40 °C to °F
40 °C = 104 °F
40 degrees Celsius is 104 °F. In Kelvin that is 313.15 K. At or above 38 °C, which the NHS and Mayo Clinic describe as a fever in adults. As air temperature, this is a dangerous heatwave.
The working
°F = °C × 9/5 + 32
- 40 × 9/5 = 72
- 72 + 32 = 104
Convert a different value
°C
°F
K
°R