Is sunshiny shower won't last half an hour true?

The phrase "sunshiny shower won't last half an hour" suggests that brief periods of sunshine followed by rain are typically short-lived. This can often be true, as such weather patterns can occur quickly and may not last long. However, the duration of any weather phenomenon can vary greatly depending on specific conditions, so it isn't universally accurate. Ultimately, the saying captures a common observation rather than a strict rule.