SparkFun Humidity Sensor Breakout - SHTC3 (Qwiic) Hookup Guide
El Duderino 
Hardware Assembly
Using the Qwiic system, assembling the hardware is simple. All you need to do is connect your SparkFun Humidity Sensor Breakout - SHTC3 (Qwiic) to your chosen development board with a Qwiic cable or adapter cable. Otherwise, you can use the I2C pins broken out if you prefer. If you are not using a Qwiic-enabled board, make sure your input voltage and logic are either running at 3.3V or you are running both controller and SHTC3 at the same logic level.
If you prefer to use the PTH pins broken out on the Humidity Sensor you will need to either solder to them or, if you want a temporary connection for prototyping, these IC Hooks are a perfect option to make that connection. If you are not familiar with through-hole soldering, take a look at this tutorial:
How to Solder: Through-Hole Soldering
September 19, 2013
With our SHTC3 connected to our microcontroller we can move on to writing some code to start monitoring temperature and humidity.