Looks like sunburn to me.
If the leaves are dry, you need to check the soil moisture within the pot. You should keep the soil moist. You can test it by sticking your index finger down into the soil to feel how moist or dry it is a couple of inches down. If the pot is drying out too fast, you can water it more often, or position it where it will get less sun (but less sun can affect blooms).
Pots can dry out fast, depending on what they are made of, how many drainage holes they have, how large those holes are, and how large the pot is in comparison with the rose's root mass. For example, unglazed clay pots, such as those made of terra cotta, can dry out fast because they wick the moisture away from the inside to the outside of the pot. Glazed pots and plastic pots will not dry out as fast. Roses often need a larger pot than some people imagine.
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