They actually do have mechanisms for predicting the magnetic strength as measured by sunspots for the next one or two cycles. NASA itself has preducted the next cycle soon to start will be very weak. They use the speed of currents in the suns plasma. The currents travel along the surface and then down deeper. Similar to how ocean currents on Earth behave. What they got wrong was the cycle just ending. We have now had three cycles in a row with decreasing activity. And the next is supposed to be even weaker. This winter will probably rival the worse any of us have experienced. Temperatures will drop to levels seldom encountered. Snow will also be significant. Atlas is shrugging the hairless apes off again. Last time we dropped to 100,000 worldwide apparently.
If so, we shall soon have global cooling
Something like a lot of sunspots result in high solar winds resulting in more capture of cosmic ray particles resulting in less seeding for clouds resulting in thinner and fewer clouds. Therefore more solar radiation is let in and the earth gets warmer.
We should expect cloudier weather, then, as sunspot activity fades. Which in turn would result in colder weather. And, much snowfall. I’m dreaming of a white Christmas....