95 SL Auto Transmission Shifting Delay

[89HatchbackLxi]

Ok, so for the past few months I've noticed my car has started developing a weird delay or sudden quick jump with shifting, -this isn't bad enough to cause the car to be a road hazard or anything, but it's very very irritating when it occurs.

The weird part is, the car only does this once the engine is fully warm or if its a warmer day outside. (like 75+ F outside) (I determined this because it never seems to happen in the morning on my way to work, but it does sometimes happen on my way home from work). So, living in CA, the car has started doing this more now that it's getting warmer outside. What the heck could be causing this? Is there some kind of temperature sensor related to my transmission shifting that could be going bad?

The transmission is perfectly fine when it's not warm out, or when the engine is not yet fully warmed up, so I don't think the transmission itself is going bad. It's got to be something temperature related.... I just can't figure out what it is since I have little mechanical background, and I don't want to take it to a transmission shop until I have an idea what it could be, cause they'd have to keep the car for a day or two to run some tests on it.