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