Best way to pack for a trip when you have no idea what the weather will actually be like?

Title: How to Pack Efficiently for Unpredictable Weather in Your Travel Destination

Travelers often face destinations with a reputation for weather that’s hard to predict. The challenge: avoid overpacking while staying warm and dry, even when forecasts are uncertain. Is there a reliable approach or “traveler hack” that helps balance preparedness with light luggage? What strategies do experienced travelers use to pack effectively when the forecast isn’t clear?