  The effect of thermal fluctuation on the spin-chirality-induced anomalous
Hall effect in itinerant magnets is theoretically studied. Considering a
triangular-lattice model as an example, we find that a multiple-spin scattering
induced by the fluctuating spins increases the Hall conductivity at a finite
temperature. The temperature dependence of anomalous Hall conductivity is
evaluated by a combination of an unbiased Monte Carlo simulation and a
perturbation theory. Our results show that the Hall conductivity can increase
up to $10^3$ times the ground state value; we discuss that this is a
consequence of a skew scattering contribution. This enhancement shows the
thermal fluctuation significantly affects the spin-chirality-related Hall
effect. Our results are potentially relevant to the thermal enhancement of
anomalous Hall effect often seen in experiments.
