Scheelite-type oxides of formulas NaLa_1−xDy_x(MO₄)₂ and Na₅La_1−xDy_x(MO₄)₄ (M = Mo, W) were investigated as thermosensitive phosphors in the 300–700 K temperature range. Phosphors were synthesized in the solid state and their thermometric responses were quantitatively interrogated using the luminescence intensity ratio approach. Temperature-dependent blue emissions from the thermally coupled levels ⁴I_15/2 (454 nm) and ⁴F_9/2 (484 nm) of Dy³⁺ were observed under steady-state ultraviolet excitation of the oxygen-to-metal charge-transfer state. The ratio between the integrated intensities of these emission bands was used as the thermometric parameter. Relative thermometric sensitivities were systematically mapped as a function of host composition and activator concentration. At 350 K, the highest relative sensitivity was observed for Na₅La_0.5Dy_0.5(WO₄)₄ (1.8 × 10⁻² K⁻¹), while at 700 K the sensitivity was maximum for NaDy(MoO₄)₂ (3.8 × 10⁻³ K⁻¹). Comparison of these values with those reported for other dysprosium-activated phosphors revealed the potential of scheelite-type oxides as optical sensors for intermediate temperatures (<1000 K).