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This paper investigates the performance of multi-hop Free Space Optical (FSO) communications using serial Decode-and-Forward (DF) relay transmissions. A statistical model for the optical intensity fluctuation at the receiver due to the combined effects of atmospheric turbulence-induced fading, misalignment fading and pass-loss is presented. Under given weather and misalignment conditions, a closed-form analytical expression for the end-to-end outage probability of serial Decode-and-Forward (DF) multi-hop FSO communications is derived. Numerical results show that the serial DF multi-hop transmission is a promising technology to enhance the performance of FSO communications. Moreover, the derived analytical expression can provide close approximations to the simulation results.