The measurements of various weather parameters temperature, atmospheric pressure and relative humidity locally by using the appropriate sensors is not only important in environmental or weather monitoring but also crucial for many Industries, including energy, agriculture, forestry, power generation, utilities, mining, petrochemicals and tourism, as well as urban growth and transportation each have the potential to affect air, land, water and biodiversity. The potential environmental impacts of these activities must all be measured, evaluated and managed. All these monitoring efforts undertake responsibility to provide knowledge and information for policy-makers and public concerning global environmental issues over the long-term. A device for weather monitoring has been developed as described in this paper to monitor and display the temperature, pressure and relative humidity of the atmosphere, using analogue and digital components. The analogue outputs of the sensors are connected to a microcontroller through an ADC for digital signal conversion and data logging. For analysis and archiving purposes, the data can be transferred to a PC with a graphical user interface program, through a USB link. The interface program allows sampling parameters such as the date and time of the data-logging operation to be configured. The device has many advantages as compared to other weather monitoring systems in terms of its smaller size, huge memory capacities, lower cost and greater portability.