2025 El Nino Or La Nina Weather Forecast. La niña conditions are expected to emerge this winter, bringing potential weather shifts for ski enthusiasts. With the influence of recurring el niño and la niña cycles, global surface temperatures are expected to surpass previous records.

Overall conditions in the atmosphere and ocean, however, indicate that common features of past la niña events were becoming clear. La niña begins when pacific trade winds strengthen, pushing warm surface waters westward and allowing cooler water to rise in the eastern pacific.