In this work we have investigated the temperature-dependence of the band-edge photoluminescence decay of efficiently luminescing organically capped CdSe quantum dots QDs with diameters ranging from 1.7 to 6.3 nm over a broad temperature range 1.3– 300 K. The overall trend is similar for all the investigated sizes, consisting of different temperature regimes. The low-temperature regime below 50 K is characterized by purely radiative decay and can be modeled by a thermal distribution between a lower dark and a higher bright exciton state, with a size-dependent energy separation viz., from 0.7 to 1.7 meV and dark exciton lifetime viz., from 0.3 to 1.4 s for QDs ranging from 6.3 nm to 1.7 nm in diameter. Nonradiative relaxation processes become increasingly important above 50 K until the temperature antiquenching regime is reached, leading to a decrease in the nonradiative contributions and photoluminescence intensity recovery above 200 K.