September is usually the worst month for stocks. Many investors either reap their summer profits or dump their losers to harvest tax losses, while fund managers follow the same trends to clean up their portfolios.

This September could be even tougher because we're in the midst of a bear market with rising interest rates. However, I believe investors can survive this challenging month by sticking with high-yielding blue-chip tech stocks that are trading at bargain-bin valuations. These three stocks fit the bill: AT&T (NYSE: T), Cisco Systems (NASDAQ: CSCO), and HP (NYSE: HPQ). Let's find out a bit more about them.

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Source Fool.com