Rabbits are very sensitive to heat and can suffer from heatstroke if temperatures get too high. The ideal temperature range for outdoor rabbits is between 12°C and 21°C (54°F and 70°F). Most rabbits can tolerate temperatures up to about 25°C (77°F), but anything above this increases their risk of heat- related illness

. Temperatures above 25°C (77°F) are considered too hot for rabbits and can lead to heatstroke, especially if the heat is prolonged. Some sources note that temperatures over 29°C (85°F) are particularly dangerous and can easily cause heatstroke in rabbits

. When temperatures exceed 30°C (86°F), rabbits struggle to regulate their body temperature, and above 35°C (95°F), they cannot maintain their body temperature and can develop severe heatstroke

. Rabbits do not sweat and cool themselves mainly through blood flow in their ears and by breathing, so they need shade, ventilation, fresh water, and cool surfaces to lie on during hot weather

. Signs of heatstroke in rabbits include:

• Hot ears
• Lethargy and weakness
• Rapid or shallow breathing
• Limp tail
• Wetness around the nose
• Stretching out fully
• Seizures or collapse in severe cases

If you suspect heatstroke, move the rabbit to a cool place, mist their ears with cool water, and provide fresh water. Immediate veterinary care is essential. Summary:

• Ideal temperature: 12–21°C (54–70°F)
• Maximum safe temperature: up to 25°C (77°F)
• Above 25°C (77°F): increased risk of heatstroke
• Above 29°C (85°F): dangerous, heatstroke likely
• Above 35°C (95°F): rabbits cannot regulate temperature, severe risk

To protect rabbits in hot weather, provide shade, ventilation, cool water, and avoid exposure to direct sunlight or high temperatures.