To convert Fahrenheit to Celsius, you can use the formula:
\[ C = \frac{(F - 32) \times 5}{9} \]
For 80° F:
\[ C = \frac{(80 - 32) \times 5}{9} \] \[ C = \frac{48 \times 5}{9} \] \[ C = \frac{240}{9} \] \[ C \approx 26.67 \]
So, 80° F is approximately 26.67° C.