The conversion

260°F = 126.67°C

°C = (°F − 32) × 5/9, so (260 − 32) × 5/9 = 126.67.

260 °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 260 °F.
FahrenheitCelsius
255 °F123.89 °C
256 °F124.44 °C
257 °F125 °C
258 °F125.56 °C
259 °F126.11 °C
260 °F126.67 °C
261 °F127.22 °C
262 °F127.78 °C
263 °F128.33 °C
264 °F128.89 °C
265 °F129.44 °C

The other direction

126.67 °C converts back to 260 °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.