The fan speeds are much higher than normal

When I woke up today and turned on my Macbook Air (2014, 13 inch, OS Yosemite 10.10.4), the fans immediately turned on, and stayed on until I put the laptop to sleep or turned it off. It stays at a constant 6500 RPM at around 95ºF, with no applications running.

In activity monitor, kernel_task is using over 400% CPU, but this seems like it's only because of the fan. When I put the MBA to sleep with activity monitor opened, and then awaken it a little after, kernel_task only uses 10-20% of the CPU with no fan running, but 10 seconds later, the fan is back at 6500 RPM with kernel_task using a couple hundred % of the CPU.

Anyone know what's wrong? Already rebooted multiple times as well as resetting the SMC and PRAM.