Visiting local bars in Formosa is better when you know what the weather holds. These rainfall averages and temperatures can help you decide the best time for bar hopping. The hottest months are usually January and February with an average temp of 81°F, while the coldest months are July and June with an average of 64°F. The snowiest months in Formosa are May, January, February, and March, with each month seeing an average of 7 inches of snowfall.