The short answer is: it's not recommended, even under a covered awning. While the awning provides shade and some protection from direct rain, it does not create a fully controlled indoor environment. Regular indoor cushions are typically made from fabrics like cotton, linen, or velvet, which are not designed to withstand moisture, mold, mildew, or UV exposure.
A covered awning still exposes furniture to high humidity, morning dew, wind-blown rain, dust, pollen, and indirect sunlight. Indoor cushion fills, such as standard polyester fiber or down, will trap moisture and take a very long time to dry, leading to clumping, mold growth, and unpleasant odors. The fabrics will also fade and degrade faster outdoors.
For a protected yet semi-outdoor space like a covered patio, the best solution is to use cushions specifically designed for outdoor use. These are crafted from solution-dyed, water-resistant fabrics like acrylic or polyester, with quick-drying foam fills. They are engineered to resist moisture, mildew, and fading. If you must use indoor cushions temporarily, be vigilant: bring them inside immediately after use, during high humidity, or any forecast of rain. Consider using a waterproof cushion cover as an essential protective barrier. Ultimately, investing in proper outdoor cushions will ensure longevity, comfort, and a cleaner, healthier seating area for your urban outdoor oasis.