Hot flashes and night sweats can also be a side effect of breast cancer treatment, the National Cancer Institute reports.

Fixed-rate credit cards may help manage interest if you carry a budget over time. However, they may be harder to find than variable rate cards.

However, Knowlton said, everyone should take precautions on extremely hot days. "If you feel like you’re faint or dizzy or you feel sick, take it really seriously," she said.