MCP9808 High Accuracy I2C Temperature Sensor Breakout Board

This I2C digital temperature sensor is one of the more accurate/precise we've ever seen, with a typical accuracy of ±0.25°C over the sensor's -40°C to +125°C range and precision of +0.0625°C.
They work great with any microcontroller using standard i2c. There are 3 address pins so you can connect up to 8 to a single I2C bus without address collisions. Best of all, a wide voltage range makes it usable with 2.7V to 5.5V logic!
Unlike the DS18B20, this sensor does not come in through-hole package so Adafruit placed this small sensor on a breakout board PCB for easy use. The PCB includes mounting holes, and pull down resistors for the 3 address pins. Adafruit even wrote a lovely little tutorial and library that will work with Arduino or CircuitPython. You'll be up and running in 15 minutes or less.
Some quick specs:

Simple I2C control
Up to 8 on a single I2C bus with adjustable address pins
0.25°C typical precision over -40°C to 125°C range (0.5°C guaranteed max from -20°C to 100°C)
0.0625°C resolution
2.7V to 5.5V power and logic voltage range
Operating Current: 200 ?A (typical)

TECHNICAL DETAILS
Technical specs:

Sensing Temperature: -40ºC ~ 125ºC
Accuracy: 0.25ºC typical
Voltage - Supply: 2.7V ~ 5.5V
Operating Temperature: -40ºC ~ 125ºC
Uses any I2C address from 0x18 thru 0x1F
Datasheets, Fritzing object, PCB CAD files and more in the tutorial

Dimensions:

21mm x 13mm x 2mm / 0.8" x 0.5" x 0.08"
Weight: 0.9g