Sally Holmes here is susceptible to blackspot but even moreso to Cercospora spot. You could go to Lowe's and get Bayer Advanced Garden Rose & Flower Disease Control containing only tebuconazole (not any of the Bayer combination products). Spray this once a week with a tank sprayer for two or three weeks. It will stop the disease from spreading, but leaves will continue to die for a week or two. Every other week is often enough except while the disease is galloping. You can skip it altogether during very hot or dry weather. Next spring, if you expect similar weather to what you're having, you should spray preventatively.

Or, if you choose to do nothing, the plant will survive in your climate.

Keep in mind that nothing you spray now will get rid of the existing spots, and note (as Michael says) that the affected leaves can't be saved.
You CAN stop the disease from spreading.

I didn't know Sally had that problem -- she's pretty clean, here in SoCal, poor girl.

Jeri

I have 2 climbing SH here in north LA. Mine do get bs or maybe it's cercospora. I just leave 'em alone and keep them fertilized with alfalfa. They continue to bloom. They recover fine and are GORGEOUS in the fall.I had some dieback on both but they are putting up huge new basals.I don't spray anything in my garden b/c I love my birds, frogs and lizards. If a rose is too disease prone, out it goes b/c there are so many others to choose from.