The Analog Devices ADT7410 is an I2C temperature sensor, with 16-bit 0.0078°C temperature resolution and 0.5°C temperature tolerance.
The ADT7410 has 2 address pins, so you can have up to 4 sensors on one I2C bus. There's also interrupt and critical-temperature alert pins. The sensor is good from 2.7V to 5.5V power and logic, for easy integration.
Adafruit has got both Arduino (C/C++) and CircuitPython (Python 3) libraries available.
More information can be found on the website of Adafruit.