Yes, there can be limits to how much weight an Adjustable Plastic Pedestal can safely support in extreme weather conditions. Extreme weather conditions such as heavy rainfall, high winds, or freezing temperatures can cause additional stress on the pedestal.
According to the specifications provided by Elevated Deck Systems, their JQ-T1 Adjustable Pedestal supports a weight bearing capacity of 3306 lbf (1500 kg) per pedestal. However, in adverse weather conditions, the pedestal's performance could be reduced. For instance, heavy rainfall or snowfall could add extra weight to the pedestal, potentially causing it to collapse if the weight exceeds the pedestal's capacity.
Similarly, high winds could exert a significant force on the pedestal, potentially causing it to move or collapse. This is especially true for pedestals that are located near windows or other areas that are susceptible to wind damage.
In general, it's important to take into account the local climate and weather conditions when selecting and installing an Adjustable Plastic Pedestal. It's also recommended to regularly inspect the pedestal for any signs of damage or wear, and replace it if necessary.