"Summer weather" refers to the conditions, such as warmth, sunshine, and often higher temperatures, that are typically experienced during the summer season.
It's lightweight so seasonally it can work in hot summer weather, but the the colors are perfect for fall. (ladyinviolet.com)
Light weight good for spring and summer weather in the south. (chadwicks.com)
These are warmer than 1 season bags and are the most common sleeping bag sold, ideal for summer weather as well as warmer nights during late spring and early autumn. (feedspot.com)