The objective off this job is the design and development of a wireless low power weather station for installation in a marina. To do this, we will use the features of the latest microcontrollers from Microchip that have the XLP (Extreme Low Power) technology that reduces power consumption when the system goes into Sleep mode. The programming language will be C and using the programming style FSM (Finite State Machine) that makes the most efficient, easier to debug and helps the organization flow programming code. We chosen 5 sensor for the measurement of the parameters most common in a weather station: DHT22 ( humidity and temperature ) , BMP180 (pressure and temperature) , DS18B20 ( water temperature ) , anemometer ( wind speed ) and wind vane ( direction of the wind ) . For system power supply we will use a one battery recharged by a solar panel. The communication between the weather station and the PC will be via bluetooth technology and the graphical interface data reception is created with LabView. The project will be implemented in small phases fully functional, one for each sensor, performing simulations with Proteus tool and real tests of the sensors with the development board DM240313 equipped with PIC18F87K22 microcontroller. Upon completion of all phases, they will be unified in a common project by adding a wireless connection, implementing the low power mode of the microcontroller and creating a graphical monitoring interface with LabView.