Yes. You should be able to use run a portable generator in the rain or snow with the help of a generator tent. Make sure that the tent covers all the sensitive parts of the machine to avoid exposure to moisture. Tents are waterproof usually, and they shed off any water of snow that falls on it. However, you should be careful to understand the tent's limitations. Each tent comes with the maximum limitations that it can withstand. Most tents can handle winds of up to 70 mph, snow of 18 inches, and 12 inches of rain daily. If the weather conditions are worse than that, then the tent might not hold up against rain and snow.