Hello,
The past weekend, the temps in Georgia hit the upper 70s and
the second floor of our 2-floor home was about 10 degrees
warmer than the first floor.

Also, the attic (which houses the central a/c and heater) was
extremely hot, lower 90s or so.

My question is: is this temp increase in the 2nd floor and attic
normal? This is 2-story house with central A/C and heat - wooden
w/ front brick.

Also, are reasonable means to cool down the attic?

There is an attic fan that was installed by the previous owner, but it
kicks in
around 95 F or so. Even then, not sure if it can cool down such a hot
attic.