Fortunately, where I am out West, I don't have to deal with rain very often in the summer. I've got the rain gear down to an art. I have a thin waterproof jacket and pants I bought from BMW many years ago, and I can get the jacket on and off in a couple of minutes. The rain pants I just leave on between showers and they don't seem to matter too much. They are still totally waterproof after about two decades of use. That old BMW branded stuff was really good value as it lasts for years.
The GORETEX gear I have personally tried doesn't seem to flow enough air for the 100°F+ days. I'm from England originally, so I'm used to riding in perpetual rain, especially in winter, but heat in my upper body really gets to me.
My boots are leather and GORETEX lined Georgia Boot Company boots with the carbon fiber toe protectors. I like them on and off the bike, but they are not totally waterproof in continuous driving rain on a bike, unlike off the bike, where they work well. Hence, I have the disposable boot covers for when it's going to rain for more than say an hour. They are waterproof up to a point, but eventually give up to driving rain. I'll need a new pair soon, so it might be just because mine are getting on for at least six years old now.
For Pants, I use Kevlar re-enforced jeans, my jacket is a new KLIM Induction Pro, which is a huge improvement over the old regular Induction jacket I've had for years. For colder weather, I have an old BMW adventure jacket and pants, or a Triumph brand really heavy leather jacket, both of which I've probably had for over twenty years. If it's really cold, on go the level 4 thermals as well.
Gloves, I finally wore out my favorite BMW GS gloves after 20+ years of riding. They were brilliant gloves. They don't make them anymore and I looked around, but they go for silly money on E-Bay. So I bought a new pair of Alpinestars Stella SMX-1 Air v2, actually in women's XXL, as they fit my wider hands but shorter fingers. All the men's gloves these days are too long in the finger once they are actually big enough to get my hands in. These work OK in the heat, despite being mostly ventilated leather, my hands don't seem to be a problem. If it's really raining, I have an old pair of waterproof Triumph branded gloves that still work well and the wrists tuck easily under my rain jacket.
What I did buy from Amazon was:
Neck CoolingTube, Reusable Ice Cooler Wearable Body CoolingProducts, Neck Coolers for Hot Weather
And:
Alphacool Frosty Body Cooling Ice Vest
The former is for shorter rides on hot days, the latter is for long trips. The inserts re-freeze overnight in the freezer part of a hotel room's refrigerator.
If you know of any GORETEX gear that flows a lot of air, I'd be pleased to know, as I'm pretty heat sensitive here in the high deserts of the West.