Today, the weather has been pretty balmy in Gainesville. Once you walk out the door, it hits you like a ton of bricks. Unfortunately, it looks as if it will stick around for Sunday. The strong ridge that is to our west is expected to remain. Currently, there is a weak trough running through the state from the north according to the latest forecast discussion from NWS-JAX. However, it appears that it might not be enough to break the CAP and spawn some showers and storms due to lack of low-level convergence or lift. The discussion stated that there could be some cooling aloft (which could help spawn rain/storms), but chances still seem low for any precipitation. So, expect the high temperatures to remain thanks in part to the sinking air from the ridge.
For tonight, expect very warm and humid night with partly cloudy skies. I'm calling for a low near 76. For Sunday, expect much of the same today with partly cloudy skies with a very slim chance of storms. I'm calling for a high of 100.
The record high for Sunday was 100 degrees and was set in 1998 (that was the summer when Florida had extreme drought and wildfires). We might get close, approach it or barely exceed the century mark. High dewpoints will factor in to the temperature and increase the heat index, which could get as high as 109 degrees according to the NWS.
If you plan to be outside, drink plenty of water, wear light clothing and take frequent breaks. Statistically, most weather deaths are due to heat (Source: The Weather Channel).