Hypothermia is a medical emergency that occurs when the rabbit's body loses heat faster than it can produce heat, causing a dangerously low body temperature. Rabbits can succumb to hypothermia within hours.
A rabbit's normal temperature range when measured rectally should be between 100-104°F or 38.5-40°C. Rabbit fur is very difficult to dry properly if they end up wet to the skin, and rabbits can easily get hypothermia if not dried properly after being bathed.
- Vetlexicon. Hypothermia - low body temperature [PDF]