How Predictable Is Weather?

The Short Answer: A seven-day forecast can accurately predict the weather about 80 percent of the time and a five-day forecast can accurately predict the weather approximately 90 percent of the time. However, a 10-day—or longer—forecast is only right about half the time.

How accurate is weather 3 days?

Indeed, the forecast services are around 80% accurate for the first three days and tail off to just under 70% by day nine, and for all days, the forecasts are better than persistence. ... Professional service providers on average provide much more skillful forecasts than persistence.

Is weather predictable or unpredictable?

Meteorologists have the job of predicting changes in weather, but there are a lot of factors that affect weather: temperature, air pressure, cloud patterns, precipitation, and wind factors including its speed, direction, and moisture level.