Agriculture is the sector most seriously affected by climate change. Some elements of climate include rainfall patterns, drought, air temperature, which causes floods and drought. Greenhouse technology or house plants is an alternative solution to control climate conditions in plants. Many physical and digital technologies are combined through analytics, artificial intelligence, cognitive technology and the Internet of Things (IoT) to create an interconnected ecosystem and are able to produce more informed decisions. IoT is influential in a variety of industries such as manufacturing, logistics, health, urban planning, housing, even in agriculture. One IoT that can be applied in agriculture is to create a monitoring and automation system for controlling soil moisture, air humidity and air temperature in web-based tomato plants. Monitoring is carried out on web-based applications. Whereas what is controlled automatically is watering the plants. In making the tool will use DHT22 which is used for temperature and humidity sensors which can later be monitored via the web, The research method used (Research And Development) R&D. This methodology consists of three stages, starting from the needs analysis, development, testing. The system can do automatic watering when soil moisture conditions <60% and stop watering at soil humidity> 80% all function well in running the pumping machine so that plants can be watered and there are differences in plants by using an automatic system