First of all, frequency and wavelength are inversely proportional to each other. Hence, if frequency is affected, definitely, wavelength is affected. The formula for wavelength = λ = v/f where v is the velocity and f is the frequency of the wave.

In case of sound wave, temperature does not directly affect frequency. Hence, wave length is also not affected.

Temperature affects the speed of sound. Sound, is a form of kinetic energy. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly.