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!

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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