This work compares several methods for estimating high-resolution air temperatures in mountain areas. The case study of a small alpine valley (the Nant valley, canton of Vaud, Switzerland) is used. An interpolation of measurements at three meteorological stations is carried out by applying a weighted inverse distance method, coupled with an altitudinal correction. Different temperature estimation products are compared in order to assess the performance of interpolation methods: products from CHCLIM25 downscaling, as well as outputs from the ERA5 climate reanalysis. The influence of the use of monthly or annual altitudinal temperature lapse rates is tested. An in-situ measurement network using mini thermometers is also set up to estimate the influence of local site effects on temperatures. This work shows that the interpolation of temperatures from in situ measurements, coupled with a monthly temperature lapse rate, makes it possible to model the annual dynamics of temperatures well, however the representation of the effects of local sites can be refined.