And I would rethink the poncho. They make very lightweight very effective rain jackets that also look kinda nice for wearing around towns. Ponchos are good for backpacking but you will be walking around a lot of towns.
I wouldn't rethink the poncho!! Yes, you will be walking around towns, but not half as much as you'll be on the trail!!
To be fair, I'm not too worried about how I look - I care more about comfort and practicality.
I've worn both. In my personal opinion, poncho's are better. Especially the ones with proper arms - they're like a jacket , but with the added bonus of protection for your pack, (day pack when you are in town) and they hang down lower than a jacket, so in August you won't need rain pants too. The bottom of your shorts might get wet, but that's about it. Plus, once I'd practised a couple of times, I can pull it out of the side pocket of my pack and put it on without even stopping. And yes, I use poles. Don't know how I'd manage that in a sudden downpour with a jacket!
They also come in their own pouch - useful for dirty clothes, whilst the poncho stayed, easily accessible, in the side pocket...
I carried a long sleeved Merino, +light weight puffer, and used both. To be fair, on the Primitivo, so perhaps a little cooler. But July... I'm writing this in the train on the way home.