The Delhi-Agra-Jaipur region of India is very close in proximity to each other and hence endures almost similar weather conditions. Except, that Jaipur falls in the Rajasthani region and does have more exposure to the desert of Thar. 

In light of this geographic triangle that the three cities make, they experience summers, monsoons and winters together and show temperatures that are mostly similar. Rainfall may vary, as Jaipur receives lesser moisture and precipitation than Delhi and Agra. The long winter months from October to February and beginning of summer are the ideal time to visit the Golden Triangle. To know more about the weather in the Golden Triangle, read on!

May is the hottest summer month, with temperatures touching 45°C. It is dry heat that these regions experience and can lead to heat stroke, especially for foreigners who are not used to this heat. Most shops in smaller areas of Delhi, Jaipur and Agra close down in the afternoon because that is how hot it becomes. Some activity begins after sundown but is still not very pleasant. If you still do visit during this time, keep Electral water and other rehydrating agents handy. 

There are some festivals hosted during summer months, like the International Mango Festival in Talkatora Stadium, Delhi, where you get to see 500 types of mangoes and taste it too! Gangaur is also one very famous festival in Rajasthan and celebrated with pomp in Jaipur over 4 days. It falls anywhere between March and April and is a festival of love, fidelity and fertility, where women worship Shiv-Gauri (a god and goddess in Hindusim) by creating their idols from clay, going to the lake for daily rituals and praying. You will find yourself immersed in the four colours that make the four days of Gangaur - green, red, orange and pink. Lots of fairs and festivals are also held in Jaipur during this period. 

Hence April may still be a good time to visit. But the May-June period is best avoided when visiting the Golden Triangle.

Monsoon in Delhi-Agra picks up by June end-July and floods may be expected if it becomes torrential. Showers come in short bursts usually and temperatures are brought down, bringing relief to the North Indian belt. Taj Mahal is not at its best when viewed in pouring rains. This should be the only important reason to avoid visiting The Golden Triangle during monsoon months, i. e. June-September.

However, some of the major Indian festivals fall in this period. Since rains bring relief from the heat and flowers bloom, this season is given great importance for fesivals of love and fertility in Indian culture. Teej is celebrated in Jaipur, in true Rajasthani style, where married women pray, fast and dress up to please the gods in order to get the love of their husbands for the next seven births. This festival falls in September and is a major delight as the city dresses up in lights too. You can feel love in the air. Janmashtami, the birthday of Hindu God Lord Kirshna is also widely celebrated in Delhi and Agra. Human pyramids are formed to break earthen pots filled with milk and curd, reminsicing how Lord Krishna did it as a child. These activities make most roads look like a fair and parade-like atmosphere lights them up. This festival falls in August.

Winter months from October to February are the best time to visit the Golden Triangle, with average temperatures falling to 22-32°C. December-January are freezing months, not only in the city of Delhi but also in Jaipur. The sands of Thar heat up easily, but they also cool off to freezing temperatures. 

The Taj Mahal is best visited in the winter afternoons when the sun is warm in cold air and fog is settled, to give you the best view of this beautiful monument. Food in streets like Chandni Chowk is also well eaten and digested in the cool, dry winter air. There are also some major festivals like Diwali (October) and Holi (March) that give you a taste of Indian culture. Diwali is celebrated in remembrance of Lord Ram, who killed the demon king Ravan and brought his abducted wife home and becomes the biggest festival in India.