If you have hyperhidrosis, some cities and their climate are more likely to worsen your condition. That's because their weather tends to be hot and humid. Both these factors play a role in how much you might sweat and how fast the perspiration leaves the surface of your body. Keep in mind the following two physical properties and you will understand what I mean.
One of the laws of physics is that heat flows from warmer to colder areas. Sounds obvious but when your body warms up (say from physical activity) you will sweat more in a warm area because your body is having more difficulty cooling down. In a colder environment, your body heat will be tranferred more easily to its cooler surroundings.