The heat didn't bother Castiel in the slightest. He was even going as far as wearing is normal trench coat while at the park. Neither the heat nor the cold bothered the angel much, so he found it unnecessary to change his preferred clothing just because everyone else was affected by the weather.
He had decided to visit the park that day because he knew he couldn't spend every moment with Blake or the Winchesters. He had a job, yes, but this afternoon happened to be one of his days off. So, instead of spending it cooped up in the house he shared with Sam Winchester, he decided to spend it outside.
Castiel found himself wandering throughout the park, pausing at the pavilion. He spotted a woman with a small child, and smiled slightly to himself. He didn't have any children of his own, but he found them fascinating.
"Hello," he offered, once he was in earshot of the woman.