Which U.S. cities are really sweating it out this summer? The 2025 Summer Sweat Index reveals:
Miami has been crowned the sweatiest city in the U.S. this summer, according to the newly released Summer Sweat Index from MedicaDepot, a supplier of skin health and medical aesthetics products.
The index ranks 100 cities based on heat, humidity, outdoor activity, and cooling resources. With a Sweat Index Score of 93 — the highest in the country — Miami’s tropical climate and vibrant outdoor culture keep sweat a daily reality, from sunrise jogs to evening strolls along the beach.
“In Miami, sweat is part of every sunny day — whether you’re biking along the bay or dancing at a festival,” said Dr. Simone Hartley, dermatologist and skin health expert at MedicaDepot. “My simple advice? Rinse sweat away when you can, wear light clothes, and keep skin hydrated to feel fresh and comfortable in Miami’s tropical heat.”
Miami at a glance:
- Sweat Index Score: 93 (highest nationally)
- Average Summer Temp: 89°F
- Humidity: 75%
- Outdoor Activity Rate: 72%
Why sweat matters for skin health
Persistent sweat can weaken the skin barrier and lead to irritation, breakouts, and conditions like hyperhidrosis. Dermatologists in Miami see these challenges peak each summer — underscoring the need for smarter skin strategies in a city that never stops moving.
About the Summer Sweat Index
The index uses three key pillars to score each city:
- Weather Exposure – heat index, summer temps, humidity
- Sweat Factors – outdoor activity, sweat-related skin care search trends, commuter sweat exposure
- Cooling Resources – AC access, shade, public cooling options
Data sources include NOAA climate data, CDC activity insights, U.S. Census reports on cooling resources, and Google Trends search data — all standardized for national comparisons.
Read the full Summer Sweat Index
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