Jetson Nano Dev-Kit environmental (storage and operation) temperature is specified with 0 to 50°C, while the production module is specified with -25 to 97°C.
You are obviously using jetson-stats/jtop. Did you try to manually increase the fan speed to 100%?
You may also try to switch to 5W power mode, but that will come with the cost of reduced performance.
p.s.: Dev-Kit is not specified for production use - but you probably know that already.