Summer is often associated with outdoor activities, vacations, and warmer temperatures that can help loosen stiff joints. Yet for many women, the season brings an unexpected problem: worsening joint pain. If you’ve ever noticed your knees, hips, hands, or shoulders feeling more swollen or achy during a heatwave, you’re not imagining it. Doctors say several factors linked to summer weather can contribute to increased discomfort, particularly for women living with arthritis, autoimmune conditions, or chronic inflammation. Understanding why summer joint pain occurs can help you take steps to stay active and comfortable throughout the season.