I ordered a Pi 3 and accessory kit here from Amazon, it comes with 2 heat sinks. I won't be overclocking the Pi, would I still need to worry about heat issues? Eventually, this will be in an enclosed area outside of the casing with plenty of air circulation.
No a heatsink is not required, The Pi3 has been reported to generate more heat than previous models, but the heatsink is not required. You can install it for some extra thermal protection, but the Pi will throttle the clock speed to maintain a safe temperature. Heatsinks are included in many of these kits to increase the perceived value.
No heatsink is required, but this does not prevent you from adding one. If your operating environment can get a bit warm and you don't want it to thermal throttle, you can add one (optionally strap a fan on it.)
I have all my Pi heatsinked since I use cases while put lots of stress on the core, and one of them have a fan strapped on it to improve cooling as it operates in a warm equipment roon with an average ambient temperature of 45ºC.
As the answers state, no heatsinks are required.
However, following on from Snowman's comment to Maxthon Chan's answer, and taking some examples from the Raspberry Pi site1, should you want to check/measure the temperature that your Pi is running at, you can use the command:
Should you find yourself using this command frequently, you may wish for a shortcut. To do this, you could use an alias, such as
and add the following line
In case of error
Note that, should you be running an older version of Raspbian, and encounter the error:
then you should run
and the alias would become
Run the following command, which gives the answer in millidegrees Centigrade, and divide by 1000 to get °C:
Bash script for CPU and GPU temperatures
1 All examples taken from Show RPI's Temperature with a command