I havae a Showers Pass Transit rain jacket, well made, fits me well and does a good job of being a rain jacket and has smart vents and whatnot so that it is not too clammy. It is cheaper than the 2.1 but heavier. When I looked for a new rain jacket, the transit here is $315, the Transit $225. As I use a jacket much more commuting, in all kinds of temps, I chose the heavier yet least expensive of the two, thinking it would be tougher. I sometimes regret that (only from the weight aspect) but was hesitant spending that much more at the time for the 2.1

there are all kinds of lighter more compact rain jackets out there, and I would say that if for use primarily in the summer, a cheaper lighter jacket will do the job also.

I would add that rain pants and rain booties are always part of my rain kit, I personally dont like getting totally soaked, and my shoes too, so I carry these two things along with a rain jacket. Again, in hot summer its perhaps less of an issue, but having been on trips getting all wet, wet shoes etc, I prefer to have all three with me.

you'll have to decide how much you want to spend. There is a company from Oregon that makes inexpensive, simple rain jackets and pants, cant recall name, but biking stuff made simply and reasonable prices, look into it.