Likely U R right..
Excess thyroid hormone
causing thyrotoxic crisis, aka thyroid storm, can cause elevation
of body temperature in excess of 104, so chronic hyperthyroidism
is likely to elevate your body temperature a bit.
Your body is basically revved up 24/7 thus producing extra heat, hence the temperature. Please consult doc to get treatment as untreated can cause problems for you. Good luck.