Outdoor hydro is great if you prepare correctly. Where I live it gets up to 115 for days at a time. You've got to keep the res cool but you don't want a big difference in temperature when the system cycles. Continuous flow during light hours is good if you use a chiller full time otherwise the pump will heat the water and make things worst.
Pythium (root rot) is the big concern, I tend to deal with it in an aggressive preventive manner, 35% Hydrogen Peroxide in small doses will keep it at bay but will also kill off the beneficial bacteria, so use nutrients that are readily available to the plants.

DWC is a good low cost way to deal with the heat. I grew lettuce and tomatoes in a DWC bucket with styrofoam rafts, all the way through summer. The lettuce stretched because of the heat but it also puts off a natural chemical that helps prevent pythium. The tomatoes where amazing and had roots that where 4 feet long when I lifted the raft out of the water. The res would get up to 80-90 degrees during the day and evaporate the water like crazy, up to 5 gallons a day.

This is the ebb and flow system that I modeled my system after. But in 115 degree weather I've found drain to waste drip setups combined with an absorbent medium to be the better solution and it eliminates the cost of the control bucket.

Complete Multi Flow bucket systems at discount prices

These usually come with 2 gallon containers I wanted 5 gallon buckets so I made my own.
Here is where I got the control kit.
Ebb & Flow Control Kit

I purchased black 5 gallon premium buckets, the inserts, the fittings and tubing from a local source. I installed the kit in another 5 gallon bucket and purchased a large Brute garbage can for the res. It works very nice when used with expanded clay.

The price is about the same as a prebuilt setup but my DIY allows for much more versatility. You have to supply the pumps, timer and wiring. Check out the instructions before you buy the control kit if you question your ability to wire it yourself.
Hope this post wasn't excessively long, I could go into much greater detail but people would probably fall asleep reading it.

Outdoor hydro is the best of both worlds, free high intensity lighting, all the fresh air needed combined with the control and power of full hydroponic solutions. Your moving into the epithelial of plant culture.
Good luck :jointsmile: