 This study proposes a solar-powered wireless sensor system to monitor the physical parameters of an ambient environment, in real-time. The system is comprised of two sensors and a NodeMCU board, which includes a microcontroller with a Wi-Fi chip. It measures ambient temperature, relative humidity, atmospheric pressure, and ultraviolet, UV, index. A solar energy harvester provides power from direct sunlight, while a DC-DC converter and rechargeable battery provide backup power. The system consumes an average of 40 mW per hour and has a lifetime of 123 hours, in the active sleep mode. The results show that the system can be used to monitor environmental data in harmful environments. This article was authored by Saeed Maasan.