HLSESS - thanks for asking! Kitt E - thanks so much for answering so well!
Late June through September is lovely in the Pacific Northwest. We tend to make a few longer stops at special places on the mountain and the weather changes with elevation a bit (our trips tend to cover sea level to 6000'). In July, low temps might be in the mid-50's and high temps might hit 80 degrees (Fahrenheit). We like to spend time on foot so we tell people to bring sturdy shoes (tennis shoes or light hiking shoes) and layered clothing that you can add to or subtract from as the day goes on or the elevation changes.
Our trips are all-inclusive (breakfast, coffee, tea, snacks, lunch, local wine, etc) and our guides are professional educators that tailor days to the small groups we have. Maybe the biggest upside to an all-inclusive trip is that it means more time outside (no time waiting in line at a busy lunch canteen in the park). We're attempting to give travelers the best day possible in the field. Additionally, we're the only day tour operator currently permitted to walk beyond a mile of the road (due to Mt. Rainier's ecological importance & sensitivity). Other day trip operators are restricted to what are known as "road tours."
I hope that information helps! Please let me know if I can tell you more. We have a small team in the office if you'd like to give us a call - we love talking about travel in the Northwest.
Gratitude,
Danny, Evergreen Escapes