  We present numerical results for the $J_1$-$J_2$ Heisenberg model on a
triangular lattice at finite temperatures $T>0$. In contrast to unfrustrated
lattices we reach much lower $T \sim 0.15 J_1$. In static quantities the novel
feature is a quite sharp low-$T$ maximum in the specific heat. Dynamical spin
structure factor $S({\bf q},\omega)$ allows for the extraction of the effective
spin-wave energies $\omega_{\bf q}(T)$ and their damping $\gamma_{\bf q}(T)$.
While for $J_2=0$ our results are consistent with $T=0$ spin ordering, $J_2/J_1
\sim 0.1 $ induces additional frustration with a signature of spin liquid
ground state. In the latter case, results for spin-lattice relaxation rate
indicate in the low-$T$ accesible regime on $1/T_1 \propto T^{\alpha}$ with
$\alpha \geq 1$, as observed in recent spin-liquid materials on a triangular
lattice.
