Summertime in Loch Lomond and the Trossachs is peak season and your best shot at good weather. You’ll also be able to adventure well into the night when the sun goes down after 10pm in June. Unfortunately, everyone has the same idea, so prepare for crowds. A late September or October visit is one of the most enjoyable times to visit the area, with crisp autumn weather and as much hope for a dry day as in July. Many campsites shut down from late October through March, so be sure to check for openings before you travel.