DS18B20 Temperature Sensor Module, is highly suitable for Raspberry PI with digital IO connection.

The 3-wire digital temperature sensor is fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter. It work's great with any microcontroller using a single digital pin, and you can even connect multiple ones to the same pin, each one has a unique 64-bit ID burned in at the factory to differentiate them. Usable with 3.0-5.0V systems.

Specifications

Usable temperature range: -5° to 90°C (-23°F to +194°F)

9 to 12 bit selectable resolution

Uses 1-Wire interface- requires only one digital pin for communication

Unique 64 bit ID burned into chip

Multiple sensors can share one pin

±0.5°C Accuracy from -10°C to +85°C

Temperature-limit alarm system

Query time is less than 750ms

Usable with 3.0V to 5.5V power/data