combines with Diwali fireworks and a temperature inversion to push Delhi's AQI into the 300–500 range for days at a time, and the city periodically shuts schools and construction sites.

This does not make November unvisitable, but it changes what you should plan. Sensitive travellers, asthmatics and anyone travelling with small children should either shift dates or come prepared with N95 masks and indoor-heavy itineraries: the National Museum, Crafts Museum, the Kiran Nadar Museum of Art in Saket and long lunches. Check aqicn.org or the SAFAR app before booking. Hotels rarely discount in November — it is peak wedding and conference season — so you can end up paying top rate for the worst air of the year, which is the least appealing bargain in Indian travel.

December and January: fog, flight delays, and the best light

Deep winter in Delhi is genuinely cold by subcontinental standards: 5–9°C at dawn, 16–22°C by afternoon, and no central heating in most buildings under ₹5,000 a night. Pack a proper jacket and check that your room has a working heater, because budget hotels in Paharganj and Karol Bagh often do not. In exchange you get extraordinary light — low sun through Humayun's Tomb's arches at 08:00 in January is the best photography Delhi offers — and cheap winter street food: gajar ka halwa, daulat ki chaat in Chandni Chowk, and roasted sweet potato from carts.

The recurring problem is fog. Between late December and mid-January, dense morning fog regularly cuts visibility at Indira Gandhi International below operational minimums, delaying or diverting flights and pushing back the Delhi–Agra and Delhi–Jaipur trains by two to five hours. Never schedule a tight connection or a same-day monument trip on a December or January morning. Book afternoon departures where you can, keep a day of slack around any onward flight, and treat the 06:00 Gatimaan Express to Agra as a plan that may not happen.

April to June: heat that reshapes the day

By mid-April Delhi is running at 38°C, and through May and June it sits between 41 and 46°C with dry loo winds that feel like a hairdryer. This is the season locals leave for the hills, and it is not a reason to cancel a trip that only works in June — but you must invert the schedule. Be at Qutub Minar or Red Fort by 07:00, back indoors by 11:00, and out again after 17:30. Carry two litres of water per person; a chilled 1-litre bottle costs ₹20 from any shop.

The compensation is money and space. Five-star rooms that command ₹18,000 in February trade at ₹8,000–₹11,000 in May; mid-range hotels in Karol Bagh drop to ₹2,200; monuments that are shoulder-to-shoulder in winter are nearly empty. If your priority is honest value and you are heat-tolerant, late April and early September are the two most underrated windows in the Delhi calendar. Choose accommodation with a pool and a genuinely functioning air conditioner, and confirm both before you book rather than after.

July to September: the monsoon and what it fixes

The monsoon usually reaches Delhi in the last days of June and runs to mid-September. It rarely rains all day — the pattern is heavy bursts of one to three hours, often late afternoon, separated by humid sunshine at 32–35°C. Roads flood predictably at underpasses along the Ring Road, Minto Bridge being the notorious one, and traffic can double in time. What the rain does deliver is a green city: Lodhi Garden, the Ridge forest and Sunder Nursery look extraordinary, and the air is cleaner than at any other point in the year.

Practical monsoon travel means the Metro over road transport, a lightweight rain shell rather than an umbrella you will lose, and shoes you do not mind soaking. Dengue and chikungunya rise from August into October, so use repellent at dusk and choose rooms with screens. Rates are at their annual floor and cancellation policies are flexible. If you are combining Delhi with Rajasthan or Agra, monsoon week can be superb: fewer crowds, dramatic skies, and cheap same-week train tickets on the Delhi–Agra Cantt corridor.

Dates to book around, and dates to avoid

Republic Day on 26 January is spectacular but logistically brutal: Kartavya Path and much of Lutyens Delhi close for rehearsals from around 17 January, security cordons snarl central traffic, and tickets for the parade sell through official channels weeks ahead. Independence Day on 15 August closes the area around Red Fort. Holi, in March, effectively shuts the city for a day — most restaurants and all markets close, taxis are scarce, and unless you have joined an organised party, staying near your hotel is the sensible plan.

Better dates to aim for: the India Art Fair in early February, Jahan-e-Khusrau's Sufi music evenings in late February or March, and the Sunder Nursery winter festival season. Thursday evenings at Nizamuddin Dargah bring qawwali year-round and are best in cool weather. If you want markets at full strength, avoid arriving on a Monday, when Sarojini Nagar, Lajpat Nagar and INA all close, or a Sunday, when Chandni Chowk's wholesale lanes and Khan Market shut down.

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