Abstract: Deep-cut plateau canyons develop unique local convection patterns driven by strong thermal gradients between mountain ridges and valleys. To investigate these phenomena, we conducted synchronous long-term field measurements of wind speed and air temperature in a deep-cut canyon on the southern Qinghai-Tibet Plateau. By analyzing wind speed evolution patterns and their correlation with air temperature, we developed a systematic methodology to extract local winds from observational data and subsequently analyzed both mean and turbulence characteristics of these winds. The results revealed significant diurnal variations in local winds. The horizontal wind speed showed minima around 9:00 Beijing Time (BJT, UTC+8) and maxima around 16:30 BJT, while the prevailing wind direction exhibited two stable phases with abrupt transitions between them. The vertical airflow reached its maximum upward velocity around 16:30 BJT, while the maximum downward velocity occurred at approximately 20:30 BJT and persisted until 7:00 BJT the following day. The vertical wind speed predominantly ranged from −3 to 3 m/s, significantly exceeding the vertical component of typical valley wind circulation. This indicates more intense local winds in the deep-cut plateau canyon driven by thermal effects. Analysis of local wind turbulence characteristics indicates that both turbulence intensity and integral scale closely follow log-normal distributions. The turbulence intensity showed minima around 7:00 and maxima around 12:00 BJT, while the turbulence integral scale exhibited minima around 9:00 BJT and maxima around 16:30 BJT, which matched the horizontal wind speed evolution pattern. The power spectral density of fluctuating wind speed showed good agreement with the von Kármán spectrum. Furthermore, while the original spectral density displayed significant diurnal variations, the normalized spectral density exhibited remarkable stability throughout the diurnal cycle. The results of this study may provide a reference and basis for structural wind-resistance design in such areas, especially for infrastructure in deep-cut plateau canyon terrains.