A pair of Arduino sketches that illustrate using an ESP8266 development board along with a thermistor to build a wireless temperature sensor.
The basic sketch just measures the temperature and logs it to the serial console so you can calibrate the thermistor accurately.
The wifi sketch extends this to submit the data over WiFi to an InfluxDB instance, which you can then query using Grafana. If you have InfluxDB exposed so that you can talk to it using standard authentication, you can simply set the constants at the top of the file and you're ready to go.
If you have a non-ESP8266 board, you can use the basic version by just changing the analog pin, but you'll need to swap out the WiFi library in the wifi version for one supported by your platform/shield.