 Mosquitoes love warm weather, so over time we're starting to see dengue spread in mosquitoes more northward. The most common symptoms are fever, nausea, vomiting, and a rash. They begin within two weeks and last two to seven days. Meanwhile, pest control companies are on overdrive, with calls up 30% in some areas due to bugs and rodents trying to beat the heat. Just like we don't want to be outside in the heat, neither does anything else.