This has been our hottest weather in four years. A good deal of my blooms are affected by this high heat and stifling humid. Not all are affected but enough for me to say yes.

yeah, cuz my Dick Clark looks like a completely different rose is attached to the bush....

Totally normal. Most of my roses do that every summer from early June till October when the temps finally drop into the lower 90s / upper 80s.

I'm not a rose expert, but what I don't get is why the hot temps cause the rose to look flattened out like a wild rose on a shrub?? I could understand where the rose turns colors (gets burnt looking). I could understand where the bloom doesn't last but overnight & is ready to deadhead the next day--but this weird flattened out rose when it is normally a multilayered normal bloom?

Buford, okay that makes sense. Whewwwwwwwwwww. Thanks!

Petal count per bloom goes down. Colors fade. Some yellows and light pinks can turn almost white. Flowers are smaller. Cluster bloomers have lower bud counts per cluster. Flowers age quickly. Fragrance is changed. Sometimes it is intensified by heat, but with extreme heat fragrance can also weaken. The nature of the fragrance is also changed, like for example, from normally honey sweet to musky...like it fermented in the heat.

Foliage is also often smaller due to heat.

All the above occurs due to heat (and also due to the intense sunlight that goes with heat).

St Patrick is a rose that likes heat

We've had very similar weather to Milwaukee and a lot of my roses have been small, oddly shaped and odd colors. It's the heat, and for me at least, no rain. Even though I've been watering like mad nothing replaces a good soaking rain and we haven't had anything like that since sometime in very early June. When it has rained we get like maybe .10 of an inch if that and those have been few and far between. The roses are really just sitting around waiting for fall and cooler temps...and so am I!

As Zack notes, there are some roses that do particularly well even in very hot weather. My St. Patrick did just have some gorgeous blooms. Also Julia Child has not been phased a bit by the heat and drought. My minis are also doing better than the HTs with lots of good looking blooms. If you're interested there is another thread about what roses are doing well in desert states right now. Check that out!

Heat tolerant roses

Thank goodness! My mystery pink hybrid tea has done the same thing. Fewer petals and the top of the petals look 'fried'. I understood the fried look but I didn't understand Why all of a sudden there were fewer petals on a normally 40 plus bloom. And I'm not even in the hot zone - western Washington.