The conversion

170°F = 76.67°C

°C = (°F − 32) × 5/9, so (170 − 32) × 5/9 = 76.67.

170 °F is well outside the range outdoor air occupies on Earth, so there is no useful weather description for it — this page is arithmetic rather than a forecast.

Convert something else

68°F

The range either side

Neighbouring values, for when the number you actually wanted was a degree or two away.

Fahrenheit to Celsius either side of 170 °F.
FahrenheitCelsius
165 °F73.89 °C
166 °F74.44 °C
167 °F75 °C
168 °F75.56 °C
169 °F76.11 °C
170 °F76.67 °C
171 °F77.22 °C
172 °F77.78 °C
173 °F78.33 °C
174 °F78.89 °C
175 °F79.44 °C

The other direction

76.67 °C converts back to 170 °F, which is the same relationship read the other way. Going from Celsius to Fahrenheit, multiply by 9/5 first and then add 32. Adding first is the usual mistake.

The full converter handles any value, in either direction, including kelvin, and shows the formula as it works.