A weather-resistant tent for outdoor yoga retreats in a place such as Bengaluru, Karnataka, India, must ensure protection from rain and sun, proper ventilation for comfort while practicing, and sufficient room for participants and possibly some gear. Here is a summary of features and considerations:

Key Features for a Weatherproof Yoga Retreat Tent:

Size and Capacity:
Establish the number of participants that the tent must comfortably accommodate for yoga practice. Take into consideration the space required for the yoga mats and movement.
Individual retreats or instructor tents require smaller options. Weatherproof Tent for Yoga Retreats Outdoors For group classes, larger group shelters or several individual tents may be required.
Great Weather Protection:
Waterproof Rating: A hydrostatic head (HH) rating of 2000mm or higher for the rainfly is needed to protect from unexpected showers, which are a common occurrence even outside the monsoon. For monsoon expeditions, it should be 3000mm or more. The floor rating should be greater (3000mm+).
UV Protection: The fabric of the tent must have a UPF (Ultraviolet Protection Factor) rating to protect participants from intense sun during daytime practice.
Wind Resistance: A secure design and robust poles (aluminum ideal) are crucial to resist windy weather, particularly in exposed locations.
Full Coverage: A rainfly that covers the tent body sufficiently offers greater rain and sun protection.
Superior Ventilation:
Large Mesh Windows and Doors: Optimize ventilation to keep the interior cool and comfortable for practicing yoga, particularly in hot and humid environments. Multiple openings are useful for cross-ventilation.
Roof Vents: High vents allow for the release of hot air that rises, further enhancing airflow.
Roll-Up Walls or Panels: Some larger shelters have the ability to roll up walls, giving an open-air experience yet still having the shelter for shade and possible rapid closure if rain sets in.
Durability:
Quality Materials: Use long-lasting fabrics (ripstop nylon or polyester) and sturdy poles capable of repeated use and varied weather.
Strong Zippers: Trustworthy zippers are essential for windows and doors that will be frequently opened and closed.
Ease of Setup and Take-Down:
Think about setup and take-down frequency. More straightforward designs will be easier to use for retreats that travel or are installed and removed repeatedly.
Portability and Weight (if frequent relocation):
If moving the tent regularly is part of the retreat, weight and packed size will become significant considerations.
Floor Type
Integrated Floor: Provides maximum protection against ground moisture and insects.
Optional Footprint: Having a footprint under a tent with an integrated floor provides additional protection and lengthens the lifespan of the tent.
Open-Sided Shelters: In dry seasons or where the ground is well-drained, open-sided canopies or shelters may be adequate, giving priority to shade and ventilation.
Color:
Lighter shades can reflect sunlight and maintain the interior cooler. Natural colors can integrate more harmoniously with outdoor environments.
Recommended Types of Tents:

Large Dome Tents: Provide adequate headroom and floor area, with possibilities for great ventilation through several windows and doors. Search for models with high waterproof and UV ratings.
Cabin Tents: Offer greater vertical walls and a larger interior, which may be comfortable for longer stays and mobility. Opt for those that have good air circulation and good weather protection.  
Group Shelters/Canopies with Sidewalls: For larger numbers, a huge canopy with zipper-on sidewalls can provide an adaptable area for yoga. Use the sidewalls for rain or sun shielding or roll up to provide open breeze circulation.
Bell Tents: Provide a unique look and good-sized interior space with adequate ventilation possibilities (top vents and roll-up sides). Select those produced with waterproof, UV-resistant canvas or poly-cotton.
Yurt-Style Tents: Give a vast, open room with adequate headroom and may be very strong. Opt for weatherproof varieties with adequate ventilation.
Specific Tent Considerations in Bengaluru's Climate:

Pre-Monsoon (March-May): Prioritize good ventilation and protection from the sun's harmful rays.
Monsoon (June-October): Use high waterpoof ratings and good ventilation to deal with humidity.
Post-Monsoon/Winter (November-February): Although normally drier and colder, good weather protection from surprise showers remains useful.
Choices (Indian availability uncertain):

Coleman WeatherMaster Series: Good weather resistance and roominess.
Ozark Trail Cabin Tents: Provide ample spaces and reasonable weather protection at a slightly more affordable price.
Quechua (by Decathlon) Big Camping Tents: Mostly provide good value and reasonable waterproofing, and there are multiple sizes to choose from.
Local Indian Brands (Research Carefully): Look up Indian outdoor gear manufacturers for large, weatherproof tents or shelters that can be used for group activities. See reviews for their performance in local weather.
Specialized Event Tents or Canopies: For bigger retreats, look for companies that provide event tents and focus on those with waterproof and UV-resistant features that are well-ventilated.
Final Thoughts:

Your perfect tent will vary with the size of your yoga retreats, how often it will be set up, and the actual weather conditions you expect. Make a balance your top priority between roominess, great ventilation, strong protection from the weather (particularly waterproofing and UV resistance), and longevity. Carefully reading reviews from people who have actually used the tent under similar climatic and usage conditions will be invaluable in your decision-making process.

Sources and related content