We demonstrate the capability to simultaneous measure humidity and temperature using a PFBG and a Fabry-Perot cavity formed between the silica to POF connection. To have a strong silica to POF connection, it is common practice the fusion of the fiber terminals with an optical adhesive. In this work, the same approach was used. However, careful control of the distance between the fibers is chosen in order to create a Fabry-Perot cavity. By monitoring the spectral responses to temperature and humidity of the PFBG and FPI structures, it was possible the construction of the sensitivity matrix, which allows the simultaneous measurement of these two parameters.