Summer Highland Retreat: Sauna Villa in Kitakaruizawa & Tsumagoi
Kitakaruizawa and Tsumagoi sit at 650-1,300m elevation—a highland summer retreat 5°C cooler than the city. THE FOREST SAUNA Kitakaruizawa lets you enjoy a barrel sauna and natural water bath in the lush forest, far from the summer heat.
Summer in Kitakaruizawa & Tsumagoi
June is rainy season. Between showers, the forest is vividly green. Humidity is high but elevation keeps it comfortable. July-August is full summer. While the city swelters, the highlands stay cool; nights can be chilly. Bring long sleeves for the temperature swing. Afternoon showers and thunderstorms are common—check the forecast before heading out.
Highland Retreat Sauna Experience
A highland sauna retreat in summer is a special luxury. The sauna→cold bath→outdoor cooling cycle feels exceptional in this season. The deck water bath offers open-air relief. Shade and cool air create a refreshing "totonoi" away from city heat. The HARVIA barrel sauna has an open window for forest views. No AC needed—high elevation keeps it naturally comfortable.
What to Wear & Bring
Short sleeves by day, but bring long sleeves and pants for evenings around 15°C. Towels, toothbrush, and other amenities are provided. Bring oil, seasonings, and laundry detergent. Insect repellent is useful in the forest. Sunscreen and a hat for strong UV at high elevation.
Access
Car access required. About 60 min from Joshinetsu Expressway "Usui-Karuizawa IC" via Route 146. Roads are stable in summer. Golden Week and Obon can be congested—plan extra time.
Nearby Summer Spots
Asama area: Onioshidashi Park, Asama Ranch for cool highland drives. Shiraito Falls is a 70m-wide waterfall popular for cooling off. THE FOREST SAUNA offers free BBQ equipment. Enjoy full BBQ in the summer forest with charcoal, fire starters, and tongs provided.