This is the free app (for weather): S6 Digital Thermometer.

This is a digital thermometer designed for the Galaxy S6.
It uses the Galaxy sensors to sample the temperature and update the display.

The digital thermometer displays the ambient temperature in celsius or fahrenheit.

Although designed for the Galaxy S6 sensors, it should work fine on following phones:
Galaxy S6 Edge
Galaxy S5
Galaxy S4
Galaxy S3
Galaxy Note 3
Galaxy Note 4
HTC One
LG G3
LG G4
Nexus 6
Sony Xperia


Enjoy!