The climate during the summer in Bikaner is very hot and humid. Also, dust storms and hot winds are prevalent. Evenings are cooler, but humidity is persistent throughout the day. If you visit Bikaner in summer, you should be well-prepared to keep yourself hydrated and to avoid sunstrokes. Wear light cotton clothing. Also, keep a headgear and sunscreen every time with you.
Winter brings a new life to Bikaner. In general, the temperature and atmosphere remain pleasant and lovely. Nights are quite cold. Thus, carry warm clothes. It might be hot in the afternoons. But the heat is mostly tolerable and days are perfect for sightseeing and other activities. It's surely not the ideal time to visit Bikaner.
Monsoon starts in July and ends in September. Monsoon does no major difference to the characteristic of the land as it is a hot desert area. The area will be still hot and humid. If it rains, the climate becomes pleasant but eventually turns out to be humid. This season is best to visit Bikaner only if you want to grab lucrative discounts and want to marvel the architectural wonders drenched in rain.