Okay, I have figured out how to do this with AppleScript. I also format it by converting to Fahrenheit and round down to two decimal places:
tell application "JSON Helper"
set result to (fetch JSON from "http://192.168.4.32/api/[API_KEY_HERE]/sensors/18/")
tell state of result
set officeTemp to its temperature
set officeTempF to (officeTemp / 100 * 9 / 5 + 32)
end tell
end tell
round_truncate(officeTempF, 2)