Why RSI Is Not Necessarily Predictive

The Relative Strength Index is one of the most widely used technical indicators in financial markets.

But RSI does not directly predict future prices. Instead, it summarizes the magnitude of recent gains and losses over a chosen lookback period.

That distinction matters. A high RSI indicates that recent upward price movements have been relatively strong, but it does not necessarily imply that prices must reverse.

Momentum can persist for long periods, particularly during strong trends. This means RSI is often more useful as a description of market conditions than as a standalone forecasting tool.

The more interesting question is therefore not whether RSI is predictive by itself, but whether it contains incremental information when combined with market regime, volatility, valuation, or other signals.